{"id":"F2006B05541","name":"AD/PA-24/42 - Flap Extension Limitation - Warning Placard","slug":"ad-pa-24-42-flap-extension-limitation-warning-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46462,"registerId":"commonwealth-F2006B05541-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-24/42 - Flap Extension Limitation - Warning Placard","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)  \nPiper PA-24 (Comanche) Series Aeroplanes\n\nAD/PA-24/42 Flap Extension Limitation \\- Warning Placard 6/83\n\nApplicability: Models PA-24, PA-24-250, PA-24-260 series which have been modified in accordance with FAA Supplemental Type Certificate SA2495WE (Robertson STOL modification kit).\n\nRequirement: 1. To prevent possible loss of aeroplane control due to an asymmetric flap extension or retraction, install a placard on the panel near the flap actuator which reads:\n\n“DO NOT EXTEND FLAPS BEYOND 15 DEGREES (TAKEOFF POSITION)”.\n\n2. The placard may be removed when a positive flap retraction system is installed in accordance with Robertson Aircraft Corporation Service Bulletin 19 dated 22 October 1982.\n\nNote: FAA AD 82-23-01 refers.\n\nCompliance: Within 25 hours time in service after 16 May 1983.\n\nBackground: An accident investigation has shown that a loss of aeroplane lateral control can occur if an asymmetric flap condition is allowed to develop, in subject aircraft fitted with the Robertson STOL modification kit. A Robertson Service Bulletin has been issued in order to overcome the problem.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific safety defect in a specific aircraft type with a specific modification. The instrument has not expanded beyond its original purpose of preventing asymmetric flap accidents in Robertson STOL-modified PA-24 series aircraft."},"complexity_factors":["Single, specific aircraft modification (Robertson STOL kit) triggers applicability","Only one substantive requirement (install placard) with one alternative compliance path (install positive flap retraction system)","No defined terms section or complex cross-referencing within the instrument itself","Simple conditional logic: placard required unless alternative mechanical fix installed","Short document (approximately 150 words) with clear, directive language","Single external reference (FAA AD 82-23-01) provided as background only"],"plain_english_summary":"Owners/operators of Piper PA-24, PA-24-250, and PA-24-260 Comanche aircraft modified with the Robertson STOL kit (STC SA2495WE) must install a placard by the flap controls reading “DO NOT EXTEND FLAPS BEYOND 15 DEGREES (TAKEOFF POSITION)” to prevent asymmetric flap extension that can cause loss of control.  \n\nThis mandatory interim measure must be complied with within 25 flight hours after 16 May 1983 and may be removed once the permanent positive flap retraction system per Robertson Service Bulletin 19 is installed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains narrowly targeted to the identified PA‑24 series with the Robertson STOL modification and prescribes a limited interim operational restriction (placard) with option to remove only after a specific retrofit; it does not expand to other types or mandate broader design changes."},"complexity_factors":["Narrow applicability: limited to PA‑24, PA‑24‑250, PA‑24‑260 aircraft modified by FAA STC SA2495WE (Applicability).","Simple corrective action: install a single warning placard adjacent to the flap actuator (Requirement 1).","Conditional removal: placard may be removed only after a retrofit (positive flap retraction system) per Robertson Service Bulletin 19 (Requirement 2).","Clear compliance deadline: 25 hours time‑in‑service after 16 May 1983 (Compliance).","Cross‑reference to FAA AD 82‑23‑01 and Robertson Service Bulletin informs conformity and technical detail (Note; Background).","Low technical implementation burden but imposes an immediate compliance and minor cost on aircraft owners/operators (implied by Requirement and Compliance)."],"plain_english_summary":"Requires owners/operators of Piper PA‑24, PA‑24‑250 and PA‑24‑260 aeroplanes modified by FAA STC SA2495WE (Robertson STOL kit) to install a cockpit placard beside the flap actuator reading “DO NOT EXTEND FLAPS BEYOND 15 DEGREES (TAKEOFF POSITION)” (Requirement 1). The placard may be removed only after installing a positive flap retraction system per Robertson Service Bulletin 19 (Requirement 2). Purpose is to reduce the risk of loss of lateral control from asymmetric flap movement; compliance was required within 25 hours TIS after 16 May 1983."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard","history":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard/history","analysis":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard/analysis","conflicts":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard/conflicts","importantCases":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard/important-cases","documents":"/api/acts/ad-pa-24-42-flap-extension-limitation-warning-placard/documents"}}