{"id":"F2006B09082","name":"AD/DHC-3/32 Amdt 1 - Utility Seat Forward Leg Positive Lock Installation","slug":"ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115635,"registerId":"commonwealth-F2006B09082-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/32 Amdt 1 - Utility Seat Forward Leg Positive Lock Installation","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)  \nDHC-3 (Otter) Series Aeroplanes\n\nAD/DHC-3/32\n\nAmdt 1\n\n  \nUtility Seat Forward Leg Positive Lock Installation 11/88\n\nApplicability: All models with side folding cabin utility seats.\n\nRequirement: Action in accordance with De Havilland Canada SB 3/42 Rev A.\n\nCompliance: 1. Prior to the issue of the next Maintenance Release after 31 December 1987 and thereafter at each inspection for Maintenance Release issue until modified as detailed in SB 3/42 Rev A.\n\n2. After each time the seats are moved from stowed to deployed position, until modified as above.\n\nNote 1. This Compliance Para 2 inspection may be accomplished by the Pilot-In- Command, in which case the precise AD reference shall be entered in a certification made on the Maintenance Release.\n\nNote 2. Canadian AD CF-85-03 R1 and FAA AD 88-15-08 refer.\n\nBackground: A sideways force applied to a utility seat forward leg could result in the leg being disengaged from the keyhole slot in the seat rail. Amendment 1 requires repeat inspection each time seats are deployed. SB 3/42 Rev A refers.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amendment 1) to an existing Airworthiness Directive. The amendment adds a requirement for repeated inspections each time seats are deployed, but this is a refinement of the original safety purpose rather than an expansion beyond it. The scope remains tightly focused on the specific seat locking defect in DHC-3 aircraft."},"complexity_factors":["Single, specific aircraft type (DHC-3 Otter)","Single mechanical issue (seat leg locking mechanism)","Only 2 compliance pathways (inspection schedule and pilot-performed check)","Minimal defined terms (relies on external references like 'Maintenance Release' and 'Service Bulletin')","No nested exceptions or conditional logic","Short document (approximately 150 words)","Straightforward temporal trigger (dates and maintenance events)"],"plain_english_summary":"This AD mandates inspections and eventual modification of side-folding utility seats on De Havilland DHC-3 Otters because the forward legs can pop out and cause in-flight collapse. Owners/operators must inspect leg locking before the next Maintenance Release after 31 Dec 1987 and at each renewal, and check each time seats are unfolded.\n\nThe pilot-in-command may perform the post-deployment check but must record the AD reference on the Maintenance Release; permanent modification per the manufacturer’s service bulletin is required."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 extends the original directive by adding a repeat inspection requirement each time the utility seat is deployed, until the positive lock modification is installed, and explicitly allows the Pilot‑In‑Command to carry out that interim inspection provided the AD reference is entered on the Maintenance Release."},"complexity_factors":["Direct technical action: install positive lock per a specific manufacturer service bulletin (SB 3/42 Rev A).","Two compliance triggers: (a) at next Maintenance Release after 31 Dec 1987 and thereafter at each Maintenance Release inspection until modification; (b) after every deployment of the seat until modification.","Permits pilot to perform the post‑deployment inspection but requires a precise AD reference entry on the Maintenance Release, adding a procedural certification step.","Cross‑references to foreign ADs (Canadian CF‑85‑03 R1 and FAA 88‑15‑08) increase administrative tracing but do not change domestic mechanics.","Operational impact concentrated on aircraft with the affected seats: recurring inspection burden until modification and one‑off cost/time to fit the positive lock."],"plain_english_summary":"This directive requires owners/operators of DHC‑3 Otter aeroplanes with side‑folding cabin utility seats to install a positive lock (per De Havilland Canada SB 3/42 Rev A) and, until the lock is fitted, inspect the seat forward leg each time the seat is moved from stowed to deployed. It matters because a sideways force can disengage the leg from its rail keyhole slot, so the rule forces repeat checks and eventual modification to reduce that risk.\n\nOwners pay for the modification; pilots or maintenance certifiers must perform and record the interim inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation","history":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation/history","analysis":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation/analysis","conflicts":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation/conflicts","importantCases":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation/important-cases","documents":"/api/acts/ad-dhc-3-32-amdt-1-utility-seat-forward-leg-positive-lock-installation/documents"}}