{"id":"F2005L03595","name":"AD/PA-28/97 - AN894-6-4 Bushing Screw Thread Expanders","slug":"ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39206,"registerId":"commonwealth-F2005L03595-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-28 Series Aeroplanes","sectionType":"division","heading":"Piper PA-28 Series Aeroplanes","content":"### Piper PA-28 Series Aeroplanes\n\n| AD/PA-28/97 | AN894-6-4 Bushing Screw Thread Expanders | 13/2005 |\n| ----------- | ---------------------------------------- | ------- |\n\n| Applicability: | The New Piper Aircraft Models PA-28-160, PA-28-161, PA-28-180, and PA-28-181 aeroplanes, serial numbers 28-671 through 28-5859, 28-7105001 through28-7505261, 28-7690001 through 28-8590001, and all serial numbers thereafter that Incorporate Peterson Aviation Inc. Supplemental Type Certificate (STC) SA2660CE installed between 20 April 1998 and 1 April 2005 and Incorporate Petersen Aviation Inc. Service Bulletin (SB) SB98-1. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Replace the two AN894-6-4 bushing screw thread expanders on the two AN826-6 tees (one on the gascolator and the other one attached to a bushing (AN912-2J) attached to the inlet on the top of the top fuel pump) with NAS1564-6-4J reducers and AN818-6 nuts in accordance with Petersen Aviation Inc. SB PA-28-160, -161, -180,-181 and No. SB 05-2 dated 12 April 2005.Note: FAA AD 2005-19-20 Amdt 39-14285 refers.                   |\n| Compliance:    | At the next 100-hour (+ 10 hours) or annual inspection that occurs following 30 days after effective date of this AD, whichever occurs first.                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 22 December 2005.                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | This AD is the result of reports of fuel leaks during the post STC installation tests. The actions specified in this AD are intended to prevent fuel fittings used in STC SA2660CE from leaking fuel in the engine compartment, which could result in an engine fire. This condition could lead to loss of control of the aeroplane.                                                                                                      |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n10 November 2005","sortOrder":0},{"sectionNumber":"AD/PA-28/97","sectionType":"part","heading":"AD/PA-28/97","content":"## AD/PA-28/97","sortOrder":1},{"sectionNumber":"AN894-6-4 Bushing Screw Thread Expanders","sectionType":"part","heading":"AN894-6-4 Bushing Screw Thread Expanders","content":"## AN894-6-4 Bushing Screw Thread Expanders","sortOrder":2},{"sectionNumber":"13/2005","sectionType":"part","heading":"13/2005","content":"## 13/2005","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is consistent with its stated purpose: it mandates a specific parts replacement on aircraft with the named STC/SB and serial numbers to stop fuel leaks. The directive does not expand or narrow applicability beyond correcting the reported post‑STC leaks."},"complexity_factors":["Narrow technical prescription: specifies exact parts to remove and fit (AN894-6-4 → NAS1564-6-4J + AN818-6).","Limited but detailed applicability: multiple serial-number ranges plus requirement that STC SA2660CE and SB SB98-1 be incorporated.","Timing constraint tied to inspection schedule: next 100‑hour (+10) or annual inspection after a 30‑day delay.","Verification burden: operators must determine whether the STC/SB were installed on each aircraft.","Supply and maintenance cost: procurement of specified parts and qualified maintenance labour required.","Safety-driven mandatory compliance reduces discretion for operators once applicability is established."],"plain_english_summary":"Requires replacing two AN894-6-4 bushing screw thread expanders on the fuel-system AN826-6 tees with NAS1564-6-4J reducers and AN818-6 nuts on specified Piper PA‑28‑160/161/180/181 aeroplanes that had Petersen STC SA2660CE installed between 20 April 1998 and 1 April 2005. The work must be carried out at the next 100‑hour (+10 hours) or annual inspection occurring at least 30 days after the AD’s effective date.\n\nThe action is intended to stop STC-related fuel leaks in the engine compartment that could lead to an engine fire. Operators pay parts and labour and must confirm STC/SB applicability before compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific safety defect in a specific modification kit on specific aircraft. It has not expanded beyond its original purpose of preventing fuel leaks from the AN894-6-4 bushing screw thread expanders."},"complexity_factors":["Single discrete technical requirement (replace two specific parts with two other specific parts)","Precise but narrow applicability criteria involving multiple serial number ranges and date ranges","References external technical documents (Petersen Aviation Service Bulletin SB 05-2) for implementation details","Cross-reference to US FAA directive (FAA AD 2005-19-20) for context","Standard aviation regulatory structure with defined compliance timeframe","No nested exceptions or conditional logic — straightforward replacement mandate"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of certain Piper PA‑28 (160/161/180/181) aeroplanes fitted with the Petersen Aviation fuel system STC (SA2660CE) between April 1998 and April 2005 to replace AN894‑6‑4 bushing screw thread expanders with NAS1564‑6‑4J reducers and AN818‑6 nuts. It responds to fuel leakage during testing that could lead to fire and loss of control. Compliance is required at the next 100‑hour or annual inspection after 22 December 2005 (30‑day grace period)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders","history":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders/history","analysis":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders/analysis","conflicts":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders/conflicts","importantCases":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders/important-cases","documents":"/api/acts/ad-pa-28-97-an894-6-4-bushing-screw-thread-expanders/documents"}}