AD/B747/315 Amdt 1 - Wing Landing Gear Outer Cylinder

Applicability. The AD identifies the aircraft classes to which it applies in tabular form. It lists Model 747 -100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series aircraft. Those aircraft owners and operators are the ones to which this instrument applies.

Imported technical standard. The AD does not set out full technical instructions itself. Instead it requires "Action in accordance with the technical requirements of FAA AD 2007-01-10 Amdt 39-14882." The FAA AD is therefore the operative technical document for inspections, part identification, and replacement criteria. The AD also refers to Boeing Service Bulletins 747-32-2472 (original issue) and 747-32-2131 Revision 2, or later revisions approved by the FAA, as documents that "refer" and provide technical detail and procedures.

Inspection and replacement trigger. The directive’s requirement centres on inspection to determine whether the outer cylinder of the wing landing gear carries certain part numbers. Where those part numbers are present, replacement of the outer cylinder with a new, improved, or reworked part is required. Amendment 1 adds a one-time inspection for certain aircraft to detect an additional unsafe part number identified by the FAA.

Safety rationale. The Background explains the causal mechanism the AD addresses: fracture of an affected outer cylinder of a wing landing gear could result in collapse of the landing gear. The remedial mechanism chosen is part identification via inspection and correcting with replacement parts that are new, improved, or reworked.

Reference and approval nexus. The AD allows later revisions of the Boeing service bulletins where those later revisions are approved by the FAA. That creates a dependency: acceptable work is defined by whether the FAA has approved subsequent revisions of the service bulletins. The AD does not itself list alternative Australian approvals.

Temporal effect. The AD notes its revised effective date, "This Amendment becomes effective on 15 March 2007," and the issue signature date is 1 February 2007. Operational timing and aircraft scheduling therefore must take that effective date into account.

Authority and signature. The document is signed by David Villiers, Delegate of the Civil Aviation Safety Authority. The AD is presented as a CASA regulatory instrument adopting and enforcing the FAA AD requirements for the Australian-registered fleet covered by the applicability list.

Registered owners and operators of the specified Boeing 747 variants pay the primary direct compliance cost and must change behaviour to meet the AD. The applicability list is explicit: Model 747 -100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series aircraft. Any Australian-registered operator whose aircraft falls within those model designations is subject to the directive.

Maintenance organisations, maintenance personnel and line engineers engaged by those operators are affected operationally. The AD requires inspections to determine part numbers on the wing landing gear outer cylinder and replacements where necessary; those tasks fall to licensed maintenance staff and to organisations holding the necessary authorisations. The AD refers to FAA technical requirements and Boeing service bulletins, so the maintenance workforce must be able to access, interpret and implement the FAA AD text and the referenced Boeing service bulletins , in particular Boeing Service Bulletins 747-32-2472 original issue and 747-32-2131 Revision 2, or later FAA-approved revisions.

Parts suppliers and repair organisations that produce the "new, improved, or reworked" outer cylinders are indirectly affected through demand for replacement parts. Operators who identify an affected part number must obtain replacement outer cylinders that meet the AD’s requirement; the AD does not itself list acceptable replacement part numbers but prescribes replacement with new, improved, or reworked parts as defined by the FAA AD and/or service bulletins.

Regulatory decision-makers and inspectors within CASA and entities administratively associated with CASA enforcement will be affected in implementing and monitoring compliance with the AD. The document is issued under CASA authority and signed by its Delegate. The supplied text does not list enforcement mechanisms or penalties; however the regulatory issuance itself creates a compliance obligation on affected operators once the AD is effective.

Passengers, insurers and financiers are indirectly affected through operational impacts. If inspections require aircraft grounding for access or replacement, operators may face downtime costs, schedule disruptions, and maintenance costs that could influence service delivery, insurance claims or financing covenants. Those downstream impacts are not quantified in the AD; they follow from the practical implications of mandatory inspection and replacement work required on listed aircraft types.

Duties imposed by the supplied AD text are concentrated and specific. The primary duty is to undertake the actions set out "in accordance with the technical requirements of FAA AD 2007-01-10 Amdt 39-14882." In plain terms, affected operators must follow the FAA AD’s inspection and replacement instructions as transposed into Australian regulatory effect by this CASA AD. The AD also identifies Boeing Service Bulletins 747-32-2472 original issue, and 747-32-2131 Revision 2, or later revisions approved by the FAA, as reference documents. The operator’s duty therefore includes consulting those service bulletins and any later FAA-approved revisions.

A more specific duty stated in the Background is inspection to determine whether the outer cylinder of the wing landing gear has certain part numbers, and replacement of the outer cylinder with a new, improved, or reworked part if necessary. Amendment 1 adds the duty of an additional one-time inspection for certain aircraft to determine whether the outer cylinder has a further part number identified by the FAA; where that part is present, the duty is replacement with a reworked or new improved part.

Rights are not delineated in the supplied text. The AD does not set out an appeal process, exemption procedure, or arrangements for alternative methods of compliance within the short document provided. The AD does allow for later Boeing service bulletin revisions approved by the FAA to be followed; this creates a limited procedural flexibility: if the FAA approves a later revision of the referenced Boeing service bulletins, operators may use that FAA-approved revision. The AD does not itself specify an Australian approval route for alternative revisions or alternative compliance methods.

Operationally, operators retain the usual maintenance discretion to schedule inspections and replacements in a way that meets the AD’s timing and technical requirements, subject to the FAA AD and Boeing service bulletins. The AD’s instruction to act in accordance with FAA AD 2007-01-10 means the substantive content of duties and timing will be set by that FAA document and the service bulletins it references. The supplied AD text does not specify compliance intervals, so operators must consult the FAA AD to determine precise compliance timelines and any repeated inspection intervals.

Documentation duties are implicit in any airworthiness action but are not spelled out in the supplied AD text. The AD’s reference structure implies that operators will need to record identification of part numbers and any replacement actions to demonstrate compliance with the FAA AD as adopted by CASA.

The supplied AD text does not itself set out specific penalties, enforcement mechanisms, or sanctions. The document is an airworthiness directive issued by the Civil Aviation Safety Authority and signed by the Delegate, David Villiers, but no fines, imprisonment, or distinct enforcement provisions appear in the text provided. Where the AD requires action "in accordance with the technical requirements of FAA AD 2007-01-10 Amdt 39-14882," the enforcement of the substantive obligations will depend on the administrative and enforcement framework under which CASA issues airworthiness directives; however that framework and any associated penalties or enforcement procedures are not contained in the AD text supplied.

From the content present, the instrument operates as a regulatory requirement imposed on operators of specified Boeing 747 variants: compliance with the referenced FAA AD and with the referenced Boeing service bulletins is mandated. In practice, non-compliance with an AD typically exposes an operator to regulatory enforcement action by the issuing authority, but because the supplied text does not set out enforcement paths or penalties, the directive does not itself specify what CASA will do in cases of non-compliance, nor does it state whether particular administrative mechanisms such as grounding, enforcement notices, or fines are to be used.

The AD does impose clear technical obligations: inspection to identify specified part numbers and replacement when necessary. If operators do not undertake those activities, the practical consequences will depend on the CASA enforcement regime and on broader aviation safety regulatory arrangements. The short AD text does not identify any reporting obligations, escalation steps, or timelines for CASA action in case of non-compliance. Therefore, anyone requiring precise information on sanctions should not rely on this document alone; the AD as supplied identifies the obligation but does not detail the enforcement apparatus in the text provided.

This AD explicitly imports and relies on an external regulator’s instrument and manufacturer service documents rather than setting out full technical obligations itself. It directs operators to "Action in accordance with the technical requirements of FAA AD 2007-01-10 Amdt 39-14882." That means the CASA AD’s operative technical content is defined by the FAA AD. Consequently, the interaction is one-directional: CASA uses the FAA AD as the technical standard to be applied to Australian-registered aircraft of the listed models.

The AD also references Boeing Service Bulletins 747-32-2472 original issue, and 747-32-2131 Revision 2, or later revisions approved by the FAA. Those service bulletins are manufacturer documents that usually contain detailed procedures, part identification guidance, and replacement instructions. The CASA AD’s acceptance of later revisions only where approved by the FAA creates a link between FAA approval of manufacturer documents and the Australian instrument’s acceptable compliance options.

Because the supplied AD does not itself define compliance intervals, service procedures, or the specific part numbers beyond stating that certain part numbers are implicated, operators are required to consult the FAA AD and the Boeing service bulletins to understand procedures and timing. This structure makes the CASA AD operationally dependent on the content and updates of those external instruments. If the FAA AD or those Boeing service bulletins change, any FAA-approved later revision is potentially acceptable under the CASA AD text, subject to the FAA’s approval status.

The document does not reference other Australian legislative instruments, civil aviation regulations or advisory circulars in the supplied text. It does not state the effect of any inconsistency with domestic laws. Nor does it expressly provide for alternative methods of compliance under an Australian regulatory scheme. Therefore the AD interacts with other laws only to the extent that CASA’s broader statutory and regulatory powers provide the legal framework for issuing ADs; those enabling provisions are not quoted in the supplied document.

Practically, the AD creates an obligation for Australian-registered operators to meet standards articulated by a foreign regulator and by the manufacturer. Any legal questions about whether following the FAA AD satisfies Australian regulatory obligations, or about how to obtain Australian approval for an alternative method of compliance, are not addressed in the supplied text and would require reference to CASA’s broader regulatory instruments and administrative processes.

The supplied document is titled AD/B747/315 Amdt 1, indicating this is Amendment 1 to a prior AD. The body of the document itself explains the reason for the amendment: "Amendment 1 is issued in response to a new FAA AD, which requires, for certain aircraft, an additional one-time inspection to determine whether the outer cylinder has a certain other part number. For those aircraft, this Directive also requires replacement of the outer cylinder with a reworked or new improved part; as a result of identification of an additional unsafe part."

The AD states a revised effective date: "As specified in the Requirement document, with a revised effective date of 15 March 2007." The instrument further records that "This Amendment becomes effective on 15 March 2007." The signature block records the issuing date as 1 February 2007, signed by David Villiers, Delegate of the Civil Aviation Safety Authority.

The references to Boeing Service Bulletins and to the FAA AD are qualified as follows: the initial reference is to FAA AD 2007-01-10 Amdt 39-14882, and the Boeing service bulletins are identified as "747-32-2472 original issue, and 747-32-2131 Revision 2; or a later revision approved by the FAA." That language establishes a history and pathway for further amendments insofar as later FAA approvals of service bulletin revisions are accepted by the AD.

No earlier amendment texts, prior amendment dates, or prior AD numbers beyond the label AD/B747/315 are contained in the supplied text. The document presents Amendment 1 as a discrete action taken in response to an FAA AD that identified an additional unsafe part; it therefore appears as a reactive amendment to new information from the FAA. The supplied text does not list prior versions or their effective dates, nor does it include a schedule of subsequent amendments. Any further amendment history beyond Amendment 1 is not present in the material provided.

The supplied AD text contains no reference to any litigation, court challenges, judicial review, or administrative appeals. It does not refer to any legal proceedings either contesting the AD or interpreting its obligations. The document is a short directive establishing technical obligations by reference to external FAA and Boeing documents; there is no litigation history recorded in the material provided.

Because the AD does not include procedural or appellate provisions in its text, any litigation or administrative review relating to this AD would necessarily arise under broader aviation regulatory law or general administrative law, which are not part of the supplied document. The absence of litigation references in the AD means practitioners seeking to know whether the AD has been the subject of judicial scrutiny must consult other sources beyond this text.

For practitioners preparing compliance positions, the absence of litigation history in this instrument is relevant: the AD itself should be treated as the binding directive for its applicability and technical requirements, and any legal questions about scope, enforcement or alternative compliance mechanisms will require reference to CASA administrative processes or to external legal authorities, neither of which are contained within the supplied AD text.

The AD’s brevity and its reliance on external documents create several potential practical traps. First, the CASA AD does not contain the technical inspection procedures, part numbers, or detailed replacement instructions. Instead it mandates "Action in accordance with the technical requirements of FAA AD 2007-01-10 Amdt 39-14882" and refers to specific Boeing service bulletins. Therefore a common mistake would be to treat the CASA AD as self-contained. Operators must obtain and follow the FAA AD and the referenced Boeing service bulletins to determine the exact inspection methods, part numbers that trigger replacement, and timing requirements.

Second, the AD accepts only later revisions of the referenced Boeing service bulletins if those later revisions are approved by the FAA. The supplied text states "or a later revision approved by the FAA." That limits flexibility: manufacturers may issue revised service bulletins, but unless the FAA has formally approved a later revision, operators cannot rely on that later revision under the CASA AD wording. Practitioners must check the FAA approval status of any revised service bulletin before treating it as permissible under this AD.

Third, Amendment 1 introduces an additional one-time inspection to detect an additional unsafe part number identified by the FAA. The supplied text says that "for certain aircraft" this additional one-time inspection is required. The AD does not list which aircraft those are; the identification of those aircraft and the additional part number question will be specified in the FAA AD text. Misreading the CASA AD to omit that one-time inspection risk could lead to non-compliance for aircraft in the subset identified by the FAA.

Fourth, the AD requires replacement with a "new, improved, or reworked" part where an affected part number is present. The supplied text does not list acceptable replacement part numbers or approval pathways for reworked components. Operators must ensure that replacement parts meet the FAA AD and service bulletin definitions for acceptable parts; otherwise a replacement with an unapproved part could fail to meet the AD obligation.

Fifth, the AD provides revised effective dates: "As specified in the Requirement document, with a revised effective date of 15 March 2007" and "This Amendment becomes effective on 15 March 2007." Practitioners should not assume the AD applied from the issue date or signature date. Compliance scheduling, maintenance planning and operational decisions must use the effective date specified.

Finally, the supplied AD does not state enforcement mechanisms or penalties. That absence can create uncertainty about operational risk for marginal compliance decisions. Operators should not treat the absence of stated penalties in the text as an absence of regulatory consequence; the AD still imposes obligations, and failure to comply could have regulatory and safety consequences under CASA’s broader authority, even though those enforcement mechanisms are not described here.

The AD’s instruction is concise: act in accordance with FAA AD 2007-01-10 Amdt 39-14882 and consult the Boeing Service Bulletins identified. Compliance therefore requires a practical sequence anchored to those documents.

1. Obtain the operative documents. Secure the full text of FAA AD 2007-01-10 Amdt 39-14882 and the Boeing Service Bulletins 747-32-2472 original issue and 747-32-2131 Revision 2. Also check whether later revisions of those Boeing service bulletins exist and whether the FAA has approved any later revisions, because the CASA AD allows later FAA-approved revisions to be followed.

2. Confirm applicability. Verify that the aircraft in question is one of the models listed: Model 747 -100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, or 747SP series aircraft. If the aircraft is listed, the AD applies and the FAA AD’s technical requirements must be followed.

3. Follow the FAA AD procedures. The CASA AD imports the FAA AD’s technical requirements. The FAA AD will set out inspection methods, identification procedures for part numbers, compliance timeframes, and replacement criteria. Execute inspections exactly as specified in the FAA AD.

4. Inspect for part numbers. The AD requires inspection to determine whether the outer cylinder of the wing landing gear has certain part numbers. Conduct the inspections as specified in the FAA AD and using the Boeing service bulletin procedures for part identification as necessary.

5. Replace affected parts. If inspection finds an affected part number, replace the outer cylinder with "a new, improved, or reworked part" as required by the AD. Ensure that any replacement part conforms to the FAA AD and to the Boeing service bulletin definitions of acceptable replacement or rework, including any FAA approvals or other certification requirements specified.

6. For aircraft subject to Amendment 1’s additional inspection, perform the one-time inspection required to determine whether an additional part number identified by the FAA is present, and replace where necessary with reworked or new improved parts.

7. Schedule and document work relative to the effective date. The AD’s revised effective date is 15 March 2007. Ensure the inspections and any mandated replacements are scheduled in accordance with the timing and intervals in the FAA AD, not merely the CASA signature date.

8. Maintain records. While the AD text supplied does not set out recordkeeping obligations, documenting inspections, findings, parts replaced, part numbers removed and fitted, service bulletin and FAA AD revision references, and dates of work will be necessary to demonstrate compliance to regulators and for airworthiness records.

9. Use FAA-approved revisions. If adopting a later revision of the referenced Boeing service bulletins, confirm FAA approval of that revision before proceeding; the CASA AD permits later revisions only where approved by the FAA.

10. Coordinate logistics. Operators should ensure availability of qualified maintenance personnel, access to the aircraft’s landing gear hardware for inspection, and procurement routes for replacement outer cylinders that meet the FAA AD’s and Boeing service bulletin’s acceptance criteria. Where replacement requires a "reworked" part, ensure the rework has been performed under the authority and procedure that the FAA AD or Boeing service bulletin recognises as acceptable.

This sequence is necessarily anchored to the FAA AD and the Boeing service bulletins referenced in the CASA AD. The CASA AD itself is a short directive that imports technical obligations; full compliance therefore requires reading and applying the FAA and Boeing materials named in the AD text.