{"id":"F2007L00752","name":"AD/B737/174 Amdt 2 - Shoulder Restraint of Attendant or Observers Seat","slug":"ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64441,"registerId":"commonwealth-F2007L00752-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/174 Amdt 2 | Shoulder Restraint of Attendantor Observers Seat | 4/2007 |\n| ------------------ | ------------------------------------------------ | ------ |\n\n| Applicability: | Boeing 737-200, -200C, -300, -400, and -500 series aircraft as listed in Boeing Service Bulletin 737-25-1412 Revision 3.                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2006-26-13 Amdt 39-14871.Note: Boeing Service Bulletin 737-25-1412 Revision 3, dated 2 December 2004 refers.                                                                                                                                                                                                                                                                                                                                                                                  |\n| Compliance:    | For aircraft identified in FAA AD 2006-26-13 Amdt. 39-14871 paragraph (f), before 21 March 2005. The compliance date remains unchanged from the original issue of the Airworthiness Directive.For aircraft identified in FAA AD 2006-26-13 Amdt. 39-14871 paragraph (i), as specified in the Requirement document with a revised effective date of 12 April 2007.                                                                                                                                                                                            |\n|                | This Amendment becomes effective on 12 April 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | The FAA requires inspection and, if necessary, corrective action to prevent detachment of the shoulder restraint harness of the attendant or observer seat from its mounting bracket during service, which could result in injury to the occupant.Amendment 1 added aircraft to the applicability with a separate compliance date.This amendment corrects an erroneous document reference.Amendment 1 of this Airworthiness Directive became effective on 15 March 2007.The original issue of this Airworthiness Directive became effective on21 March 2002. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 February 2007","sortOrder":0},{"sectionNumber":"AD/B737/174 Amdt 2","sectionType":"part","heading":"AD/B737/174 Amdt 2","content":"## AD/B737/174 Amdt 2","sortOrder":1},{"sectionNumber":"Shoulder Restraint of Attendantor Observ","sectionType":"part","heading":"Shoulder Restraint of Attendantor Observers Seat","content":"## Shoulder Restraint of Attendant  \nor Observers Seat","sortOrder":2},{"sectionNumber":"4/2007","sectionType":"part","heading":"4/2007","content":"## 4/2007","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment (Amdt 2) does not substantially change the original safety purpose of the AD. The core obligation—inspect and, if necessary, correct the shoulder restraint mounting—remains the same. Amendment 1 expanded applicability by adding aircraft (a broadening that affects scope), but Amdt 2 itself is primarily an administrative correction to a document reference and a revision of an effective/compliance date rather than a further substantive expansion of regulatory scope."},"complexity_factors":["Cross-reference to FAA AD 2006-26-13 Amdt. 39-14871 instead of self-contained technical mandates","Reliance on Boeing Service Bulletin 737-25-1412 Revision 3 for exact applicability rather than listing serials in the AD","Two different compliance timetable treatments (paragraph (f) items vs paragraph (i) items) creating conditional compliance dates","Amendment history (original AD, Amendment 1 adding aircraft, Amendment 2 correcting document reference) introduces tracking overhead","Potential ambiguity arising from an external document reference that had to be corrected (administrative complexity)"],"plain_english_summary":"**What this instrument does (mechanical effect)**\n\n- It is an Airworthiness Directive (AD) that applies to certain Boeing 737-200, -200C, -300, -400 and -500 series aeroplanes as listed in Boeing Service Bulletin 737-25-1412 Revision 3. (Applicability)\n- It requires operators to carry out the inspection and, if necessary, corrective action that the FAA mandated in FAA AD 2006-26-13 Amdt. 39-14871. That action is aimed at preventing the shoulder restraint harness of the attendant or observer seat from detaching from its mounting bracket. (Requirement)\n- The AD sets specific compliance deadlines: aircraft identified in paragraph (f) of the FAA AD had to comply before 21 March 2005; aircraft identified in paragraph (i) of the FAA AD must comply as specified in the Requirement document with a revised effective date of 12 April 2007. This amendment (Amdt 2) is effective 12 April 2007. (Compliance)\n\n**Who this affects**\n\n- Airline and charter operators that own or operate the listed Boeing 737 series (they must schedule and pay for inspections and any repairs). (Applicability)\n- Maintenance organisations and approved engineers who perform the inspections and repairs (they must follow the FAA AD and Boeing service bulletin procedures). (Requirement)\n- The Civil Aviation Safety Authority (CASA) as the enforcing regulator (CASA issues the AD and monitors compliance). (General)\n\n**Why it matters (stated purpose and operational effect)**\n\n- Stated purpose: to prevent detachment of the shoulder restraint harness on attendant/observer seats, which could cause injury to the seat occupant during service. (Background)\n- Operational effect: requires operators to allocate maintenance time and parts to inspect and, if needed, repair or modify the restraint attachment. If an operator does not comply, the aircraft may be considered unairworthy for the affected configuration and will be subject to enforcement action by CASA. (Requirement & Compliance)\n\n**Practical consequences, costs and incentives**\n\n- Who pays: the aircraft operator pays for inspection labour, replacement parts, any modifications, and aircraft downtime while work is done. (Requirement/Compliance)\n- Who decides how to comply: operators and their approved maintenance organisations decide scheduling and which approved repair/installation method to use, but they must follow the FAA AD and Boeing service bulletin referenced by the AD. (Requirement)\n- Compliance burden: inspections and corrective work create direct costs (parts, labour) and indirect costs (aircraft out of service, administrative record-keeping). The AD ties compliance to external documents (FAA AD and Boeing service bulletin), so operators must obtain and follow those documents. (Requirement/Applicability)\n- Implementation risk and ambiguity: because the applicability is defined by a Boeing service bulletin (rather than listing each serial number in the AD itself) and the AD cross-references FAA material, there is some practical dependency on the accuracy and availability of those external documents. This amendment corrects an erroneous document reference, which reduces ambiguity. (Background)\n\n**Trade-offs and effects on private choice and markets**\n\n- Safety versus cost: the directive imposes a safety-motivated inspection and possible repair obligation on operators, increasing maintenance costs and potential downtime. That cost is concentrated on the operators of the affected aircraft; the safety benefit (reduced risk of occupant injury) is diffuse. (Requirement/Background)\n- Competitive effects: all operators of the affected fleet face the same regulatory obligation; however, relative burden varies by fleet size and maintenance capacity—smaller operators may face proportionally larger operational disruption. (Applicability/Compliance)\n\n**Amendment history and purpose-claims**\n\n- The AD originated to implement the FAA requirement to inspect and fix the restraint mounting bracket. Amendment 1 previously added aircraft to the applicability with a separate compliance date. This Amendment 2 mainly corrects an erroneous document reference and sets the revised effective date of 12 April 2007 for the specified paragraph. Those are administrative and timing corrections rather than the introduction of new substantive obligations. (Background)\n\n**Bottom line (plain)**\n\n- If you operate one of the listed Boeing 737 types, you must follow the inspection and repair actions set out in FAA AD 2006-26-13 and the Boeing service bulletin cited. Expect inspection costs, possible repair costs, and aircraft downtime. The AD exists to reduce the risk of a shoulder restraint detaching from its mounting bracket and potentially injuring an attendant or observer. (Requirement/Applicability/Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose: ensuring shoulder restraints on attendant/observer seats in specific Boeing 737 models are secure. Amendment 2 is purely corrective — it fixes an erroneous document reference without expanding applicability or adding new requirements. The scope has not grown beyond the original safety intent."},"complexity_factors":["Short, single-purpose instrument (approximately 250 words)","Only 5 defined applicability criteria (specific aircraft models)","Heavy reliance on external documents (FAA AD 2006-26-13 and Boeing Service Bulletin 737-25-1412 Revision 3) — operators must cross-reference these to understand full requirements","Two-tier compliance structure with different deadlines for different aircraft groups (paragraphs f and i of the FAA AD)","Amendment history creates some confusion (references to Amendment 1, original issue, and multiple effective dates)","Contains formatting artifacts and repetition suggesting PDF conversion issues"],"plain_english_summary":"This AD mandates inspection of flight attendant and observer shoulder harnesses on certain older Boeing 737s (-200/200C/300/400/500) and requires repair or replacement of faulty harness mounting brackets to prevent detachment in turbulence or emergencies. \n\nAmendment 2 corrects a paperwork reference in the earlier version; operators in Australia must follow the FAA 2006 directive and Boeing’s service bulletin for compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat","history":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat/history","analysis":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat/analysis","conflicts":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat/conflicts","importantCases":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat/important-cases","documents":"/api/acts/ad-b737-174-amdt-2-shoulder-restraint-of-attendant-or-observers-seat/documents"}}