The AD is built around a small set of regulatory mechanisms: AFM mandatory changes, placarding, and parts‑installation controls tied to specified manufacturer service bulletins. The principal concepts are:

• Mandatory AFM modification: The AD mandates AFM Limitations revisions (Requirement 2). Operators must incorporate either Annex A or Annex B into the AFM. The AD expressly allows incorporation by inserting a copy of the applicable Annex into the AFM (Requirement 2). The AD also requires removal of the AFM revision imposed by AD/B747/279 Amdt 1 (Requirement 1), which creates a direct sequence of AFM changes between ADs.
• Supersession of basic AFM limitations: The AD contains an explicit displacement rule: “The limitations contained in the Annexes to this Directive supersede any conflicting basic AFM limitations.” That language, repeated in the document, means the Annex provisions take precedence over conflicting material in the operator’s baseline AFM.
• Cockpit placards: For situational awareness and operational compliance, placards with precise wording must be installed adjacent to specific crew displays or panels depending on model (Requirement 3). Exact quoted texts are part of the AD: e.g. “AD/B747/280 fuel usage restrictions required.” and for certain models “Use of horizontal stabilizer tank is prohibited.” Placards are placed either on or adjacent to the flight engineer’s fuel control panel or adjacent to each pilot’s primary flight display (PFD), depending on model group (Requirement 3).
• Parts installation restriction tied to inspection to service bulletin: The AD conditions future installation of certain fuel pumps on an aeroplane on proof of an inspection ensuring correct wire‑bundle routing since the latest assembly of the end cap and motor‑impeller housing. The required inspection procedures are those in Boeing ASB 747‑28A2248 dated 23 September 2002 or Crane Hydro‑Aire SB Motor‑Impeller‑28‑01 (including Appendix A) dated 17 September 2002 (Requirement 4). The AD as supplied mentions affected pump part numbers but does not include the P/N list in this extract.
• Operational limitations specifying fuel quantities and pump‑switching logic (in Annex A): For a subset of models (Model 747‑100, ‑200B, ‑200F, ‑200C, ‑100B, ‑300, ‑100B SUD, 747SR, and 747SP), Annex A prescribes specific prohibitions (centre auxiliary tanks and certain auxiliary tanks prohibited), minimum and switch‑off fuel quantities for the centre wing tank (CWT), requirements for CWT fuel quantity indication system operability to dispatch, and operational warnings (e.g. do not reset a tripped fuel pump circuit breaker; do not cycle CWT pump switches ON‑OFF‑ON with continuous low pressure indication) as well as notes about when jettisoning and low fuel situations allow different use of CWT pumps. Annex A also contains an explicit temporary allowance concerning zero fuel gross weight: if main tanks are not full, the zero fuel gross weight plus CWT fuel may exceed the maximum zero fuel gross weight by up to 7,000 pounds for the phases of flight listed, provided balance (centre of gravity) effects are considered.

Conceptually, the AD uses AFM text changes and cockpit placarding to change crew behaviour, and uses a parts‑installation prohibition tied to inspection to address a manufacturing or assembly risk in installed pumps. The AD references earlier AD/B747/279 and specified manufacturer service bulletins as the operative technical instructions; therefore compliance requires cross‑referencing those external documents (the AD text supplies the ASB/SB dates and identifiers but not the full content of the service documents nor, in this extract, the P/N list).

The AD’s applicability clause is broad and explicit: “All model 747 series aeroplanes.” That language places the AD squarely on the operators, owners, certificated maintenance organisations and maintenance personnel associated with Boeing 747 family aeroplanes in the Australian registry (and effectively on operators who choose to operate in jurisdictions that will enforce CASA ADs). The specific affected parties and their obligations under the AD include:

• Aircraft operators/aircraft operators’ flight crews: Must operate aeroplanes in accordance with the revised AFM Limitations after incorporating the applicable Annex (Requirement 2). Crew must also observe placards installed per Requirement 3, and implement fuel management and pump‑switching procedures required by Annex A for the listed model group. The AFM limitations include explicit operational constraints (for example, prohibitions on use of the centre auxiliary fuel tank and other auxiliary tanks where stated, minimum CWT quantities before engine start if certain pumps are to be selected ON, switch‑off thresholds for CWT override/jettison pumps, and warnings about circuit breaker reset and pump switch cycling). These impose immediate operational decisions on flight crews and dispatch planning teams.
• Maintenance organisations and maintenance personnel: Responsible for removing the prior AFM revision required by AD/B747/279 Amdt 1 (Requirement 1) and incorporating the new Annex material into the AFM (Requirement 2). Maintenance shops and parts managers must ensure that when replacing fuel pumps they do not install the prohibited P/Ns unless an inspection documenting correct wire‑bundle routing “since the most recent assembly of the end cap and motor‑impeller housing” has been completed in accordance with the specified Boeing or Crane service bulletins (Requirement 4). Maintenance records must therefore record the inspection and its conclusion if a pump is fitted that otherwise would be a prohibited P/N.
• Aircraft owners/registrants: Financial responsibility for compliance actions rests with owners/registrants. Compliance steps include AFM revisions, placard procurement and installation, any inspections required by the ASB/SB, and any remedial work identified by those inspections. Owners must also ensure that an aeroplane is dispatched only when the CWT fuel quantity indication system is operative if dispatch with CWT mission fuel is intended (Annex A).
• Certificate holders/manufacturers of replacement parts: Where a pump with an affected P/N is supplied as a replacement, the AD conditions installation on the aeroplane on evidence of prior inspection per the cited ASB/SB. Suppliers and overhaul facilities will therefore need to provide traceable documentation of the inspection and correct routing since the latest assembly, or perform the inspection prior to supplying the pump for installation.
• Regulatory oversight and CASA: The CASA delegate issues the AD under CAR 1998 subregulation 39.1(1) and sets the AD’s mandatory terms. Enforcement, compliance monitoring and any action for noncompliance would proceed under CASA’s regulatory remit, though the AD text supplied contains no enforcement or penalty clauses within the extract.

Practical distributional effects: the AD’s requirements concentrate inspection and documentation burdens on maintenance organisations and owners, while operational constraints and monitoring burdens fall on operators and flight crews. The AD refers to specific model groups for certain placarding and AFM Annexes; however, the applicability clause is universal across the 747 family, making it necessary for all 747 operators to determine the correct Annex (A or B) applicable to their aircraft and to confirm whether affected P/Ns are relevant for their maintenance inventories.

The AD creates several mandatory duties on operators and maintainers; it does not enumerate enforcement rights or penalties in the provided extract, but it is issued under subregulation 39.1(1) of CAR 1998 and therefore operates as a mandatory airworthiness requirement. Key duties and operational commands in the AD are as follows:

Mandatory duties

• Remove the AFM revision required by AD/B747/279 Amdt 1 (Requirement 1). This places an affirmative obligation on the operator or entity responsible for AFM content to delete a prior AD‑specified AFM revision.
• Revise the AFM Limitations Section by incorporating Annex A or Annex B (Requirement 2), and do so “in accordance with the instructions set out in the requirement section” and “at the time mentioned in the compliance section” per the AD’s opening paragraph. The AD explicitly allows incorporation by inserting a copy of the applicable Annex into the AFM (Requirement 2).
• Ensure the Annex limitations supersede any conflicting basic AFM limitations. This imposes a duty to treat the Annex text as the operative limitations where conflict exists.
• Install placards per Requirement 3, with specified wording and location depending on model group. For example:
  • For Model 747‑100, ‑200B, ‑200F, ‑200C, ‑100B, ‑300, ‑100B SUD, 747SR, and 747SP series , install a placard on or adjacent to the flight engineer’s fuel control panel stating: “AD/B747/280 fuel usage restrictions required.” (Requirement 3a).
  • For Model 747‑400 series , install a placard on or adjacent to each pilot’s primary flight display (PFD) stating: “AD/B747/280 fuel usage restrictions required.” (Requirement 3b).
  • For Model 747‑400, ‑400D, and ‑400F series aeroplanes on which a horizontal stabilizer tank is installed , install a placard adjacent to each pilot’s PFD stating: “Use of horizontal stabilizer tank is prohibited.” (Requirement 3c).
• Comply with Annex A operational limitations where Annex A is applicable (e.g. prohibitions on centre auxiliary and auxiliary tanks 1 and 4; minimum CWT fuel prior to engine start when CWT override/jettison pumps will be ON; mandatory CWT quantity indication operability for dispatch with CWT mission fuel; specific pump switch OFF thresholds at given quantities; warnings about not resetting tripped fuel pump circuit breakers; warnings about not cycling CWT pump switches with continuous low pressure indication; notes regarding jettison and low fuel exceptions; shutdown of failed centre wing tank pump when fuel remains in the centre tank; and the temporary allowance that zero fuel gross weight plus CWT fuel may exceed maximum zero fuel gross weight by up to 7,000 pounds if main tanks are not full, provided balance/CG is considered).
• Do not install certain fuel pumps as replacement parts unless inspected per Boeing ASB 747‑28A2248 dated 23 September 2002 or Crane Hydro‑Aire SB Motor‑Impeller‑28‑01 dated 17 September 2002, including Appendix A (Requirement 4). The AD text as presented anticipates a P/N list, but the P/Ns are not included in the supplied extract.

Operational directives in Annex A (selected excerpted duties):

• The CWT must contain a minimum of 17,000 pounds of fuel prior to engine start if the CWT override/jettison pumps will be selected ON during flight.
• Both CWT override/jettison pump switches must be selected OFF at or before CWT fuel quantity reaches 7,000 pounds if CWT fuel is less than 50,000 pounds prior to engine start; they may be selected ON during stabilized cruise, but must be OFF at or before 3,000 pounds.
• If the CWT fuel quantity is ≥ 50,000 pounds prior to engine start, both overrides must be selected OFF at or before 3,000 pounds.
• Both CWT override/jettison pumps must be turned OFF when either CWT override/jettison fuel pump low pressure light illuminates.
• Do not reset a tripped fuel pump circuit breaker.
• Do not cycle CWT pump switches from ON to OFF to ON with any continuous low pressure indication present.
• In an emergency, the CWT may be emptied by normal jettison procedures; in low fuel situations, both CWT override/jettison pumps may be selected ON and all CWT fuel may be used.
• If a centre wing tank pump fails with fuel in the centre tank, shut off the affected pump.
• Where main tanks are not full, an allowance permits zero fuel gross weight plus CWT fuel to exceed the maximum zero fuel gross weight by up to 7,000 pounds for specified flight phases, provided balance effects are considered.

Rights and obligations implicit in the AD text

• The AD allows operators a limited choice: incorporate Annex A or Annex B depending on model applicability (Requirement 2). The operator’s duty is to determine the correct Annex for the model and to incorporate it.
• Installation of pumps with the named P/Ns is restricted unless inspected; maintenance organisations have the right to inspect per the specified ASB/SB and then fit the pump if the inspection demonstrates proper wiring since the last relevant assembly (Requirement 4). The AD thereby conditions installation, rather than absolutely banning the parts irrespective of proof of inspection.
• The AD does not, in the supplied extract, state administrative appeal or review mechanisms; it is silent on penalties in this text. The issuance under subregulation 39.1(1) indicates a statutory basis for the AD but does not itself enumerate enforcement mechanism or sanctions in the extracted material.

The supplied AD text establishes the AD as a regulatory instrument issued under subregulation 39.1(1) of CAR 1998: “For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998.” This identifies the statutory source of the delegate’s power to issue the AD. The AD directs that actions “be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.” That phrasing is mandatory in tone and establishes that compliance timing and circumstances are integral parts of the AD.

What the AD extract does not contain

• The provided text does not include any specific penalty provisions, monetary fines or criminal sanctions attached to noncompliance within the extract. It likewise does not include administrative enforcement procedures or detail the mechanisms CASA would apply (for example, grounding notices, suspension of an operator’s AOC, issue of defect notices or civil penalties) in the event of noncompliance. Those enforcement mechanisms usually derive from the broader statutory and regulatory framework under CAR 1998 and CASA’s enforcement policies rather than from the text of the AD itself; however, within this extract there is no specific statement of penalties.
• The compliance section that specifies timing (the extract references compliance timing in the opening paragraph) is not present in the provided copy. Consequently, the precise deadlines for AFM removal, AFM revision incorporation, placard installation and pump inspection or prohibition are not available from this extract alone. Enforcement action will hinge on those compliance dates; they must be located in the complete AD text.

Practical enforcement implications grounded in the AD text

• The AD is framed as mandatory under CAR 1998 subregulation 39.1(1) and requires operators and maintainers to take defined actions (AFM changes, placarding, inspections) and thus places obligations enforceable under CASA’s regulatory remit. The lack of explicit penalty language in the extract does not alter the AD’s mandatory character; CASA’s statutory powers under CAR 1998 supply the enforcement backdrop.
• Because the AD conditions replacement pump installations on inspections complying with named ASB/SB documents, enforcement will likely focus on maintenance records and evidence that any installed pumps either are not in the prohibited P/N list or have inspection documentation consistent with the ASB/SB requirements.
• The AD’s operational limitations in Annex A (for the applicable models) introduce dispatch and operating conditions (for example, CWT quantity and pump switch procedures) that inspectors can check against AFM content, placard presence and crew procedures. The AD explicitly requires CWT fuel quantity indication system operability to dispatch with CWT mission fuel; failure to meet that condition creates a clear non‑compliance point.

In summary, the AD is a mandatory CASA instrument under CAR 1998 subregulation 39.1(1), but the provided extract omits the compliance timing and any penalties. Enforcement will therefore rest on the statutory enforcement powers in CAR and CASA practice, with documentary evidence (AFM content, placard presence, maintenance inspection records) expected to be the primary means by which compliance is verified.

The AD explicitly situates itself in the regulatory cascade and references other regulatory and technical instruments. Interactions evident in the supplied text include:

• CAR 1998 (subregulation 39.1(1)): The AD is issued under that subregulation, which is the statutory basis for the CASA delegate’s power to issue airworthiness directives. The AD therefore functions as a subordinate regulatory instrument operating within the CAR 1998 regime (opening paragraph).
• Prior ADs: The AD requires removal of an AFM revision required by AD/B747/279 Amdt 1 (Requirement 1). That creates an interaction and sequencing effect between AD/B747/279 and this AD/B747/280: the earlier AD’s AFM change must be reversed by the present AD, indicating that AD/B747/280 supersedes or modifies operational requirements previously imposed by AD/B747/279. The AD’s instruction to remove earlier AFM content creates an explicit amendment link between ADs that operators must follow.
• Manufacturer service bulletins: The AD makes compliance conditional on the inspection procedures contained in Boeing Alert Service Bulletin 747‑28A2248 dated 23 September 2002 or Crane Hydro‑Aire Service Bulletin Motor‑Impeller‑28‑01 (including Appendix A) dated 17 September 2002 (Requirement 4). Those service bulletins are manufacturer technical documents that are typically advisory unless mandated by an AD. Here, the AD makes the SB/ASB mandatory for the specific purpose of validating pump wiring routing prior to installing certain pumps. This is an example of an AD converting manufacturer technical guidance into binding compliance requirements.
• AFM and basic AFM limitations: The AD expressly states that the Annex limitations “supersede any conflicting basic AFM limitations.” That is a direct interaction with the operator’s basic AFM, which normally contains limitations arising from type certification, design requirements and other ADs or operational approvals. The AD therefore overrides conflicting AFM content and requires operators to treat the Annex as the controlling limitations text where conflict exists.
• Model‑specific equipment or configuration approvals: The AD’s placarding and Annex‑selection regime interacts with aircraft configuration approvals. For example, the placard “Use of horizontal stabilizer tank is prohibited” is only required for Model 747‑400, ‑400D and ‑400F aeroplanes on which a horizontal stabilizer tank is installed (Requirement 3c). That creates an intersection between this AD and any STC, design approval or supplemental type approvals that authorised the horizontal stabilizer tank installation; operators must implement the placard if that configuration exists.
• Operational and weight‑and‑balance regimes: Annex A contains an explicit allowance that the zero fuel gross weight plus the weight of CWT fuel may exceed the maximum zero fuel gross weight by up to 7,000 pounds for certain flight phases, “provided that the effects of balance (CG) have been considered.” This instruction interacts with an aircraft’s weight and balance requirements and operational dispatch processes; it provides a specific scenario where the AFM limitations permit a departure from the baseline maximum zero fuel gross weight, conditional on CG considerations. That conditional permission would need to be reconciled with the operator’s weight and balance control processes and any related certification constraints.
• Serviceability and dispatch requirements: Annex A states that “The CWT fuel quantity indication system must be operative to dispatch with CWT mission fuel.” This is an interaction with the regulatory requirement that an aircraft be in an airworthy condition and meet dispatch requirements; where the CWT mission fuel is to be used, the operability of that indication system becomes a dispatch precondition.
• Records and maintenance documentation: By conditioning installation of pumps on inspections performed per the specified ASB/SB, the AD interacts with maintenance recordkeeping obligations. Maintenance organisations must maintain evidence that the inspection has been completed and that the pump, if fitted, had correct wire‑bundle routing since the last relevant assembly. This also interacts with obligations to document compliance with ADs and to retain maintenance records.

Absent or uncertain interactions in the extract

• The compliance section and P/N list are not included in the supplied text. Those missing elements would clarify which specific pumps are affected and the timeframes for compliance. Without them, the practical interaction with maintenance shops’ inventories and planned replacement cycles is unclear from this extract alone.
• The AD does not include express mention of how the AD interacts with operator exemptions, alternative method of compliance (AMOC) processes, or appeal/review mechanisms in this extract. Those mechanisms, if available, would typically be set out elsewhere in CASA policy or the full AD text and the CAR regime.

In short, the AD cross‑references prior ADs, specific manufacturer service bulletins, AFM material and configuration approvals. It makes technical service guidance mandatory for certain parts‑installation actions and supersedes conflicting AFM limitations. Operators must therefore coordinate AFM content, maintenance activities and dispatch practices to ensure alignment across these instruments.

The supplied extract provides limited but concrete signals about amendment sequencing and dates:

• AD identifier and date shorthand: The AD is titled “AD/B747/280 Fuel Tank Pumps 12/2002 TX.” The “12/2002” and “TX” tokens indicate a December 2002 issuance identifier in the AD numbering convention used here, though the extract does not supply an explicit signature date beyond that label.
• Reference to a predecessor AD: The AD requires removal of an AFM revision required by AD/B747/279 Amdt 1 (Requirement 1). That references an immediately prior AD in the same numbering sequence, indicating that AD/B747/279 had previously required an AFM revision that must now be removed. The AD therefore amends, replaces or reverses at least part of AD/B747/279’s AFM requirements by direct instruction.
• Manufacturer service bulletin dates: The AD mandates inspections per Boeing ASB 747‑28A2248 dated 23 September 2002 and Crane Hydro‑Aire Service Bulletin Motor‑Impeller‑28‑01 (including Appendix A) dated 17 September 2002 (Requirement 4). These dates place the technical inspection instructions in September 2002. The AD’s December 2002 identifier suggests the AD followed the service bulletins by a short interval and made those procedures mandatory via the AD.
• Annex‑driven changes: The AD creates new operative AFM limitations by directing incorporation of Annex A or Annex B into the AFM (Requirement 2). The AD therefore constitutes an amendment to AFM content for the 747 fleet affected. Annex A contains detailed operational limitations for the specified legacy 747 models; Annex B is referenced for the 747‑400 family, but in the supplied extract the Annex B body text is effectively absent beyond headings and the label “Certificate Limitations.” The extract therefore indicates an intended new AFM content for both Annexes but only supplies Annex A’s substantive text for the older models in the extract.
• Duplication/formatting in the extract: The provided copy contains repeated headings and textual duplication (for example multiple repetitions of “AD/B747/280” and “Annex A”/“Annex B”). While this appears to be an artefact of the supplied reproduction, it indicates that the AD as promulgated referenced both Annexes and that its amendment effect is focused on AFM limits and placard/parts‑installation instructions.

What the extract does not show

• The extract does not include a formal “Amendments” log showing prior amendment dates to the AD itself subsequent to issuance, or any later supersessions. No later AD numbers or amendment entries are included.
• The extract does not include the compliance section that would specify effective dates and compliance windows. Absent the precise compliance windows, the timing of the AD’s required actions relative to the issuance date cannot be ascertained from this extract alone.
• The extract does not include the list of part numbers affected by the pump installation prohibition. That P/N list would materially affect the amendment impact on parts inventories and overhaul practices.

Operators and maintainers should treat the supplied extract as showing an AD that (a) supersedes prior AFM instructions from AD/B747/279 as to AFM content; (b) mandates AFM changes via Annex incorporation; and (c) makes specific manufacturer service bulletin inspection procedures mandatory for replacement pump installation. For full amendment chronology, compliance times and the P/N list, the complete AD record (the full CASA AD publication) must be consulted.

The supplied AD contains no litigation history, no reference to court decisions, and names no cases. The document does not record any appeals, administrative reviews, or judicial decisions relating to the AD or its predecessor (AD/B747/279) within the text provided. Concretely:

• There are no case citations, no references to litigation outcomes and no mention of challenges to the AD in the supplied extract.
• The AD is issued under subregulation 39.1(1) of CAR 1998 and the opening paragraph frames the AD as an administrative regulatory instrument issued by a CASA delegate; the extract does not include any section describing a right of appeal, an administrative review mechanism or an alternative method of compliance process.

Implications for legal practitioners and researchers

• The absence of litigation references in the AD means the AD text itself provides no jurisprudential guidance about legal challenges to the directive, the standard of review applied by courts to CASA ADs, or precedent for challenges to AD content or the delegate’s exercise of power. Practitioners seeking to identify case law on ADs or CAR 1998 matters will need to consult external legal databases and judicial records; that search lies outside the content of this AD extract.
• Because the AD references prior AD/B747/279 and specific manufacturer service bulletins, legal questions about the interplay between ADs, manufacturer guidance and maintenance obligations could arise; however, the AD text here does not provide a history of disputed interpretation or any judicial resolution , it is a primary regulatory instrument, not a record of contested outcomes.
• Administrative remedies, if any, are not set out in the text provided. The lack of express appeal language in this extract does not mean review is impossible; it simply means the AD as provided does not narrate any litigation path or prior litigation decisions.

In short, the AD extract includes no litigation history or legal challenges and contains no case law references. Legal practitioners must therefore rely on external legal sources to discover any litigation that may have involved this AD or related CASA actions.

The supplied AD extract contains several practical pitfalls, omissions and formatting irregularities that create compliance risks and ambiguity if relied on without consulting the complete official AD. These “gotchas” are entirely grounded in the supplied text and should be noted by operators, maintainers and advisers:

1. Missing compliance section and timing details

   • The opening paragraph states actions must be taken “at the time mentioned in the compliance section,” but the compliance section is not included in the supplied extract. Without the compliance deadlines, an operator cannot know whether the AFM removal, AFM revision incorporation, placard installation or pump inspections are required immediately, within a specified flight hour cycle, or by a later date. This is a critical omission for planning and enforcement.

2. Absent list of affected pump part numbers (P/Ns)

   • Requirement 4 conditions installation of “Fuel pumps with the following part numbers (P/N) may not be installed...” but the extract does not provide the P/N list. Maintenance organisations cannot determine from this extract which pump P/Ns are prohibited without inspection documentation. The absence of P/Ns in the extract prevents definitive inventory control actions.

3. Annex B substantive text not present

   • The AD requires incorporation of either Annex A or Annex B into the AFM (Requirement 2). Annex A’s limitations for certain 747 models are provided. Annex B is referenced for Model 747‑400, ‑400D, and ‑400F but the supplied extract contains only headings and labels for Annex B; the substantive Certificate Limitations text for Annex B appears missing. Operators of 747‑400 variants cannot confirm the AFM text they must incorporate from this extract.

4. Formatting duplication and textual noise

   • The extract contains repeated headings and duplicated lines (for example multiple “AD/B747/280” and “Annex A/Annex B” headings). These artefacts create a risk of transcription errors if a technician copies text verbatim from this extract rather than from the authoritative CASA AD document. Reliance on a corrupt or partial copy can lead to noncompliance.

5. Model grouping inconsistencies in the placard instructions

   • The placard instructions in Requirement 3 contain a complex set of model groupings with repeated or partially garbled model lists in the supplied text (e.g. “For Model 747‑100, -200B, -200F, -200 a. For Model 747‑100, -200B, -200F, -200C, -100B, -300, -100B SUD,”). This fragmented presentation increases the chance of misidentifying which placard applies to which airframe configuration. Operators should confirm the exact model applicability from the official AD.

6. The AD displaces conflicting AFM limits

   • The AD states that the Annex limitations “supersede any conflicting basic AFM limitations.” That directly alters the operator’s AFM content. If an operator’s current maintenance or operational procedures are based on the basic AFM language that is now superseded, failing to update the AFM exactly as mandated may create regulatory noncompliance even if crew follow the prior basic AFM language.

7. Specific operational exceptions that affect weight/CG calculations

   • Annex A permits that “the zero fuel gross weight of the aeroplane plus the weight of CWT tank fuel may exceed the maximum zero fuel gross weight by up to 7,000 pounds” under defined circumstances and only “provided that the effects of balance (CG) have been considered.” This conditional permission requires explicit weight and balance assessment and documentation in flight planning. Misunderstanding or misapplying this proviso could produce unsafe loading or regulatory noncompliance.

8. Warnings that have operational consequence

   • Annex A contains unqualified operational warnings: “Do not reset a tripped fuel pump circuit breaker” and “Do not cycle the CWT pump switches from ON to OFF to ON with any continuous low pressure indication present.” These are strict behavioural prohibitions that affect in‑flight troubleshooting procedures. Training and procedures must be updated to reflect these absolute‑worded warnings.

9. Dependency on external SB/ASB content

   • The AD makes mandatory an inspection per Boeing ASB 747‑28A2248 and Crane Hydro‑Aire SB Motor‑Impeller‑28‑01. Because the AD does not reproduce these service bulletins in full, compliance requires access to and correct application of those documents. Variations between the bulletin text and the AD extract cannot be resolved from the extract alone.

10. Dispatch precondition tied to instrumentation

    • Annex A requires that “The CWT fuel quantity indication system must be operative to dispatch with CWT mission fuel.” If an operator planned to dispatch with CWT fuel but that indication system is inoperative, the operator must not dispatch for that mission profile. That affects dispatch decisions and may have scheduling and commercial impacts.

In short, the supplied extract is incomplete in ways that materially affect an operator’s ability to comply confidently. The primary gotchas are absent compliance dates, absent P/N list, missing Annex B content, and textual/formal inconsistencies. Each of these missing elements must be resolved by consulting the full, authoritative CASA AD document and the referenced service bulletins before taking action.

The AD sets out discrete compliance steps; however, the supplied extract omits the compliance timing and the pump P/N list. The steps below translate the AD’s requirements into operational actions grounded in the AD text, and identify the documentary proof an operator should collect. Where the extract omits information (compliance times, P/N list, Annex B text), the steps flag those omissions and treat them as prerequisites for final compliance planning.

Immediate action items (once the complete AD and referenced SB/ASB are obtained)

1. Obtain the full, official CASA AD/B747/280 text and the specified service bulletins.

   • The supplied extract does not include the AD’s compliance section or the P/N list referenced in Requirement 4, and Annex B’s substantive content is not present here. Obtain the authoritative CASA AD publication and Boeing ASB 747‑28A2248 dated 23 September 2002 and Crane Hydro‑Aire SB Motor‑Impeller‑28‑01 dated 17 September 2002 (including Appendix A). These documents contain the compliance deadlines, the P/N list for pumps, and the inspection procedures that are mandatory under the AD.

2. Confirm model applicability and select the correct Annex.

   • The AD’s applicability is “All model 747 series aeroplanes,” but the AFM revision instruction allows incorporation of Annex A or Annex B. Determine whether each aeroplane fleet unit requires Annex A (the provided text applies to Model 747‑100, ‑200B, ‑200F, ‑200C, ‑100B, ‑300, ‑100B SUD, 747SR, and 747SP) or Annex B (Model 747‑400, ‑400D, ‑400F). For 747‑400 family members, obtain the full Annex B text from the official AD as the supplied extract does not include Annex B substantive language.

3. Remove prior AFM revision required by AD/B747/279 Amdt 1.

   • Requirement 1 mandates removal of the earlier AFM revision. Record proof of removal in maintenance records, showing exactly which pages or material were removed and the date action was completed. Ensure the removed material is replaced only with the current, correct Annex material as required under Requirement 2.

4. Incorporate the applicable Annex into the AFM Limitations Section.

   • Requirement 2: revise the Limitations Section by incorporating the procedures included at Annex A or Annex B (the AD permits incorporation by inserting a copy of the applicable Annex into the AFM). Update AFM revision logs and distribute updated AFMs to flight crews. Ensure the AFM reflects that Annex limitations supersede any conflicting basic AFM limitations, and identify in the AFM revision history that the AFM was modified under AD/B747/280.

5. Install required placards in the exact wording and location prescribed.

   • For the listed older models (Annex A group), install the placard on or adjacent to the flight engineer’s fuel control panel stating exactly: “AD/B747/280 fuel usage restrictions required.” (Requirement 3a).
   • For Model 747‑400 series, install the placard on or adjacent to each pilot’s PFD stating exactly: “AD/B747/280 fuel usage restrictions required.” (Requirement 3b).
   • For 747‑400, ‑400D and ‑400F aeroplanes with a horizontal stabilizer tank, install adjacent to each pilot’s PFD: “Use of horizontal stabilizer tank is prohibited.” (Requirement 3c).
   • Record placard installation in aircraft equipment logs, with date and the person who installed them.

6. For pump replacements, confirm whether the pump P/N is among those affected and, if so, ensure inspection per the named ASB/SB has been completed.

   • Requirement 4 prohibits installation of certain pump P/Ns unless inspected to ensure wire‑bundle routing since the most recent assembly of the end cap and motor‑impeller housing. Using the P/N list (absent here , obtain from the full AD), confirm whether any replacement pump in inventory is an affected P/N. If it is:
     • Perform the inspection per Boeing ASB 747‑28A2248 dated 23 September 2002 or Crane Hydro‑Aire SB Motor‑Impeller‑28‑01 dated 17 September 2002 (including Appendix A).
     • Document the inspection thoroughly in maintenance records, including date of inspection, inspector identity, inspection findings and a statement that the wire bundle is properly routed since the most recent assembly.
     • Only then install the pump on an aeroplane. Retain the inspection record as the compliance record.

7. Implement and disseminate operational procedures required by Annex A (where Annex A applies).

   • For aircraft subject to Annex A, update SOPs, dispatch planning, and crew briefing materials to reflect:
     • Prohibition on fuelling and use of centre auxiliary fuel tank and auxiliary fuel tanks 1 and 4 (if installed).
     • Requirement that the CWT must contain at least 17,000 lb prior to engine start if CWT override/jettison pumps will be selected ON during flight.
     • Dispatch only with CWT mission fuel if the CWT fuel quantity indication system is operative.
     • Strict thresholds for selecting CWT override/jettison pump switches OFF at or before specified quantity benchmarks (7,000 lb or 3,000 lb) depending on pre‑start CWT quantity, and other pump operation rules.
     • Warnings: do not reset a tripped fuel pump circuit breaker; do not cycle CWT pump switches ON‑OFF‑ON with any continuous low pressure indication present.
     • Notes about normal jettison capability and low fuel operations.
     • Procedure for shutting off an affected failed centre wing tank pump if failure occurs with fuel in the centre tank.
     • The conditional zero fuel gross weight allowance, and requirement to consider balance (CG) effects when applying it.
   • Train flight crews and dispatchers on the AFM changes and placard meaning.

8. Update maintenance and operational records to show AD compliance.

   • Maintain documentary evidence of AFM removal and insertion of Annex A/B, placard installation, pump inspections per ASB/SB, and any corrective maintenance performed as a result of inspections. These records will be the primary evidence of compliance for CASA audits.

9. Validate dispatch criteria before each flight where CWT fuel or affected operations are planned.

   • For flights relying on CWT mission fuel, confirm the CWT fuel quantity indication system is operative and that CWT quantities meet the AFM thresholds noted in Annex A (where applicable). If the system is inoperative, do not dispatch with CWT mission fuel.

10. Monitor for further ADs or amendments.

    • Because this AD removed an earlier AFM revision and introduced new AFM limitations, operators should monitor CASA publications for any subsequent ADs that amend or clarify AD/B747/280, supply any omitted P/N lists or modify compliance dates.

Documentation and compliance proof checklist

• Full CASA AD/B747/280 official text (to obtain compliance dates and P/N list).
• Boeing ASB 747‑28A2248 dated 23 September 2002 (inspection procedure).
• Crane Hydro‑Aire SB Motor‑Impeller‑28‑01 dated 17 September 2002 (including Appendix A).
• AFM revision record documenting removal of AD/B747/279 Amdt 1 material and insertion of Annex A or Annex B.
• Photographic and log evidence of placard installation with date and installer sign‑off.
• Maintenance inspection reports for any pumps inspected under ASB/SB including statements on wire‑bundle routing and the assembly state.
• Crew and dispatch SOP updates and training records showing awareness of new AFM limitations.
• Dispatch checklists demonstrating confirmation of CWT fuel quantity indication system operability where dispatch with CWT mission fuel is intended.

Caveat on missing elements in the extract: This compliance plan is anchored to the AD text provided, but the supplied extract lacks the compliance section, the P/N list for pumps, and the full text of Annex B. Before finalising compliance scheduling, parts inventory holds or maintenance tasks that depend on precise P/N identification or compliance deadlines, obtain the full, authoritative CASA AD and the referenced service bulletins.