AD/SF340/26 Amdt 2 - Modification of Exit and Dome Light Assemblies

This instrument uses a concise set of administrative building blocks typical of an airworthiness directive: Applicability, Requirement, Compliance, Background, Amendment history, effective dates and notes. Each term is used in the AD text and carries a functional role.

• Applicability. The AD applies to particular serial-numbered airframes: "SAAB SF340A-004 to -159 and SAAB 340B-160 to -179. As specified in SAAB-SCANIA AB Service Bulletin (SB) SAAB 340-33-030." The AD thus confines the technical obligation to identified airframes and defers to the SB for any further identification criteria.

• Requirement. The AD does not embed technical instructions in full. Instead it mandates: "Action in accordance with SAAB-SCANIA AB SB 340-33-030 Revision 2." It also permits compliance by performing the actions in "later approved revisions" of that SB. Effectively the AD adopts the SB as the primary technical instrument for compliance.

• Compliance. The AD states that compliance must be "in accordance with the requirement document with a revised compliance date of 31 August 1992, unless already accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD." The text therefore fixes a compliance date by reference to the requirement document and to prior amendments.

• Background. The safety problem is recorded as a performance shortfall in the emergency lighting system: "combination of power supply loads and the in-flight temperature gradient for the power packs in the emergency lighting system can lead to a reduction in the operating time below the required ten minutes." The AD therefore aims to restore minimum endurance.

• Amendment mechanics. The AD explains prior changes: Amendment 1 introduced certain Requirement documents and clarified text; Amdt 2 (this Amendment) removes one such external reference and redefines applicability while being largely editorial.

Two governance points embedded in the text matter for operators and maintainers. First, the AD delegates technical detail to the OEM service bulletin, but captures the mandatory legal status of the SB actions through the AD. Second, the AD explicitly allows use of later approved SB revisions for compliance, creating a mechanism for post-issue technical updates to be relied upon for regulatory compliance.

The AD also records administrative provenance: it is signed by "William David, Delegate of the Civil Aviation Safety Authority" and dated 30 November 2009, with the Amendment stated to become effective on 28 January 2010. The original Directive effective date is retained in the notes as 30 April 1986. These dates, the compliance date and the reference to earlier ADs create temporal layers that are essential to interpreting whether an individual airframe remains non-compliant or whether it was already addressed under Amendment 1.

This AD directly affects a narrow group of actors, as specified in the instrument.

• Aircraft operators and owners of SAAB SF340 series within the serial ranges listed. The Applicability clause identifies the precise range "SAAB SF340A-004 to -159 and SAAB 340B-160 to -179" and refers to SAAB-SCANIA SB 340-33-030 for any further specifics. Those operators are the primary parties who must ensure the mandated modifications are performed.

• Aircraft maintenance organisations and licensed maintenance personnel responsible for performing the modifications required by the SAAB service bulletin. The AD does not contain technical instructions but requires execution "in accordance with SAAB-SCANIA AB SB 340-33-030 Revision 2," meaning maintainers must obtain and follow that SB or a later approved revision.

• SAAB-SCANIA AB as the issuer of the service bulletin. The AD adopts the SB as its requirement document and thereby elevates the SB's instructions into mandatory airworthiness requirements for the listed aircraft.

• The Civil Aviation Safety Authority and the named delegate. The document is issued under the authority of the Civil Aviation Safety Authority (CASA), signed by "William David, Delegate of the Civil Aviation Safety Authority." The AD is an administrative instrument of CASA; the delegate signs the Amendment.

• Potentially national aviation authorities and third-party regulators previously referenced (Swedish AD No. 1-047 and FAA AD 92-03-05) are implicated historically by the AD's Amendment history. Amdt 2 "removes reference to FAA AD 92-03-05 as a Requirement document," and the AD notes "Swedish AD No. 1-047 refers." Those references indicate the AD interacted with other regulators' materials at earlier stages, but the current Amendment removes the FAA AD reference and relies on the SAAB SB.

Indirectly affected parties include passengers (reliant on emergency lighting performance), insurers (whose exposure could be influenced by continuing airworthiness), and aircraft lessors who must ensure lessees comply with mandatory directives. The AD does not itself address contractual allocation of costs or record-keeping, so such consequences will be managed through lease agreements and operator procedures.

Who decides and who pays is implicit: CASA (via the delegate) imposes the requirement and the operators and maintenance organisations bear the cost and operational impact of implementing the SB-specified modification. The AD provides a limited procedural right: operators may comply by using "later approved revisions" of the SB, giving them a route to rely on subsequent technical updates approved by the competent authority.

The AD establishes a small set of duties and a single explicit right regarding acceptable compliance documentation.

Duties

• Perform the SB actions. The core duty is to "Action in accordance with SAAB-SCANIA AB SB 340-33-030 Revision 2." The AD makes performance of the service bulletin's instructions mandatory for each aircraft within the stated Applicability.

• Respect the compliance timeframe. The AD requires compliance "in accordance with the requirement document with a revised compliance date of 31 August 1992, unless already accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD." That places the compliance temporal obligation by reference; operators must confirm whether the work was already accomplished under Amendment 1 or must be completed to meet the referenced compliance timeline.

• Apply to only the specified serials. The duty is limited to the aircraft within the serial-number ranges listed in Applicability and "As specified in SAAB-SCANIA AB Service Bulletin (SB) SAAB 340-33-030." The operator must verify that their airframe falls within the listed ranges and any additional SB criteria.

Rights and flexibilities

• Use of later approved revisions. The AD expressly permits that "The use of later approved revisions of the Requirement document is acceptable for compliance with the requirements of this AD." This is a procedural right that allows operators to rely on later SB revisions that have been approved by the relevant authority rather than being locked to Revision 2 only. The AD does not define the approval authority for later revisions, but the phrase establishes flexibility in how compliance can be achieved.

• Implicit accommodation for prior compliance. The Compliance clause acknowledges that if the modification was "already accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD" then the revised compliance date does not require further action. That creates an implicit right to be treated as compliant where the SB work was already completed under the earlier Amendment.

Duties not specified

• The AD does not specify follow-on administrative duties such as mandatory logbook entries, issuance of release to service, notification to CASA, or record-keeping procedures. Those steps are not in the text. The AD also does not specify who pays for parts, labour or aircraft downtime; those obligations remain matters for operators, contracts and commercial arrangements.

Duties removed or altered by amendment

• The Amendment explicitly "removes reference to FAA AD 92-03-05 as a Requirement document" and "redefines the applicability." Those changes alter which external documents are treated as mandatory references and which serials are covered, therefore altering the scope of duty compared to Amendment 1.

In short, the AD requires performance of the SAAB SB actions for the listed aircraft, allows reliance on later approved SB revisions, and ties compliance to a revised compliance date fixed in the text by reference.

The AD text itself does not set out any civil or criminal penalties, nor does it prescribe an enforcement mechanism, fines, or sanctions within the instrument. There are no penalty clauses, infringement notices, or administrative sanction provisions printed in this particular AD. The instrument presents the Requirement and the Compliance obligations and records administrative facts such as effective dates and the delegate's signature, but it does not describe how non-compliance will be sanctioned.

Enforcement in practice is implied through the AD's mandatory status: the Requirement clause converts the SAAB service bulletin into a compulsory action for the listed aircraft. The AD therefore establishes an airworthiness obligation that operators must meet if they wish to maintain the airworthiness certification or the legal status of their aircraft. While the AD does not itself specify enforcement steps, the document functions as a binding regulatory instruction issued by the Civil Aviation Safety Authority through a named delegate, William David.

The absence of explicit penalty text in the AD creates two operational consequences for practitioners reviewing the instrument:

• Unspecified enforcement means operators must consult the broader regulatory framework and the issuing authority for the precise legal consequences of non-compliance. The AD does not identify such consequences within its own text.

• Auditing and oversight practices (for example, surveillance inspections, airworthiness reviews or acceptance of maintenance records) are not described in the AD; however, the AD's mandatory requirement for SB action provides a clear compliance point that regulators and auditors can check.

For those advising operators, the document’s silence on penalties is material: it is necessary to treat the AD’s mandatory technical content as the operative rule, while seeking separate authoritative guidance or statutory references (not contained in this AD) to determine enforcement mechanisms, certificate implications, or sanctions. The AD does record dates, prior AD references and the SB requirement, which auditors can use as objective evidence when assessing whether an aircraft has met the mandated modification.

This AD references, replaces and disclaims certain external airworthiness documents, thereby creating interactions with other authorities’ directives and with the SAAB service bulletin system. The AD itself does not reproduce other laws or set out general legal hierarchy, but the text contains explicit cross-references that determine its relationship with prior directives.

• Swedish AD No. 1-047. The Requirement clause notes: "Note 1: Swedish AD No. 1-047 refers." Earlier in the Amendment history the text states that Amendment 1 replaced Swedish AD No. 1-047 with FAA AD 92-03-05 and SAAB SB 340-33-030 Revision 2 as Requirement documents; however, the present Amendment (Amdt 2) again references Swedish AD No. 1-047 in a note. The exact legal effect is that the present instrument records historical linkage to the Swedish AD but currently prescribes compliance with SAAB SB 340-33-030 Rev 2 (and later approved revisions).

• FAA AD 92-03-05. The background and amendment notes explain that "Amendment 1 of this AD introduced FAA AD 92-03-05 and SAAB SB 340-33-030 Revision 2 as Requirement documents, replacing Swedish AD No. 1-047" and that the present Amendment "removes reference to FAA AD 92-03-05 as a Requirement document." That change severs an explicit reliance on the FAA AD for compliance purposes. Practically, operators who previously relied on FAA AD 92-03-05 for compliance must now ensure they comply with the SAAB SB (Rev 2 or later).

• SAAB-SCANIA AB Service Bulletin SB 340-33-030. The AD delegates the technical requirement to the SAAB service bulletin and explicitly permits the use of "later approved revisions" for compliance. That creates an interface: the AD gives legal force to the SB actions, and subsequent SB revisions , if approved , may be used to satisfy the AD. The approval process for later revisions is not described within the AD.

• Temporal interaction. The AD contains multiple dates: a "revised compliance date of 31 August 1992," an Amendment effective date of 28 January 2010, and a signature date of 30 November 2009, with an original directive effective date of 30 April 1986. These overlapping dates create interactional complexities: operators must determine whether compliance was already completed under previous ADs or Amendments, and whether the timing of required actions has been satisfied historically.

• Delegation. The AD is signed by "William David, Delegate of the Civil Aviation Safety Authority." That indicates the AD is an instrument issued under delegated authority within CASA. The AD therefore interacts with the administrative law processes that govern how CASA issues directives, though those processes are not described in the text.

The AD does not specify how it interacts with other statutory enforcement or aviation safety instruments beyond these references. It therefore creates a focused legal requirement tied to an OEM service bulletin and modifies which external ADs are treated as requirement documents, but it leaves open the detailed interplay with other regulatory statutes, exemptions and enforcement mechanisms which are not contained in this instrument.

The AD records a layered amendment history in the text; those layers should be read as part of how the current requirement evolved.

• Original Directive. The AD notes "Note 2: The original issue of this Directive became effective on 30 April 1986." That records the initial issuance of the directive concerning the SF340 exit and dome lighting.

• Amendment 1. The Background states that "Amendment 1 of this AD introduced FAA AD 92-03-05 and SAAB SB 340-33-030 Revision 2 as Requirement documents, replacing Swedish AD No. 1-047." During Amendment 1 a clarifying Note was also introduced: "Revision 1 of SB 340-33-030 was issued for clarification of the text and correction of part Nos. Revision 2 of SB 340-33-030 was issued to allow certain aircraft to retain the existing emergency dome light bulb." That indicates Amendment 1 both changed the set of documents considered mandatory and recorded technical clarifications and an accommodation in Revision 2 of the SB for certain aircraft.

• Amendment 2 (this instrument). The AD states, regarding this Amendment: "This amendment includes editorial changes, redefines the applicability and removes reference to FAA AD 92-03-05 as a Requirement document." The instrument also specifies that "This Amendment becomes effective on 28 January 2010" and that it is signed by the CASA delegate on 30 November 2009. The header lists "AD/SF340/26 Amdt 2 | Modification of Exit and Dome Light Assemblies | 24/2009," indicating the Amendment’s administrative designation.

• Compliance date information. The Compliance clause refers to "a revised compliance date of 31 August 1992, unless already accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD." That identifies a compliance milestone set by earlier documents and carried forward.

The Amendment history therefore shows progressive refinement and administrative housekeeping: replacement of foreign AD references with an OEM SB requirement (Amendment 1), and then removal of the FAA AD reference plus editorial and applicability redefinition (Amdt 2). The AD text retains historical notes so that a reader can trace what earlier documents had been deemed requirements and what technical accommodations (for example, allowance to retain an existing dome bulb for some aircraft per SB Rev 2) were made during the life of the directive.

Practitioners must therefore treat the present AD as the latest administrative layer: it mandates SB 340-33-030 Rev 2 (or later approved revisions), applies to the listed serial ranges, and supersedes or removes prior references to FAA AD 92-03-05. For aircraft owners, the practical consequence is to verify whether their aircraft were addressed under Amendment 1 or require action under the current AD.

The AD contains no litigation history, case citations, judicial decisions, or references to disputes in its text. There are no named cases, no mention of appeals, and no indication of legal challenges to this directive recorded in the instrument itself. The only external documents referenced are other airworthiness directives (Swedish AD No. 1-047 and formerly FAA AD 92-03-05) and the SAAB service bulletin SB 340-33-030 (Revision 2).

Because the AD does not include any litigation particulars, anyone seeking to determine whether the AD has been the subject of judicial review, administrative appeal, or other disputes must consult external records or repositories beyond this AD. Those materials are not contained within the instrument, and no inference about litigation can be drawn from this text alone.

For practical purposes when advising clients or undertaking compliance reviews, the absence of litigation references in the AD means the document should be treated as a current regulatory instrument without recorded contestation in the text. If legal risk analysis requires an examination of legal challenges or precedent, that material is not in the AD and must be obtained from court or administrative records.

The AD’s brevity and its reliance on external documents create several practical pitfalls that practitioners should verify before concluding an aircraft is compliant.

• Compliance date precedes Amendment effective date. The AD requires compliance "with a revised compliance date of 31 August 1992" yet this Amendment becomes effective on 28 January 2010 and is signed on 30 November 2009. That chronological ordering means operators must check whether the required SB actions were performed historically. The AD acknowledges this possibility by stating "unless already accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD." The practical implication is that aircraft may already have been modified to the AD standard long before the present Amendment; conversely, if work was never done, an operator may now be out of compliance for an action nominally due in 1992.

• Technical detail is in the SAAB SB, not in the AD. The AD mandates "Action in accordance with SAAB-SCANIA AB SB 340-33-030 Revision 2" but does not reproduce the technical steps, parts, or labour requirements. Practitioners should obtain and review SB 340-33-030 Rev 2 (or later approved revisions) to identify exactly what parts, installation instructions, or testing procedures are required. The AD’s permissive clause that later approved revisions are acceptable also means that the technical path to compliance may have changed over time and must be checked against the version used for a given aircraft.

• Applicability redefined. The Amendment "redefines the applicability" compared with previous versions. Operators must verify that their airframe falls within the specific serial-number ranges and any further SB criteria that may narrow or expand applicability. Relying solely on older applicability lists could result in incorrect compliance conclusions.

• Certain aircraft may retain existing dome light bulb. The AD notes that "Revision 2 of SB 340-33-030 was issued to allow certain aircraft to retain the existing emergency dome light bulb." That creates a selective exemption within the SB technical solution: not every aircraft is required to replace the bulb; some may be permitted to keep the existing bulb. Determination of which airframes qualify for that accommodation will be in the SB and must be checked against the aircraft's configuration and serial number.

• Removal of FAA AD as requirement document. Amendment 2 "removes reference to FAA AD 92-03-05 as a Requirement document." For operators who had been relying on the FAA AD to demonstrate compliance across regulatory jurisdictions, that removal changes which external document the Australian AD treats as mandatory. Operators should ensure that compliance paperwork references the SAAB SB (Rev 2 or later approved revision) rather than a removed FAA AD to avoid administrative mismatch.

• No penalties specified. The AD does not state penalty mechanisms or enforcement steps. Practitioners should not assume specific sanction pathways are documented here; instead they should verify regulatory enforcement rules outside this AD.

• Record-keeping and proof of compliance. Because the AD refers to prior Amendments and a historical compliance date, proving compliance for audit or sale requires locating historical maintenance records showing the SB action was performed, demonstrating that it was performed in accordance with the correct SB revision, or demonstrating that later approved revisions were used. The AD does not specify what evidence will be accepted.

• Delegated signature and administrative timing. The AD is signed by a delegate of the Civil Aviation Safety Authority. The lines "This Amendment becomes effective on 28 January 2010" and the signature date "30 November 2009" may differ from operators’ internal compliance timetables; practitioners should reconcile those dates with maintenance scheduling and records.

In short, the principal "gotchas" are temporal sequencing (a compliance date in 1992 vs a 2010 Amendment), dependence on external SB text for technical specifics, selective technical concessions in SB Rev 2 (retention of existing bulbs for certain aircraft), and the need to reconcile previous Amendments and removed external references when assembling compliance proof.

The AD prescribes compliance by reference to an OEM service bulletin and provides limited administrative directions. The following concrete steps, drawn strictly from the AD text, outline what operators and maintainers must do to comply with AD/SF340/26 Amdt 2.

1. Confirm applicability. Verify whether the aircraft is within the serial-number ranges specified: "SAAB SF340A-004 to -159 and SAAB 340B-160 to -179." Also check the SAAB-SCANIA AB Service Bulletin SB 340-33-030 for any additional applicability criteria the SB may include, since the AD ties the applicability "As specified in SAAB-SCANIA AB Service Bulletin (SB) SAAB 340-33-030."

2. Obtain the Requirement document. Acquire SAAB-SCANIA AB SB 340-33-030 Revision 2. The AD expressly requires action "in accordance with SAAB-SCANIA AB SB 340-33-030 Revision 2" and allows "later approved revisions" to be used for compliance. If a later SB revision exists and has been approved, that revision may be used.

3. Check for prior compliance under Amendment 1. The AD notes that compliance may already have been "accomplished in accordance with the above Requirement document as contained in Amendment 1 of this AD." Review historical maintenance and modification records to determine whether the work mandated by SB 340-33-030 was performed previously, and if so, whether it was performed in the required manner.

4. Apply the SB work instructions. Perform the modification of exit and dome light assemblies exactly in accordance with SB 340-33-030 Rev 2 (or a later approved revision). The AD does not reproduce the technical instructions; therefore technicians must follow the SB’s procedural and parts requirements, test procedures, and post-installation checks. Note the SB Rev 2 wording that "allows certain aircraft to retain the existing emergency dome light bulb," and apply that accommodation only where the SB indicates it is permitted.

5. Observe the compliance date reference. The AD specifies a "revised compliance date of 31 August 1992," subject to the caveat about Amendment 1. For current compliance audits, ensure that records demonstrate either that the SB work was completed by that historical date or that the work was completed subsequently and documented in accordance with the SB. The AD's effective date of Amdt 2 is 28 January 2010, but the compliance timeframe remains as stated in the AD text.

6. Record and document. Although the AD does not specify documentation formats, maintain comprehensive records of the SB revision used, parts installed, certificates of release to service, and dates of work. Since the AD may be examined in audits, proof that the SB actions were performed in accordance with the required SB revision (or later approved revision) and that the aircraft falls within the AD’s Applicability is the essential evidence.

7. Retain any approvals for later revisions. If compliance relies on a "later approved revision" of the SB, retain documentation of the approval authority's acceptance of that revision for AD compliance. The AD permits later revisions but does not specify who grants approval; therefore the operator should retain any correspondence or approvals from the relevant airworthiness authority or the SB issuer confirming that the later revision is acceptable.

8. Reconcile applicability changes. Because Amdt 2 "redefines the applicability," confirm whether the current applicability list differs from prior records and whether any airframes previously considered out of scope are now covered, or vice versa. Update aircraft configuration records accordingly.

9. Seek formal clarification where necessary. The AD does not set out enforcement mechanisms, approvals for deviations, or the approval process for later SB revisions. If an operator requires an exemption, alternative method of compliance, or confirmation that a particular SB revision is accepted, they should seek the relevant authority’s formal guidance (the AD names CASA as the issuing authority, evidenced by the signature "William David, Delegate of the Civil Aviation Safety Authority").

10. Maintain an audit trail for audits and transfer events. Given the AD’s historical compliance date and amendment changes, keep documentation that shows either timely historical compliance or subsequent completion of the SB actions, to support future regulatory or commercial transactions (such as sale or lease return).

These steps derive from the AD’s Requirement, Applicability and Compliance clauses and from the Amendment notes. Compliance turns on performing the SAAB SB actions for the specified serials, confirming whether the work was already done under Amendment 1, and retaining documentary evidence that the SB work was performed in accordance with Revision 2 or a later approved revision.