{"id":"F2006B05407","name":"AD/PA-20/16 Amdt 1 - Fuselage Door Frame Tube Corrosion","slug":"ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46051,"registerId":"commonwealth-F2006B05407-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-20/16 Amdt 1 - Fuselage Door Frame Tube Corrosion","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)  \nPiper PA-20 (Pacer) Series Aeroplanes\n\nAD/PA-20/16\n\nAmdt 1\n\n  \nFuselage Door Frame Tube Corrosion 1/87\n\nApplicability: All model PA-20 with S/Nos 20-01 to 20-1121. Requirement: 1. Action in accordance with Piper SB No 819; or\n\n2. Carry out a radiographic inspection of the areas stipulated in Piper SB No 819 to a scheme approved by the Secretary.\n\nCompliance: 1. Unless previously accomplished, prior to 30 November 1986; or\n\n2. Unless previously accomplished, prior to 30 November 1986 and thereafter at intervals not exceeding 3 years.\n\nNote: Radiographic technique No ANTDS.86.4 by Gippsland Aeronautics is a scheme acceptable for compliance with this Directive.\n\nBackground: The manufacturer reports instances of excessive corrosion between steel tubing and preformed stell sections which form the structure of the door frames, windshield and baggage areas of the fuselage. Amendment 1 of this Directive gives the option of a repetitive radiographic inspection.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2714},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 modifies the original directive's scope by introducing an alternative compliance pathway. While the original likely mandated permanent modification per Piper SB 819, this amendment allows operators to satisfy the airworthiness requirement through repetitive radiographic inspections every three years instead of a one-time repair."},"complexity_factors":["Single-page directive with minimal text","Only one external reference to interpret (Piper Service Bulletin No. 819)","Simple binary compliance choice (repair vs. inspect)","Clear applicability limited to a defined serial number range","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This directive affects owners/operators of Piper PA‑20 Pacers (serials 20‑01 to 20‑1121). Corrosion has been found between steel tubes and pre‑formed sections in door frames, windshield and baggage areas, which can weaken the structure and endanger airworthiness.\n\nYou must either carry out the permanent repair specified in Piper Service Bulletin No. 819 or arrange Secretary‑approved radiographic inspections (Gippsland’s ANTDS.86.4 is acceptable). Actions were required by 30 Nov 1986; inspections recur no more than every three years."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion","history":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion/history","analysis":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion/analysis","conflicts":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion/conflicts","importantCases":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion/important-cases","documents":"/api/acts/ad-pa-20-16-amdt-1-fuselage-door-frame-tube-corrosion/documents"}}