{"id":"F2006B02819","name":"AD/B737/117 - Main Cargo Door","slug":"ad-b737-117-main-cargo-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42161,"registerId":"commonwealth-F2006B02819-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/117 - Main Cargo Door","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/B737/117 Main Cargo Door 6/98\n\nApplicability: Model 737-200 and \\-300 series aircraft equipped with a main deck cargo door installed in accordance with Supplemental Type Certificate SA2969SO.\n\nRequirement: Perform a detailed visual inspection to detect cracks in the hinge and lift actuator box area of the main deck cargo door and upper jamb of the fuselage. Pay particular attention to the upper frame of the fuselage and upper jamb frames of the main deck cargo door, primary longeron, and clips of the fuselage, primarily in the hinge and lift actuator box area. If any crack is detected, replace the cracked part with a new part having the same part number.\n\nNote: FAA AD 98-04-41 Amdt 39-10352 refers.\n\nCompliance: Before 31 May 1998, and thereafter at intervals not to exceed 600 flight cycles.\n\nThis airworthiness directive becomes effective on 21 May 1998.\n\nBackground: The FAA received reports of cracks found during a heavy maintenance check; in the upper jamb area of the fuselage and in the main deck cargo door. Unchecked cracking could result in reduced structural integrity of the main cargo door and/or fuselage, and consequent loss or opening of the main deck cargo door while the aircraft is in flight.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive addressing a specific safety issue with a specific aircraft modification. It has not expanded beyond its original purpose of mandating inspections for cargo door cracks."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (Supplemental Type Certificate)","Single, straightforward requirement with clear compliance deadline","No cross-references to other legislation beyond a non-binding note about the corresponding FAA directive","Simple conditional logic: 'If crack found → replace part'","No nested exceptions or layered conditions"],"plain_english_summary":"This mandatory safety order requires operators of Boeing 737‑200 and 737‑300 aircraft fitted with the main‑deck cargo door under STC SA2969SO to inspect the cargo door and surrounding fuselage (hinges and lifting mechanisms) for cracks, replace any cracked parts with new ones, and repeat inspections every 600 flight cycles. Issued after maintenance found cracks, it prevents possible in‑flight cargo door failure; the first inspection was due before 31 May 1998."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to the specified 737 models fitted under STC SA2969SO and imposes inspection and replacement requirements consistent with the FAA AD referenced in the note. It does not expand applicability beyond those aircraft or add new types of structural requirements beyond detecting and replacing cracks in the identified areas."},"complexity_factors":["Narrow applicability: limited to Boeing 737-200 and -300 aircraft fitted with the main deck cargo door under Supplemental Type Certificate SA2969SO.","Technical focus: inspection targets specific structural locations (hinge and lift actuator box area, upper jamb, upper frame, primary longeron, and clips).","Mandatory corrective action: any detected crack requires replacement with a new part having the same part number.","Fixed compliance schedule: initial inspection required before 31 May 1998 and recurring inspections at intervals not to exceed 600 flight cycles.","Regulatory linkage: note references FAA AD 98-04-41, indicating alignment with an existing FAA airworthiness directive.","Operational impact: recurring inspections and potential part replacements impose maintenance downtime and direct costs on aircraft operators."],"plain_english_summary":"This airworthiness directive requires operators of Boeing 737-200 and -300 aeroplanes fitted with a main deck cargo door under STC SA2969SO to carry out detailed visual inspections of the cargo door hinge, lift-actuator box and adjacent upper jamb/fuselage frames and to replace any cracked part with a part of the same part number. Inspections must be done before 31 May 1998 and thereafter at intervals not to exceed 600 flight cycles. It matters because undetected cracking could reduce structural integrity and risk in-flight opening or loss of the main cargo door; operators bear inspection and replacement costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-117-main-cargo-door","history":"/api/acts/ad-b737-117-main-cargo-door/history","analysis":"/api/acts/ad-b737-117-main-cargo-door/analysis","conflicts":"/api/acts/ad-b737-117-main-cargo-door/conflicts","importantCases":"/api/acts/ad-b737-117-main-cargo-door/important-cases","documents":"/api/acts/ad-b737-117-main-cargo-door/documents"}}