{"id":"F2006B07496","name":"AD/TSA-600/32 Amdt 3 - Flap and C of G Restrictions","slug":"ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49959,"registerId":"commonwealth-F2006B07496-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/32 Amdt 3 - Flap and C of G Restrictions","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)  \nAerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\nAD/TSA-600/32\n\nAmdt 3\n\n  \nFlap and C of G Restrictions 12/84\n\nApplicability: All Piper models PA-60-600, PA-60-601, PA-60-601P and PA- 60-602P and Aerostar models 600, 601, 601P and 602P.\n\nRequirement: Case 1. For an aircraft not fitted with a modification aimed at removing previously imposed flap and C of G restrictions.\n\n    Remove any placard fitted in accordance with the original issue of this Directive.\n\n    b. Fabricate and install a placard in full view of the pilot stating:\n\n“FLAPS MAY BE EXTENDED ONLY IF C OF G IS LESS THAN 4140mm AFT OF DATUM. FLAPS SHALL NOT BE EXTENDED IF C OF G IS MORE THAN 4140mm AFT OF DATUM. LANDING DISTANCE WILL BE INCREASED WITHOUT FLAPS. REFER TO APPROVED FLIGHT MANUAL FOR PERFORMANCE INFORMATION.”\n\nCase 2. For an aircraft fitted with Piper Modification Kit 764969V. Remove any placard fitted in accordance with any issue of this Directive.\n\nCase 3. For an aircraft fitted with Machen Inc. Stall Improvement Kit (STC SA 2143NM). Remove any placard fitted in accordance with any issue of this Directive.\n\nNote 1: Piper Modification 764969V is not approved for aircraft with aerodynamic or power increase modifications.\n\nNote 2: FAA AD 83-14-07 R3 amendment 39-4759 refers.\n\nNote 3: A flight manual amendment was issued concurrently with amendment 1 of this Directive to cover Case 1, and separate flight manual amendments are available to cover Case 2 and Case 3.\n\nCompliance: Case 1 \\- within 100 hours time in service after 31 October 1983.\n\nCase 2 \\- optional.\n\nCase 3 \\- optional.\n\nBackground: When handling deficiencies (loss of yaw and roll control occurring in incipient\n\npower-on stalls with flaps extended and C of G near to aft limit) were highlighted, the FAA imposed an aft C of G limit of 4216mm and prohibited the use of flaps.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nThis restriction was subsequently eased allowing the use of flaps for C of G ahead of a point 4140mm aft of datum, flaps still being prohibited for C of G between 4140mm and 4216mm aft of datum, with a maximum aft limit of 4216mm aft of datum being retained.\n\nSubsequently, for aircraft fitted with either Piper or Machen kits, the FAA has approved the use of flaps for all C of G locations within the approved C of G range (aft limit of 4216 mm for the Piper Kit, aft limit of 4264 mm for the Machen Kit).\n\nThis Amendment authorises the Machen (STC SA 2143 NM) Kit as a means of removing the flap restrictions imposed by the original issue.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains focused on its original purpose: managing flap and centre of gravity restrictions for Aerostar aircraft due to stall handling deficiencies. Amendment 3 simply adds the Machen Inc. kit as an approved modification option alongside the existing Piper kit, without expanding beyond the original safety scope."},"complexity_factors":["Three distinct compliance cases with different requirements","Specific measurement reference (4140mm aft of datum) requiring technical understanding","Cross-reference to FAA AD 83-14-07 R3 amendment 39-4759","Reference to separate flight manual amendments not included in text","Technical note about incompatibility between Piper Modification 764969V and aerodynamic/power increase modifications"],"plain_english_summary":"This mandatory Airworthiness Directive targets certain Piper and Aerostar twin‑engine models because flying with the centre of gravity too far aft and flaps extended can cause loss of control during stalls. It requires operators to install a cockpit placard banning flaps when CG exceeds 4140 mm unless an approved modification is fitted.\n\nApproved Piper or Machen stall‑improvement kits correct the problem and allow removal of the placard. The rule affects owners/operators of specified PA‑60 and Aerostar 600/601 series aircraft."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The Amendment narrows the original blanket flap prohibition by allowing flap use for C of G positions ahead of 4140 mm and by authorising approved modification kits (Piper Mod 764969V and Machen STC SA 2143NM) as means to remove flap restrictions entirely for kit‑fitted aircraft. It therefore changes scope from an unconditional restriction to a conditional regime based on equipment status and approved STCs, and adds an authorised means for relief (This Amendment authorises the Machen (STC SA 2143 NM) Kit; Requirement; Background)."},"complexity_factors":["Multiple conditional cases (Case 1 mandatory placard change; Cases 2 and 3 allow placard removal if specific kits fitted) (Requirement, Compliance).","Technical C of G numeric thresholds that change operational limits (4140 mm, 4216 mm, 4264 mm referenced) (Requirement, Background).","Interaction with approved modifications and supplemental type certificates (Piper Mod 764969V; Machen STC SA 2143NM) and differing aft limits per kit (Requirement, Background).","Cross‑jurisdictional reference to prior FAA AD and concurrent flight manual amendments (Note 2, Note 3, Background).","Compliance timing differences (Case 1 mandatory within 100 hours; Cases 2 and 3 optional) add administrative complexity (Compliance).","Operational consequences spelled out on the placard (increased landing distance without flaps) create direct pilot performance and training implications (Requirement).","Exclusion language limiting approval of a kit for aircraft with other aerodynamic or power increases (Note 1) creates a need for case‑by‑case eligibility checks."],"plain_english_summary":"This Airworthiness Directive for Piper/Aerostar PA‑60/600/700 series aeroplanes requires removal of earlier placards and installation of a new cockpit placard that limits flap use to centre‑of‑gravity (C of G) positions less than 4140 mm aft of datum, unless the aircraft is fitted with certain approved modification kits. It also authorises an additional approved kit as a way to remove the flap restriction.\n\nThe rule affects owners, operators and pilots because it changes when flaps may be extended, warns of increased landing distance without flaps, and sets a 100‑hour compliance window for affected aircraft."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions","history":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions/history","analysis":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions/analysis","conflicts":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions/conflicts","importantCases":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions/important-cases","documents":"/api/acts/ad-tsa-600-32-amdt-3-flap-and-c-of-g-restrictions/documents"}}