{"id":"F2006B10552","name":"AD/HS 748/18 Amdt 1 - Elevator Outboard Hinge Structure","slug":"ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116367,"registerId":"commonwealth-F2006B10552-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/18 Amdt 1 - Elevator Outboard Hinge Structure","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)  \nBritish Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\nAD/HS 748/18\n\nAmdt 1\n\n  \nElevator Outboard Hinge Structure 2/98\n\nApplicability: All HS748 aircraft fitted with elevators P/N 1G3096 and 400G3096.\n\nRequirement: 1. (a). Visually inspect, both internally and externally, each elevator in the region of the outboard hinge for repairs or existing damage. Inspect in accordance with British Aerospace Mandatory Service Bulletin (MSB) 55/24, Part 2.A.\n\n    (b). For repaired elevators, before the initial inspection, incorporate access panel E11 in accordance with British Aerospace MSB 55/24, Part 2.B.\n\nVisually inspect, both internally and externally, each repaired elevator in the region of the outboard hinge for cracking, loose rivets and buckling.\n\nInspect in accordance with British Aerospace MSB 55/24, Part 2.B.\n\n    2. For all elevators, perform a close visual internal inspection in accordance with British Aerospace MSB 55/24, Part 2.C.\n\nNote: CAA (UK) AD 003-04-87 refers.\n\nCompliance: 1. Initially inspect all elevators in accordance with Requirement 1.(a) and, if repaired, Requirement 1.(b) before 25 June 1995.\n\n2. Initially inspect all elevators in accordance with Requirement 2 before 5000 hours time in service or 7000 landings, whichever occurs first.\n\nRepeat at intervals not to exceed 5000 hours time in service or 7000 landings, whichever occurs first.\n\nThe compliance of the original issue is changed with respect to the initial and repeat inspection periods, to align with the CAA (UK) AD.\n\nThis amendment becomes effective on 29 January 1998.\n\nBackground: An incident has been reported in which an aircraft lost the outboard section of the elevator in flight. The failure originated from damage associated with an earlier incident. Examination of other undamaged elevators indicated loose rivets cracking and wear in the subject area.\n\nAmendment 1 is issued to correct an anomaly in the compliance initial and repetitive inspection periods.\n\nThe original issue of this airworthiness directive became effective on 25 May 1995.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The amendment alters the initial and repetitive inspection periods to align with the CAA (UK) AD. It therefore changes the timing obligations from the original 25 May 1995 issue (original compliance) to the amended schedule (effective 29 January 1998), but does not expand the population of affected aircraft (still limited to HS748 with elevators P/N 1G3096 and 400G3096)."},"complexity_factors":["Multiple inspection types (external/internal visual, close internal) with different triggers (Requirement 1(a)/(b) and Requirement 2).","Cross-references to British Aerospace Mandatory Service Bulletin 55/24 (Parts 2.A, 2.B, 2.C) for procedures and to CAA (UK) AD (Note) increase procedural dependency on external documents.","Different compliance deadlines: an earlier date for Requirement 1 inspections (before 25 June 1995) and time-in-service/landings thresholds for Requirement 2 (initial and repetitive: 5000 hours or 7000 landings), creating mixed temporal metrics and recordkeeping burden (Compliance).","A one-time modification requirement for repaired elevators (incorporate access panel E11 per MSB Part 2.B) imposes a discrete maintenance cost and scheduling decision on operators (Requirement 1(b)).","Amendment changes prior compliance periods (Background/Compliance), requiring operators to reconcile original and amended schedules and potentially re-plan maintenance cycles.","Safety consequence is concrete (reported in Background: in-flight loss originating from prior damage), so non-compliance carries direct operational risk and regulatory exposure."],"plain_english_summary":"This amendment requires operators of HS 748 aircraft fitted with elevator parts P/N 1G3096 or 400G3096 to carry out specified visual inspections of the outboard hinge area, fit an access panel to repaired elevators, and follow repeat inspection intervals measured in hours or landings. It adjusts the initial and recurring inspection timing to align with the UK CAA AD. The change matters because it targets damage that has led to in‑flight loss of an elevator section; aircraft owners/operators pay for inspections and any panel installation."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope — safety inspections of elevator hinge structures on HS 748 aircraft. Amendment 1 only corrects the inspection intervals (timing) to match the UK aviation authority's directive. It does not expand the aircraft covered, the parts inspected, or the nature of the inspections required."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 2 defined part numbers in applicability section","Clear sequential requirements (1a, 1b, 2) with minimal cross-referencing","Single external reference to British Aerospace MSB 55/24 (referenced 4 times but consistently)","Simple compliance structure with specific deadlines and recurring intervals","No nested exceptions or conditional logic beyond 'if repaired' qualifier","Background section provides clear rationale without legal obfuscation"],"plain_english_summary":"This safety order requires operators of British Aerospace HS 748 aircraft with elevator P/N 1G3096 or 400G3096 to perform careful visual and internal inspections of the elevator hinge and structure for repairs, cracks, loose rivets, buckling, and wear, and to fit special access panels on previously repaired elevators so interiors can be checked.  \n\nInspections use a close-visual method, began with an initial deadline (June 1995) and repeat every 5,000 flight hours or 7,000 landings, to prevent in‑flight elevator failure and loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure","history":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure/history","analysis":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure/analysis","conflicts":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure/conflicts","importantCases":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure/important-cases","documents":"/api/acts/ad-hs-748-18-amdt-1-elevator-outboard-hinge-structure/documents"}}