{"id":"F2006B07051","name":"AD/SM-205/29 Amdt 1 - Propeller Governor Arm - Inspection and Replacement","slug":"ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48778,"registerId":"commonwealth-F2006B07051-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-205/29 Amdt 1 - Propeller Governor Arm - Inspection and Replacement","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)  \nSIAI Marchetti S205 and S208 Series Aeroplanes\n\nAD/SM-205/29\n\nAmdt 1\n\n  \n\nPropeller Governor Arm \\- Inspection and Replacement\n\n  \n12/94\n\nApplicability: S205 Series aircraft with S/Nos. up to and including 5-406, and S208 Series aircraft with S/Nos. up to and including 4-64.\n\nRequirement: Inspect the propeller governor arm in accordance with SIAI MARCHETTI Service Bulletin 205B43A.\n\nFitment of steel governor arm, P/No. 260-13-274-01, as per paragraph “C” of SB 205B43A is terminating action for this Directive.\n\nNote: Italian AD 77-222 also refers.\n\nCompliance: Unless previously accomplished, within 25 hours time in service from 10 November 1994, and thereafter at intervals not exceeding 50 hours time in service.\n\nBackground: Cracking of the propeller governor arm has been reported.\n\nFailure of the governor arm will result in loss of propeller control.\n\nThis AD has been revised to clarify aircraft model applicability and re-formatted per the latest requirements.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment states it was revised to clarify aircraft model applicability and re-formatted per current requirements. The instrument therefore changes presentation and clarity of which serial-numbered S205/S208 aircraft are covered, but the substantive requirement — inspect per SB 205B43A and option to fit the steel governor arm as terminating action — is retained."},"complexity_factors":["Targeted applicability by aircraft model and serial-number ranges (Applicability).","Mandatory action tied to an external document: Service Bulletin 205B43A (Requirement).","Specified terminating action with exact part number for replacement (Fitment of steel governor arm, P/No. 260-13-274-01).","Short initial compliance window (25 hours from 10 Nov 1994) and frequent recurring interval (every 50 hours) creating operational scheduling burden (Compliance).","Safety-critical failure consequence (loss of propeller control) increases enforcement priority (Background).","Revision limited to clarification of model applicability and reformatting, not to the substantive inspection/replacement requirement (Revision note).","Cross-reference to a foreign AD (Italian AD 77-222) introduces potential for parallel regulatory references (Note)."],"plain_english_summary":"Requires inspection of the propeller governor arm on specified SIAI Marchetti S205 (S/Ns up to 5-406) and S208 (S/Ns up to 4-64) aircraft per SIAI MARCHETTI Service Bulletin 205B43A, and allows fitting a steel governor arm (P/No. 260-13-274-01) as terminating action. Initial compliance is within 25 hours time in service from 10 November 1994, then every 50 hours. The AD responds to reported cracking because failure can cause loss of propeller control; owners/operators must pay for and carry out inspections and any replacement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment makes no substantive change to scope. It merely clarifies aircraft model applicability and updates formatting per current requirements. The original safety purpose — addressing cracking in propeller governor arms — remains unchanged."},"complexity_factors":["Single, specific mechanical component addressed (propeller governor arm)","Only 2 aircraft series affected with clearly defined serial number ranges","One primary action required (inspection per referenced service bulletin)","Single terminating action specified (fitment of specific part number)","Simple compliance timeline: initial 25 hours, then recurring 50 hours","No nested exceptions, conditional logic, or extensive cross-referencing","Background explanation is straightforward (cracking reported, failure = loss of control)","Amendment 1 only clarifies applicability and formatting — no substantive changes"],"plain_english_summary":"This Airworthiness Directive mandates inspection of the propeller governor arm on specified SIAI Marchetti S205/S208 aircraft and replacement with a stronger steel arm if cracking is found; installing the steel arm ends the inspection requirement. It affects owners/operators of the listed serial-numbered aeroplanes because governor-arm failure can cause loss of propeller control in flight. Amendment 1 only clarifies applicability and updates formatting; the safety requirement is unchanged."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement","history":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement/history","analysis":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement/important-cases","documents":"/api/acts/ad-sm-205-29-amdt-1-propeller-governor-arm-inspection-and-replacement/documents"}}