{"id":"F2006B05759","name":"AD/PA-31/55 - Lower Inboard R.H. Wing Surface - Inspection","slug":"ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135617,"registerId":"commonwealth-F2006B05759-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/55 - Lower Inboard R.H. Wing Surface - Inspection","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-31 Series Aeroplanes\n\nAD/PA-31/55 Lower Inboard R.H. Wing Surface \\- Inspection 4/77\n\nApplicability: All models PA-31 and PA-31-325 with S/Nos. 31-7612064, to 31-7612110, 31- 7712001 to 31-7712012, 31-7712014, 31-7712015, 31-7712017, 31-7712018, 31-\n\n7712020, to 31-7712023, 31-7712025 to 31-7712027. All model PA-31- 350 with\n\nS/Nos. 31-7652104 to \\-7652120, \\-7652122, \\-7652124, \\-7652125, \\-7652127,\n\n\\-7652129, \\-7652130, \\-7652132 to 7652135, \\-7652137, \\-7652139, \\-7652141,\n\n\\-7652142, \\-7652145, \\-7652147, \\-7652148, \\-7652150, \\-7652151, \\-7652153,\n\n\\-7652154, \\-7652156, \\-7652157, \\-7652159, \\-7652162, to \\-7658777, \\-7752001,\n\n\\-7752002, \\-7752004 to \\-7752006, \\-7752008, \\-7752009, \\-7752011, \\-7752012,\n\n\\-7752015 \\-7752019, to \\-7752022, \\-7752027, \\-7752036, \\-7752038, \\-7752040,\n\n\\-7752042, \\-7752047 to \\-7752049.\n\nRequirement: 1. Inspect the RH wing lower surface from the front spar fuselage attachment diagonally aft to the wheel well area for indication of lower wing skin deformation and/or loose or missing rivets.\n\n2. For PA-31-350 “Navajo Chieftain” fabricate and install in full view of the pilot, a placard reading “MAXIMUM LANDING WEIGHT 6650 POUNDS” “(3016 KILOGRAMS)”.\n\nCompliance: 1. Initially before further flight and thereafter at intervals not exceeding 20 landings until modified in accordance with Piper SB No. 554.\n\n2. Before further flight, retain in position until modified.","sortOrder":0}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific structural defect in particular Piper aircraft. It has not expanded beyond its original purpose of ensuring airworthiness for these specific models."},"complexity_factors":["Single, specific mechanical issue (wing skin deformation)","Clear applicability section listing exact aircraft models and serial numbers","Two straightforward requirements: visual inspection and placard installation","Simple compliance timeline: 'before further flight' and 'every 20 landings'","No nested exceptions, conditional logic, or extensive cross-references to other legislation","Minimal defined terms (only standard aviation terminology like 'RH' for right-hand)"],"plain_english_summary":"This CASA Airworthiness Directive targets specific Piper PA‑31 series (including Navajo and Navajo Chieftain serials) and requires immediate and repeated inspections of the right lower wing skin and rivets, plus a cockpit placard limiting maximum landing weight to 6,650 lb for PA‑31‑350 Chieftain models. \n\nIt’s an interim safety measure addressing potential wing structural degradation until operators install the permanent Piper service bulletin repair."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as written, specifies affected models/serial numbers and the required inspections/placard; the text contains no language indicating an expansion or reduction of scope from an earlier instrument."},"complexity_factors":["Narrow, serial-numbered applicability increases administrative tracking for operators and regulators","Immediate compliance language ('before further flight') creates operational urgency and potential grounding until action is taken","Recurring inspection interval (every 20 landings) imposes ongoing maintenance scheduling and recordkeeping","Modification dependency on Piper Service Bulletin No. 554 requires access to and compliance with a manufacturer action","Placard fabrication and retention is a low-technical but mandatory retrofit with minimal technical complexity","Enforcement relies on operators maintaining proof of inspections, placard fitment, and eventual modification"],"plain_english_summary":"Requires owners/operators of specified Piper PA‑31 series aeroplanes to inspect the lower inboard right-hand wing surface for skin deformation and loose or missing rivets. For PA‑31‑350 “Navajo Chieftain” models it also requires fitting a pilot-visible placard limiting maximum landing weight to 6,650 lb (3,016 kg). Inspections must be done before further flight and then every 20 landings until the aircraft is modified per Piper Service Bulletin No. 554; the placard must be fitted and retained until that modification."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection","history":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection/history","analysis":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection/analysis","conflicts":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection/important-cases","documents":"/api/acts/ad-pa-31-55-lower-inboard-r-h-wing-surface-inspection/documents"}}