{"id":"F2006B04026","name":"AD/BEECH 55/80 Amdt 1 - Cabin Window Lower and Upper Longerons","slug":"ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43635,"registerId":"commonwealth-F2006B04026-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 55/80 Amdt 1 - Cabin Window Lower and Upper Longerons","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)  \nBeechcraft 55, 58 and 95-55 (Baron) Series Aeroplanes\n\nAD/BEECH 55/80\n\nAmdt 1\n\n  \nCabin Window Lower and Upper Longerons 11/97\n\nApplicability: Models 58P and 58PA aircraft having serial numbers listed in Beechcraft (Beech) Service Bulletin (SB) 2630 or Raytheon SB 2691 Revision 1.\n\nNote: Revision 1 of Raytheon SB 2691 was issued to add serial numbers that were inadvertently omitted from the original issue (now TJ-2 through TJ-121).\n\nRequirement: 1. For aircraft applicable to Raytheon SB 2691 Revision 1:\n\nInspect and reinforce in accordance with Raytheon Aircraft Mandatory SB 2691.\n\n    2. For aircraft applicable to Beech SB 2630:\n\nInspect the cabin window upper longeron (next to the upper aft splice) between the second and third right hand cabin side windows for cracks and missing rivets in accordance with the Accomplishment Instructions section of Beech SB 2630:\n\n    If cracks are found in the upper longeron, repair the cracks in accordance with the Accomplishment Instructions section of Beech SB 2630.\n\n    b. If rivets are found missing, install the rivets in accordance with the Accomplishment Instructions section of Beech SB 2630.\n\nNote: FAA AD 97-09-09 Amdt 39-10005 refers.\n\nCompliance: 1. Within 100 hours’ time in service after 5 December 1996.\n\n2. Unless already accomplished, within 100 hours’ time in service after 9 October 1997.\n\nThe compliance of the initial issue of this Directive remains unchanged as Compliance 1 of this issue.\n\nBackground: The FAA received reports of cracks in the upper and lower longeron near the second right hand cabin window, and missing rivets that are supposed to secure the frame, splice, and longeron together. The actions specified by this Directive are intended to prevent structural cracking to the cabin, which could result in structural failure of the fuselage and loss of the aircraft.\n\nAmendment 1 is issued in response a new FAA AD which combines the requirements of the initial issue of this Directive with additional requirements at the same location.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 expands and clarifies scope by incorporating a new FAA AD that combines the original directive's requirements with additional actions and by adding serial numbers omitted from the original list. It therefore broadens applicability and adds Raytheon SB 2691 Revision 1 inspection/reinforcement requirements (Applicability; Requirement; Background)."},"complexity_factors":["Technical aviation structural terms (upper/lower longeron) requiring specialist inspection/repair skills","Reliance on external mandatory service bulletins (Beech SB 2630; Raytheon SB 2691 Rev 1) for required methods","Applicability limited to specific serial numbers listed in SBs, requiring record checks","Two parallel paths depending on which SB applies (inspect/reinforce vs inspect/repair/install rivets)","Short compliance window (100 hours TIS) creating operational scheduling pressure","Cross-reference to FAA AD increases traceability but requires comparing multiple documents"],"plain_english_summary":"**What it does:** This airworthiness directive orders owners/operators of specified Beechcraft 58P/58PA aeroplanes (serial numbers listed in Beech SB 2630 or Raytheon SB 2691 Rev 1) to inspect and, if needed, reinforce or repair the cabin window upper and lower longerons in accordance with the named service bulletins.  \n\n**Who pays and why it matters:** Operators must complete the mandated inspections/repairs within 100 flight hours and follow the service-bulletin instructions; they bear the time and repair costs and have limited regulatory discretion because the AD prescribes the required actions (Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Amendment 1 maintains the original scope of addressing structural defects in cabin window longerons. It expands the affected aircraft list to include additional serial numbers that were inadvertently omitted from the original service bulletin, but this is a technical correction rather than a scope expansion. The amendment combines requirements from the original directive with a new FAA directive covering the same physical location, which is consolidation rather than scope creep."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 2 defined applicability groups based on service bulletin references","Simple conditional structure: inspect → if cracks found → repair; if rivets missing → install","Two compliance dates with clear 'unless already accomplished' exception","Heavy reliance on external documents (FAA AD 97-09-09, Beech SB 2630, Raytheon SB 2691) for technical details — the directive itself does not contain the actual repair procedures","No nested exceptions or complex cross-referencing within the instrument itself"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators and maintenance engineers of certain Beechcraft Baron 58P/58PA aircraft (specified by service bulletin serial lists) to inspect the upper longeron near right‑side cabin windows, repair any cracks, replace missing rivets, and apply reinforcement per the manufacturer. Required within 100 flight hours after the stated compliance dates, the action prevents possible fuselage failure and in‑flight breakup."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons","history":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons/history","analysis":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons/analysis","conflicts":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons/conflicts","importantCases":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons/important-cases","documents":"/api/acts/ad-beech-55-80-amdt-1-cabin-window-lower-and-upper-longerons/documents"}}