{"id":"F2006B08632","name":"AD/CON/49 Amdt 1 - Rotary Fuel Pump P/N 643367A2","slug":"ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51626,"registerId":"commonwealth-F2006B08632-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CON/49 Amdt 1 - Rotary Fuel Pump P/N 643367A2","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nTeledyne Continental Motors Piston Engines\n\nAD/CON/49\n\nAmdt 1\n\n  \nRotary Fuel Pump P/N 643367A2 8/87 TX\n\nApplicability: GTSIO-520-N Series engines fitted with Lear Siegler rotary fuel pump P/N 643367A2.\n\nRequirement: Action in accordance with the technical requirement of FAA AD Priority Letter 87- 04-05 dated 12 February 1987 as follows:\n\nQuote;\n\n\"(a) Cut and remove the safety wire from the four attaching screws on the regulator valve cover of fuel pump P/N 643367A2.\n\n    (b) Loosen screws one full turn\n\n    (c) Tighten the four screws to 24-27 inch pounds\n\n    (d) Safety wire the four screws with .032 inch wire\" Unquote.\n\n(Lear Siegler INC SB No. 101SB015 dated 17 December 1986, and TCM SB No. M87-6 dated 6 February 1987 refer).\n\nCompliance: Within 10 operating hours after 27 February 1987.\n\nNote: Prior compliance with the referenced Service Bulletins does not constitute compliance with this Directive.\n\nBackground: This Directive is amended to correct the metrication error which was introduced into the 7 May published issue of this Directive. Reference to Nm has been deleted from this Amendment.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical amendment correcting a unit-of-measurement error in the original directive. The scope remains exactly as intended: mandatory safety action for a specific fuel pump model. The amendment does not expand coverage to new aircraft, add new requirements, or alter the fundamental purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly ('Applicability' describes affected equipment)","No cross-references to other legislation or regulations beyond citing FAA AD and service bulletins","Simple linear procedural instructions (4 sequential steps)","Single compliance deadline with no conditional exceptions","Clear, technical but straightforward language aimed at aircraft mechanics"],"plain_english_summary":"This CASA Airworthiness Directive mandates a corrective repair to Lear Siegler fuel pump P/N 643367A2 installed on certain Teledyne Continental GTSIO‑520‑N piston engines: loosen and re‑torque regulator‑cover screws to 24–27 inch‑pounds and install 0.032‑inch safety wire to secure them. Operators of affected aircraft must comply within 10 operating hours after 27 Feb 1987. The amendment corrects a prior metrication error (Newton‑meters vs inch‑pounds) that could have caused leaks, fire, or engine failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Amendment corrects a metrication/unit error by removing a reference to Newton‑metres. It does not change which engines are affected or the required maintenance actions (Background)."},"complexity_factors":["Narrow applicability: only GTSIO‑520‑N engines with pump P/N 643367A2 (Applicability)","Specific technical actions and tolerances: torque 24–27 inch‑pounds and .032 inch safety wire (Requirement)","Short compliance window: within 10 operating hours after 27 Feb 1987 (Compliance)","Dependence on external documents: refers to FAA AD Priority Letter and two Service Bulletins (Requirement)","Administrative correction only: amendment deletes an incorrect Nm reference (Background)"],"plain_english_summary":"This directive requires owners/operators of Teledyne Continental GTSIO‑520‑N engines fitted with Lear Siegler rotary fuel pump P/N 643367A2 to loosen, retorque, and safety‑wire the four regulator valve cover screws to specified values and wire size, following the FAA priority letter (Requirement). CASA issued the directive; the maintenance cost and labour fall to the aircraft owner/operator, and compliance is required within 10 operating hours after 27 February 1987 (Compliance). The amendment only corrects a prior metrication/unit error (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2","history":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2/history","analysis":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2/analysis","conflicts":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2/conflicts","importantCases":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2/important-cases","documents":"/api/acts/ad-con-49-amdt-1-rotary-fuel-pump-p-n-643367a2/documents"}}