{"id":"F2006B04739","name":"AD/BN-2/28 Amdt 1 - Flap Drive Pick-Up Bracket","slug":"ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44503,"registerId":"commonwealth-F2006B04739-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BN-2/28 Amdt 1 - Flap Drive Pick-Up Bracket","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pilatus Britten-Norman BN-2 Series Aeroplanes\n\n \n\nAD/BN-2/28\n\nAmdt 1\n\n\nFlap Drive Pick-Up Bracket 6/93\n\n \n\nApplicability: BN-2 aircraft with flaps not built to Mod NB/M/608 standard.\n\n \n\nRequirement: Inspect the flap drive pick up bracket for cracking in accordance with Pilatus Britten- Norman SB BN-2/70 Issue 2.\n\n \n\nCompliance: At intervals not exceeding five years time in service. The previous issue of this directive became effective on 31 December 1973, this amendment is effective from 27 May 1993.\n\n \n\nBackground: Cracking of the flap drive pick up bracket has been discovered by the manufacturer, who introduced an inspection of all flaps every 1000 hours. This amendment exempts flaps built to Mod NB/M/608 standard and relaxes the interval for earlier flaps to every five years.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor amendment to an existing Airworthiness Directive. The original AD required inspections every 1,000 hours. Amendment 1 relaxed this to every 5 years and added an exemption for modified flaps. The scope remains tightly focused on the specific safety issue (bracket cracking) and has not expanded beyond its original purpose."},"complexity_factors":["Single, specific mechanical component addressed (flap drive pick-up bracket)","Only one exemption criterion (Mod NB/M/608 standard)","Simple compliance schedule (5-year intervals)","No defined terms section or interpretation provisions","No cross-references to other legislation beyond the manufacturer's service bulletin","Straightforward applicability test (aircraft model + flap modification status)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Pilatus Britten‑Norman BN‑2 series aircraft to inspect the flap drive pick‑up bracket for cracks per Service Bulletin SB BN‑2/70 Issue 2, with inspections every five years. Aircraft fitted with the Mod NB/M/608 flap design are exempt. The AD prevents potential flap failure on landing while easing burden for upgraded aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The amendment narrows scope by exempting flaps built to Mod NB/M/608 and relaxes the inspection frequency for other BN‑2 aircraft from the manufacturer's 1,000‑hour practice to a five‑year interval, reducing recurring inspections for modified aircraft and lowering inspection frequency for remaining aircraft."},"complexity_factors":["Conditional applicability tied to a specific modification status (Mod NB/M/608) which bifurcates compliance obligations","Mandated inspection procedure is external: Pilatus Britten‑Norman SB BN‑2/70 Issue 2 (requires access to and reliance on manufacturer material)","Time‑based compliance interval (five years) replaces prior flight‑hour‑based practice (1,000 hours), affecting planning and record systems","Technical inspection for cracking requires access to aircraft components and qualified personnel (operational cost and downtime)","Amendment history and effective dates create transitional compliance considerations for operators","Low legal ambiguity in required action (inspect for cracking) but operational interpretation of SB may vary"],"plain_english_summary":"Requires inspection of the flap drive pick‑up bracket for cracking on Pilatus Britten‑Norman BN‑2 aircraft whose flaps are not built to Mod NB/M/608, using Pilatus SB BN‑2/70 Issue 2, at intervals not exceeding five years. The amendment exempts Mod NB/M/608 flaps and replaces the earlier 1,000‑hour manufacturer inspection with a five‑year interval; operators bear inspection costs, must schedule and record checks, and have an incentive to adopt Mod NB/M/608 to avoid recurring inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket","history":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket/history","analysis":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket/analysis","conflicts":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket/conflicts","importantCases":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket/important-cases","documents":"/api/acts/ad-bn-2-28-amdt-1-flap-drive-pick-up-bracket/documents"}}