{"id":"F2006B02925","name":"AD/B737/23 Amdt 3 - Forward Service Doorway Aft Frame","slug":"ad-b737-23-amdt-3-forward-service-doorway-aft-frame","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42267,"registerId":"commonwealth-F2006B02925-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/23 Amdt 3 - Forward Service Doorway Aft Frame","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/23\n\nAmdt 3\n\n  \nForward Service Doorway Aft Frame 1/99\n\nApplicability: Model 737 series aircraft, as listed in Boeing Service Bulletin 737-53A1108, Revision 5, dated October 26, 1989.\n\nRequirement: Perform visual inspection in accordance with the technical requirements of FAA AD 98-22-10 Amdt 39-10858.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 28 January 1999.\n\nThis Amendment becomes effective on 28 January 1999.\n\nBackground: Four operators reported cracks on eleven aircraft with 19,200 to 51,300 flight cycles. Two adjacent cracked door stops could result in door deflection with possible major structural damage and loss of pressurisation. Amendment 1 clarified terminating action for the inspections. Amendment 2 reduced the inspection threshold to be consistent with the cracking history.\n\nAmendment 3 is issued in response to a new FAA AD prompted by reports that repetitive inspections required by the existing FAA AD may not detect cracking of the aft frame and aft frame support structure of the forward service doorway in a timely manner. The initial inspection and repetitive inspection intervals are reduced, certain repetitive inspections are added, and provision is made for optional terminating action for the repetitive inspection requirements.\n\nAmendment 2 of this Airworthiness Directive became effective on 28 December 1989.\n\nAmendment 1 of this Airworthiness Directive became effective on 2 November 1989.\n\nThe original issue of this Airworthiness Directive became effective on 10 August 1989.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1948},"content_quality":"ok","complexity_score":3,"rejection_reason":"","scope_assessment":{"changed":false,"description":"The directive maintains its original focus on ensuring the structural integrity of the forward service doorway aft frame on Boeing 737 aircraft. Amendment 3 tightens safety requirements (reducing inspection intervals) based on new evidence that cracks were not being detected promptly, but does not expand the scope beyond the original airworthiness concern."},"complexity_factors":["Requires cross-referencing external technical documents (FAA AD 98-22-10 and Boeing Service Bulletin 737-53A1108 Rev 5) for actual inspection procedures","Contains multiple amendment layers (Amendments 1, 2, and 3) with different compliance dates and thresholds","Uses technical aviation terminology (flight cycles, door stops, pressurisation, terminating action)","Specifies conditional compliance pathways (ongoing repetitive inspections versus optional terminating action)"],"plain_english_summary":"This directive requires operators of certain Boeing 737s to perform frequent visual inspections of the forward service door frame for cracks that could cause door distortion, major structural damage, or sudden decompression.  \n\nAmendment 3 shortens initial deadlines and inspection intervals because cracks developed faster than before, and gives airlines the option to install permanent repairs to end repetitive inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame","history":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame/history","analysis":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame/analysis","conflicts":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame/conflicts","importantCases":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame/important-cases","documents":"/api/acts/ad-b737-23-amdt-3-forward-service-doorway-aft-frame/documents"}}