AD/SF340/104 - Fuel Tank Conduits Wiring Protection

The AD rests on a small set of interconnected concepts and references. These are explicit in the text: applicability, mandatory modification, method-of-compliance (a SAAB service bulletin or later EASA-approved revision), a compliance timeframe, component-level work steps, and regulatory provenance (FAA SFAR88, JAA letters, and an EASA AD reference).

Applicability. The AD is limited to "Model SF340A and 340B aircraft, all serial numbers." That phrasing defines the universe of regulated aircraft by type and model, without distinguishing by serial number, production batch, or configuration. The AD does not state that only passenger-configured aircraft are covered; it applies to all serial numbers of the two listed models.

Mandated work. The AD mandates specific modifications: Mod 3164 and Mod 3165 (right and left wing). The required actions are to be "performed in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." The AD therefore ties compliance to a manufacturer service bulletin, with the explicit allowance that a later EASA-approved revision may be followed.

Scope of tasks. The AD lists concrete maintenance tasks: removal of specified fuel pumps, fuel level switches and refuel shutoff valves; inspection of wiring to those components; twisting of wiring; installation of shrinkable tubing; reinstallation of the components; and operational and functional testing of the fuel measuring/indicating system. Each step is described in the AD text; the AD does not elide technical detail beyond the enumerated actions.

Time limit. Compliance is required "Within 72 months after the effective date of this Directive." The effective date is stated as 25 October 2007. Thus the AD imposes a long but finite compliance window of six years.

Regulatory lineage and rationale. The AD expressly situates itself in the post-SFAR88 regulatory response to fuel-tank explosion risk. It mentions "Subsequent to accidents involving Fuel Tank System explosions in flight (Boeing 747-131 flight TWA800) and on ground, the United States Federal Aviation Administration (FAA) published Special Federal Aviation Regulation 88 (SFAR88) in June 2001." It then records that the JAA recommended a similar regime and that type-certificate holders for passenger transport aircraft with specified size thresholds were required to conduct a design review against explosion risks. The AD states causation between that design-review requirement and the AD's modification mandate: "As a consequence of the design review mentioned above, this Airworthiness Directive requires a modification to install extra protection of wiring installed in fuel tank conduits."

Cross-references. The AD points to external instruments it relies on or parallels, including "EASA AD 2007-0248" and the SAAB Service Bulletin. The AD text uses those references as the method-of-compliance and background justification.

Authority and issuance. The directive is signed by "Charles Lenarcic, Delegate of the Civil Aviation Safety Authority" and dated 14 September 2007. The document displays the administrative fact that CASA, through a delegate, issued the AD.

Limits of textual authority. The AD itself supplies a required work programme and a timetable, but does not include specified penalties, civil remedies, or administrative sanction provisions in its text. It also does not specify approved repair facilities, manpower qualifications, parts provenance, precise labour-hours, or a parts list beyond the component identifiers listed. The AD does require the SAAB Service Bulletin to be followed, which is the source of step-by-step technical instruction; the AD text does not replicate the full technical content of that bulletin.

Taken together, the main concepts are: a targeted, model-specific mandatory wiring-protection modification; an instruction to follow a particular SAAB Service Bulletin or later EASA-approved revision; a six-year compliance window; and a regulatory genesis tied to post-SFAR88 fuel-system safety work and related European regulatory advice.

The AD names applicability and, by implication, the responsible parties. The explicit applicability clause is "Model SF340A and 340B aircraft, all serial numbers." The AD therefore regulates all airframes of those two types irrespective of serial number. The AD does not separate between operators, owners, leaseholders or maintenance organisations; it simply imposes the required actions on the identified aircraft.

Primary actors. The immediate practical burden falls on the entity that maintains or operates the listed aircraft. The AD does not say "operator" or "owner" expressly, but airworthiness directives customarily target the operator or owner responsible for an aircraft's continuing airworthiness. The AD requires performance of Modifications 3164 and 3165 "in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." The reference to a service bulletin denotes that technically competent maintenance work and adherence to the SB process is required; the AD text thus directly affects maintenance providers that carry out the physical tasks.

Type-certificate holders and manufacturers. The Background section records that, under SFAR88 and JAA advice, "all holders of type certificates for passenger transport aircraft with either a passenger capacity of 30 or more, or a payload capacity of 7 500 pounds (3 402 kg) or more, which have received their certification since 1 January 1958, are required to conduct a design review against explosion risks." That language indicates that type-certificate holders were required to perform design reviews; the AD then implements a modification for the listed model as "a consequence of the design review." For the SAAB SF340 models, the manufacturer and the type-certificate holder were the parties whose design review produced the mitigation design supplied in the SAAB Service Bulletin. The AD therefore connects to obligations and actions taken by type-certificate holders, but the operational mandate in the AD applies to the aircraft themselves.

Regulators and issuers. The AD is issued by the Civil Aviation Safety Authority (CASA), through a named delegate, and therefore affects CASA's regulatory oversight function. It also references EASA (through the permission to follow a later EASA-approved revision of the SAAB Service Bulletin) and notes EASA AD 2007-0248. The AD documents coordination or parallel action across international authorities.

Maintenance and parts suppliers. The AD specifies removal and reinstallation of pumps, switches and valves and installation of shrinkable tubing and wiring twists. Those tasks require parts, tooling and technical instructions from SAAB or approved suppliers. The AD does not specify approved parts lists, nor does it state explicitly where shrinkable tubing must come from. The SAAB Service Bulletin is the designated technical source; suppliers and maintainers will need to consult it.

Less directly affected parties. Lessor and finance stakeholders in SF340A/B aircraft are consequentially affected because the AD imposes physical modifications to the aircraft. The AD’s compliance window and any associated downtime are matters these stakeholders will need to manage. The AD does not mention lease arrangements or financial liability allocation; the document simply imposes the aircraft modification requirement.

In sum, the AD affects all SF340A and SF340B airframes by imposing a mandatory wiring-protection modification to be performed in accordance with the specified SAAB Service Bulletin. The practical actors carrying out, financing and permitting the work are the operators/owners and the maintenance organisations that will perform the modifications in line with the service bulletin or an EASA-approved revision.

The AD establishes a narrow set of duties and creates limited rights by reference. The obligations are explicit and procedural; the AD does not create new legal rights or defences in the text provided.

Primary duty to perform modifications. The AD's core duty is mandatory: "Unless previously accomplished, perform Modifications 3164 (Right Hand Wing) and 3165 (Left Hand Wing) in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." That sentence imposes a requirement to carry out two named modifications, with the method of compliance tied to a named service bulletin, which may be superseded by a later EASA-approved revision. The duty is to be discharged within the stated time limit of "Within 72 months after the effective date of this Directive."

Duty to inspect and test. The AD specifies inspection and testing steps within the modification sequence: inspection of the wiring to the fuel pumps, fuel level switches and the refuel shutoff valves; twisting of wiring; installation of shrinkable tubes; and an "Operational and Functional test of the fuel Measuring/Indicating system." These are substantive technical duties the AD requires as part of completing the Modification 3164/3165 package.

Duty to reference approved methods. The AD delegates technical method to a SAAB service bulletin, so the duty includes compliance with that manufacturer's procedures or an EASA-approved revision. The AD does not specify alternative methods of compliance in the text provided; the only permitted method is the named service bulletin or a later EASA-approved revision.

Implied duties. The AD does not set out explicitly who must arrange the work, how to document compliance, or which organisations are authorised to perform the work. It does, however, create a temporal duty to complete the stated modifications within the 72-month window. Parties responsible for aircraft continuing airworthiness must ensure the work is done within that window.

Rights and options recorded in the AD. The AD gives a limited right to use a later EASA-approved revision of the SAAB Service Bulletin, not every later revision. The phrasing "or late EASA approved revision" is a right to adopt a superseding EASA-approved issue of the SB if one exists. The AD also contains the note "EASA AD 2007-0248 refers", which functions as an information pointer but not a procedural right in the AD text.

Absence of explicit enforcement or appeals procedure. The AD itself does not set out penalty provisions, enforcement steps, exemptions, or an appeals mechanism. It does not provide a formal carve-out for aircraft that cannot practically be modified. There is no express right to defer, or to seek alternative corrective actions, within the AD text supplied. The AD’s silence on those matters is a textual gap that affected parties must address with the issuing regulator or by reference to the broader regulatory framework outside this document.

Summary of duties and rights in plain terms. Duty-holders must: 1) ensure the two wing modifications are performed for each affected SF340A/B airframe; 2) carry out the inspection, twisting, shrink-tubing and reinstallation steps; and 3) run the operational and functional tests of the fuel measuring/indicating system. They may comply using SAAB Service Bulletin 340-28-026 dated 5 July 2007, or a later EASA-approved revision. The AD does not grant other procedural rights within its text, and it does not detail enforcement, exemptions or record-keeping procedures.

The AD text supplied does not set out specific penalties, sanction mechanisms or enforcement processes. The document is an Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) delegate, and it sets mandatory compliance requirements and a compliance timeframe, but it contains no explicit provisions on penalties for non-compliance within its own text.

What the AD does provide. The AD prescribes the required work and the deadline: perform Modifications 3164 and 3165 "Within 72 months after the effective date of this Directive" and to do so "in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." It also records that it "becomes effective on 25 October 2007." These are the operative obligations that an enforcement regime would focus on.

What is absent. The AD does not, in the text provided, mention fines, suspension of certificates, grounding orders, administrative penalties, criminal offences, or prosecution avenues. It does not supply a procedure for how CASA will verify compliance or the documents the holder must furnish. The AD does not refer to any appeal or exemption mechanism, nor does it state whether an Alternative Method of Compliance (AMOC) is available, and if so how to seek it.

Interpretive point grounded in the document. The AD is signed by a CASA delegate and is in the form of a standard airworthiness directive. While the AD text supplied omits penalties, readers should not infer from that omission that non-compliance carries no regulatory consequence. The AD itself conveys a mandatory maintenance action. Absent explicit enforcement details in this AD text, the means by which CASA would enforce compliance, or the penalties it may apply, are not stated here and require reference to the broader CASA regulatory framework and enforcement policies external to the AD text.

Reference to external enforcement instruments. The AD references EASA AD 2007-0248 and SAAB Service Bulletin 340-28-026. It does not invoke any particular enforcement provisions from those documents in the text provided. Any enforcement action would necessarily be taken under CASA’s statutory powers and regulatory instruments outside the AD’s text. Those additional instruments are not included in the supplied material and are therefore not described here.

Practical enforcement implication. The AD creates a clear compliance duty and a fixed timeframe. For an operator or owner, that creates an operational imperative to schedule and complete the work. Because the AD does not itself set out penalties, those concerned should seek the relevant CASA guidance or statutory provisions that govern enforcement of airworthiness directives to understand the potential sanctions or steps CASA would take in the event of non-compliance.

The AD explicitly situates itself in a network of international regulatory instruments rather than domestic statutes contained in the text provided. The text names and references several external regulatory actions and artefacts; those interactions are stated rather than described in detail.

FAA SFAR88 and JAA recommendations. The Background section links the AD to the FAA’s Special Federal Aviation Regulation 88 (SFAR88), noting that SFAR88 was published in June 2001 after fuel-tank explosion events including the TWA800 accident. The AD states that "In their Letters ... the European Joint Airworthiness Authority (JAA) recommended the application of a similar regulation to the National Aviation Authorities (NAA)." The AD records that type-certificate holders were required to conduct a design review under the SFAR88-type regime and that the AD is "a consequence of the design review mentioned above."

EASA AD reference. The AD contains the note "EASA AD 2007-0248 refers." It also permits compliance with "SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." Those two references indicate the AD is intended to align with European Aviation Safety Agency (or its predecessor) directives and approved documentation. The AD thereby establishes a cross-jurisdictional link where an EASA-approved revision of the SAAB Service Bulletin or an EASA AD may be used to satisfy the CASA AD’s mandated modification.

Manufacturer service bulletin as technical standard. The AD designates the SAAB Service Bulletin as the method of compliance, making the manufacturer's SB part of the compliance framework. This is an interaction between regulator and manufacturer guidance: CASA prescribes action but ties the technical method to the manufacturer’s SB or a later EASA-approved revision.

No domestic statutory cross-references in the text. The AD does not cite or quote any Australian statute, regulation, or CASA enforcement rule in the supplied text. It does not include references to civil aviation acts, regulatory instruments or administrative processes that would define enforcement or appeal rights. The AD therefore stands as a CASA instrument referencing other airworthiness instruments but not reproducing or summarising the statutory enforcement framework.

Practical cross-jurisdictional implication. By referencing SFAR88, JAA letters and EASA AD 2007-0248, the AD indicates that its technical requirement is part of a broader international safety programme addressing fuel-tank wiring protection. The consequence is that operators who also must comply with EASA or FAA-derived obligations may be able to coordinate compliance across jurisdictions. The AD explicitly permits the use of an EASA-approved revision of the SAAB SB, which can reduce duplication where EASA or SAAB documentation has been updated.

Limits of interaction stated in the AD. The AD does not specify how conflicts would be resolved if an EASA-approved revision diverges from the SAAB SB or if a later SAAB revision is not EASA-approved. The AD’s wording restricts permissive use to EASA-approved revisions, not to arbitrary manufacturer revisions. That creates a narrow route for cross-reference to EASA documents; it does not create an open-ended recognition of other jurisdictions’ approvals.

In summary, the AD interacts with other laws and instruments by adopting and referencing international regulatory outcomes and a manufacturer service bulletin as its means of compliance. It aligns CASA’s requirement with the SFAR88-inspired design-review regime and with EASA’s related ADs and approvals, while not providing domestic statutory enforcement detail within the document text itself.

The AD text supplied contains limited amendment-history data. What the document explicitly records is the service bulletin date, the AD issue and effective dates, and references to related external ADs.

Document dates and effective date. The AD is dated 14 September 2007 and signed by Charles Lenarcic, Delegate of the Civil Aviation Safety Authority. It states "This Airworthiness Directive becomes effective on 25 October 2007." The compliance deadline is "Within 72 months after the effective date of this Directive." That provides a clear timeline: issue 14 September 2007; effective 25 October 2007; compliance by 25 October 2013 at the outer limit.

Service bulletin date and permitted revisions. The AD requires performance of the modifications "in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." That is an explicit recognition that the original service bulletin is dated 5 July 2007 and that later EASA-approved revisions to the SB are acceptable. The AD therefore includes built-in allowance for subsequent approved revisions to the SB without changing the AD itself.

Cross-reference to EASA AD. The AD contains the line "Note: EASA AD 2007-0248 refers." That indicates that, at the time of issuance, an EASA airworthiness directive existed which is relevant to the same or similar safety issue. The AD does not say whether it is amending previous Australian ADs for the SF340 series; it does not list superseded ADs or prior Australian directives. The text supplied includes no enumeration of amendments or prior AD versions.

Absence of subsequent Australian amendments in the supplied text. The AD text as provided does not record any subsequent amendments, revocations, or expirations beyond the initial effective date and the compliance deadline. The supplied material does not include later CASAgazette entries or later CASA AD numbers that might supersede or extend this AD. Therefore, based solely on this text, the amendment history is limited to the initial issuance and the permitted use of later EASA-approved SB revisions.

Implication of the "or late EASA approved revision" clause. By permitting a later EASA-approved revision of the service bulletin, the AD allows future technical changes to the prescribed method without the need for a formal amendment of the AD for the narrow purpose of adopting a later EASA-approved SB revision. The AD itself is not amended by such a revision; instead, compliance can be achieved using the approved revision.

Record in the supplied text. The AD concludes with the signature block and date, and repeats the AD identifier lines. Apart from that, the supplied text contains no further amendment entries, corrigenda, or later notes. Anyone needing the full amendment history or later changes would need to consult CASA's repository or subsequent regulatory issuances; those records are not present in this excerpt.

The supplied AD text does not include any litigation history, cited cases, or references to judicial or administrative decisions. The only event referenced is a historical accident: "Subsequent to accidents involving Fuel Tank System explosions in flight (Boeing 747-131 flight TWA800) and on ground..." That reference is background context for the regulatory programme leading to SFAR88 and related design reviews. The document does not cite any court decisions, administrative appeals or judicial review matters that arose from this particular AD.

Implication of absence of litigation detail. Because the AD does not contain any litigation history, there is no record in the supplied text of legal challenges to the AD, appeals by affected parties, or enforcement actions that were litigated. The absence of such material in the document means that any enquiry about subsequent legal disputes, challenges to CASA's issuance of the AD, or litigation over compliance would require consulting external legal or administrative records that are not included here.

Cross-referenced events are not litigation. The AD’s background references regulatory actions (SFAR88, JAA letters, EASA AD 2007-0248) and an accident (TWA800). None of those references in the supplied text is presented as a judicial decision. The AD’s text does not suggest that litigation shaped the AD’s content or that the AD itself was subjected to adjudication prior to or after its issuance.

Practical note for researchers. If a reader requires litigation history concerning this AD,challenges to its validity, enforcement actions in Australia, or disputes about the scope of necessary modifications,those records would need to be sourced from CASA's enforcement archives, court records, or administrative tribunals. The AD excerpt supplied here does not contain that information.

The AD text contains several drafting and practical features that can create compliance traps or operational ambiguities if not noted. These are matters grounded in the specific wording and omissions of the AD as supplied.

1. Compliance window length and scheduling. The AD requires completion "Within 72 months after the effective date of this Directive." The effective date is 25 October 2007, so the deadline is a discrete calendar date. Operators must not assume a rolling or flexible deadline; the AD ties compliance to the effective date. Failure to account for maintenance scheduling lead times, parts procurement, and regulatory sign-offs could result in missed compliance.

2. "Unless previously accomplished" qualification. The AD begins "Unless previously accomplished, perform Modifications 3164 ... and 3165 ..." That language means aircraft that have already had equivalent work completed before the effective date may not need to repeat it. The AD, however, does not describe an approval process to accept prior work as compliant. Operators must be able to demonstrate that prior work is equivalent to the SAAB Service Bulletin method; the AD does not specify documentary standards for that demonstration.

3. Singular method-of-compliance reference. The AD requires that the modifications be performed "in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." The AD does not provide an alternative approved method nor a defined process within the AD text for seeking approval of an Alternate Method of Compliance. The only permitted variant is a later EASA-approved revision. If a later SAAB SB revision exists but is not EASA-approved, the AD’s permissive wording does not itself permit its use.

4. Technical detail omitted from the AD text. The AD describes the required steps at a high level but does not provide detailed drawings, part numbers for shrinkable tubing, or labour-hour estimates. The technical specifics are in the SAAB Service Bulletin, which the AD directs operators to use. Failure to obtain and follow the correct version of the SB creates a compliance risk.

5. Reinstallation of components. The AD requires removal of specific pumps, switches and valves and their later installation. That involves parts handling and potential line-requalification steps. The AD mandates an "Operational and Functional test of the fuel Measuring/Indicating system." If that test fails, the AD does not provide testing acceptance criteria in its text; such criteria will be in the SB. Operators must ensure the testing procedure and pass/fail criteria come from the SB or later EASA-approved revision.

6. Cross-references to other instruments. The AD notes "EASA AD 2007-0248 refers." Operators will need to obtain that EASA AD and reconcile its content with the CASA AD and the SAAB SB. Differences or additional requirements in the EASA AD may affect how compliance is documented. The AD does not spell out how to resolve differences between the documents.

7. Documentation and proof of compliance. The AD does not state what records must be kept to show compliance. It therefore will be necessary to ascertain acceptable documentary proof,work orders, maintenance release entries, SB conformity statements,from CASA guidance or broader regulatory requirements, not from the text of the AD.

8. Responsibility and cost. The AD does not allocate cost responsibility between owners and lessors. Parties should clarify contractual obligations for modifications, especially where aircraft are on lease at the time the work must be performed. The AD imposes the work on the aircraft, not on a named contractual party; that leaves contractual allocation to private arrangements.

9. Potential confusion about "all serial numbers." The AD applies to "Model SF340A and 340B aircraft, all serial numbers." That universal phrasing can cause confusion where an aircraft has been modified in production or retrofit to a configuration that may already include the required protection. Operators should not assume exceptions; they must document equivalence to the SB if the work has been done previously.

10. Timing of allowed SB revisions. The AD permits the use of a "late EASA approved revision." It does not define whether "late" means "later than the 5 July 2007 SB" or "later than the effective date of the AD." That ambiguity matters if different revisions were approved at different times. Practically, operators should use an EASA-approved SB revision current at the time of the modification or obtain confirmation from CASA.

These gotchas arise from what the AD says and what it omits. Addressing them requires consulting the SAAB Service Bulletin itself, any referenced EASA AD, and CASA's broader guidance on record-keeping, alternative methods of compliance and enforcement. The AD text, taken on its face, creates precise technical duties but leaves several procedural and evidentiary questions unanswered.

The AD prescribes a concise compliance route and a timetable; practical compliance requires following the technical instructions, documenting the work and aligning scheduling and parts supply to the fixed deadline.

1. Determine applicability to each airframe. The AD applies to "Model SF340A and 340B aircraft, all serial numbers." For each aircraft in an operator’s fleet, confirm the model designation. If the aircraft is an SF340A or SF340B, it falls within the scope of this AD unless the required work was completed prior to the AD effective date and can be demonstrated to match the AD’s required method.

2. Confirm prior accomplishment. The AD starts "Unless previously accomplished, perform Modifications 3164 ... and 3165." If an aircraft has already had equivalent work done, gather documentary proof that the earlier work matches the SAAB SB method or an EASA-approved revision. Because the AD text does not specify evidence standards, retain the original work orders, maintenance release, SB compliance statement and any records from the maintenance organisation.

3. Obtain and use the correct technical instructions. The AD mandates performance "in accordance with SAAB Service Bulletin 340-28-026, dated 5 July 2007 or late EASA approved revision." Obtain the named SAAB Service Bulletin (SB 340-28-026, 5 July 2007) and check for any later EASA-approved revision. If a later EASA-approved revision exists, confirm its approval status and use that revision. The SB will contain detailed procedures, parts lists, inspection criteria, torque settings, part numbers and the requisite operational and functional test protocols for the fuel measuring/indicating system.

4. Plan and schedule the maintenance task. The AD requires performance "Within 72 months after the effective date" (effective date 25 October 2007). Schedule the work with due allowance for lead time on parts, certified maintenance slots, and regulatory sign-off. The modification involves removal and reinstallation of pumps, switches and valves, twisting and shrink-tubing wiring, inspections and functional tests. Allocate sufficient shop time and experienced personnel.

5. Engage qualified maintenance organisation and authorised personnel. The AD itself does not specify which organisations or personnel can perform the work. Practically, use a maintenance organisation approved to work on SF340 systems and familiar with fuel-system work. The SAAB SB will state any special authorisation or tooling requirements that must be met.

6. Execute the modification steps. Follow the SB’s step-by-step instructions for Modifications 3164 and 3165. As summarised in the AD, the sequence includes: removal of fuel pumps 5QM and 6QM, fuel switches 31EB, 32EB, 9QA, 10QA, 11QA and 12QA, and refuel shutoff valves 15QA and 16QA; inspection of the wiring to the fuel pumps, fuel level switches and refuel shutoff valves; twisting of the wiring; installation of shrinkable tubing to the specified wiring; reinstallation of the pumps, switches and valves; and operational and functional testing of the fuel measuring/indicating system. Ensure all actions meet the acceptance criteria in the SB.

7. Perform and document operational and functional tests. The AD mandates an "Operational and Functional test of the fuel Measuring/Indicating system." Execute the tests as described in the SB. Record test results and any remedial work required to achieve passing results. Retain test records as part of the aircraft maintenance log.

8. Record compliance and retain evidence. Although the AD does not enumerate record retention requirements, maintain clear documentation demonstrating compliance with the AD and the SB used. Typical evidence includes the SB revision used, maintenance work orders, parts used (with part numbers), test records, maintenance-release signatures and dates, and a statement attesting to performance of Mod 3164 and 3165. Keep these records available for CASA inspection.

9. Coordination where aircraft are leased or subject to shared custody. Because the AD imposes a modification on the aircraft, parties should review leasing and finance agreements to allocate cost and scheduling responsibility. The AD does not allocate cost; those allocations are contractual.

10. Cross-check EASA AD 2007-0248 and CASA guidance. The AD notes "EASA AD 2007-0248 refers." Obtain that EASA AD to verify any additional requirements or clarifications. Also check CASA publications and advisories contemporaneous to the AD for procedural guidance on documentation, alternatives to compliance and enforcement expectations.

11. Address alternatives and exceptional cases through CASA. If an operator believes an alternative method of compliance is necessary, the AD does not specify a process within its text. Contact CASA for instructions on how to seek acceptance of an alternative method or clarify acceptable documentary evidence that prior work is equivalent.

12. Verify completion against the deadline. Ensure that the work is completed and documented prior to the end of the 72-month compliance period. If the work cannot be scheduled within the timeframe, engage CASA early to determine any available administrative options; the AD text does not itself provide an extension mechanism.

Following these steps, grounded in the AD’s operative text,applicability, the SAAB SB reference, the specific component and wiring tasks, the operational/functional testing requirement, and the six-year deadline,will satisfy the technical obligations spelled out in AD/SF340/104.