{"id":"F2006B08438","name":"AD/CESSNA 560/1 - Engine Flow Divider Start Valve Diaphragm","slug":"ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115927,"registerId":"commonwealth-F2006B08438-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 560/1 - Engine Flow Divider Start Valve Diaphragm","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)  \nCessna 560 (Citation V) Series Aeroplanes\n\nAD/CESSNA 560/1 Engine Flow Divider Start Valve Diaphragm 13/92\n\nDM\n\nApplicability: Cessna 560 series aircraft fitted with PWC JT15D-5A engines not incorporating Pratt and Whitney Canada Service Bulletin No. 7372.\n\nRequirement: 1\\. Amend the Aircraft Flight Manual to reflect the requirements of Pratt and Whitney Canada Service Information Letter (SIL) No. 7060 Rev.1, Recommendation: Para. 1.\n\n2. Action in accordance with the requirements of Pratt and Whitney Canada Service Bulletin No. 7371.\n\nNote: Transport Canada Directive CF-92-19 refers.\n\nCompliance: Effective 21 October 1992:\n\n    Before further flight.\n\n    2. Within 50 hours time in service, or before 1 December 1992, whichever occurs first.\n\nBackground: This Directive has been issued to reflect advice of two uncommanded in-flight engine shut-down events. The events resulted from deterioration of the engine flow divider start valve diaphragm. The Directive requires an amendment to the Aircraft Flight Manual to address a possible in-flight start valve failure event, and a modification of the flow divider to reduce the start valve diaphragm temperature pending the release of a terminating action.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of addressing the flow divider diaphragm failure issue."},"complexity_factors":["Single, specific aircraft type and engine combination (Cessna 560 + JT15D-5A)","Only two compliance actions required, with clear deadlines","Minimal defined terms (only 'Applicability', 'Requirement', 'Compliance', 'Background')","No nested exceptions or conditional logic — applicability is a straightforward binary (has/doesn't have SB 7372)","Short document (under 200 words)","References external documents (Service Bulletin 7371, Service Information Letter 7060) but does not incorporate their text"],"plain_english_summary":"This AD mandates safety actions for Cessna 560 (Citation V) jets with Pratt & Whitney Canada JT15D-5A engines that haven’t been modified per SB 7372. Pilots must immediately add emergency engine-failure procedures to the Aircraft Flight Manual, and within 50 flight hours or by 1 Dec 1992 mechanics must modify the flow divider start valve per SB 7371. It responds to in‑flight shutdowns caused by heat‑degraded fuel-system diaphragms."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive confines action to specified Cessna 560 aircraft with JT15D‑5A engines and to two discrete measures: amend the Flight Manual and modify the flow divider per Pratt & Whitney instructions. The stated purpose is to address in‑flight shutdowns due to start‑valve diaphragm deterioration (Background); there is no indication in the text that the Directive expands beyond that technical, aircraft‑specific remediation."},"complexity_factors":["Narrow, specific applicability (Cessna 560 with JT15D‑5A engines not incorporating PWC SB No. 7372) — limits affected population but requires operator identification of fitted configuration (Applicability).","Requires both a Flight Manual amendment and a mechanical modification — mixes paperwork and technical maintenance tasks (Requirement: amend AFM per SIL No. 7060 Rev.1; modify per SB No. 7371).","Relies on external manufacturer documents (Pratt & Whitney SIL/SBs) for the technical steps and safe‑life judgement, creating dependency on obtaining and following those documents (Requirement).","Urgent compliance timeline (before further flight; or within 50 hours or by a calendar date) increases scheduling and operational disruption for operators (Compliance).","Cross‑reference to another regulator’s directive (Transport Canada CF‑92‑19) indicates coordination but also potential for differing guidance or interpretation across jurisdictions (Note/Background)."],"plain_english_summary":"This Airworthiness Directive (issued by the Civil Aviation Safety Authority) requires operators of Cessna 560 aircraft with Pratt & Whitney JT15D‑5A engines (unless modified per PWC SB 7372) to amend the Flight Manual and perform a flow‑divider modification per Pratt & Whitney service instructions to prevent uncommanded in‑flight engine shutdowns caused by start‑valve diaphragm deterioration. Operators bear the cost, must comply immediately (before further flight or within 50 hours, or by 1 Dec 1992), and update manuals and maintenance records to reflect the change."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm","history":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm/history","analysis":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm/analysis","conflicts":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm/conflicts","importantCases":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm/important-cases","documents":"/api/acts/ad-cessna-560-1-engine-flow-divider-start-valve-diaphragm/documents"}}