{"id":"F2006B09683","name":"AD/F27/115 Amdt 1 - Wing Structure - Skin Splice WS 7915","slug":"ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115829,"registerId":"commonwealth-F2006B09683-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/115 Amdt 1 - Wing Structure - Skin Splice WS 7915","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)  \nFokker F27 Series Aeroplanes\n\nAD/F27/115\n\nAmdt 1\n\n  \nWing Structure \\- Skin Splice WS 7915 12/88\n\nDM\n\nApplicability: All models S/Nos 10346 to 10692 excepting 10685 and 10688, also S/Nos 10105 to 10345 if fitted with outerwing S/No 246 or subsequent.\n\nRequirement: 1. Restrict Vb for:\n\n    MTOW 14969 kg (33000 lb) and greater to 165 knots IAS.\n\n    b. MTOW below 14969 kg (33000 lb), down to 13600 kg (30000 lb); Vb decreases linearly with aircraft MTOW from 165 knots IAS to 161 knots IAS.\n\n    2. Inspect the splice components at Wing Station 7915 in accordance with Fokker SB F27/57-63 Part 1.\n\n    3. Modify any unsatisfactory splice components in accordance with Fokker SB F27/57-63 Part 2.\n\nNote 1: Speed restrictions may be achieved by placing placards adjacent to ASI’s and including a Temporary Change into the Flight Manual.\n\nFlight Manual amendment is available from the appropriate regional office of the Authority.\n\nNote 2: RLD AD 88-55 issue 3 refers.\n\nCompliance: 1. Before further flight after 30 September 1988.\n\n    2. Before 01 March 1989.\n\n    3. Before 01 September 1989.\n\nBackground: The upper and lower wing skin panels at Wing Station 7915 may have been subject to incorrect heat treatment and consequently are below design strength. Amendment 1 increases the Applicability and specifies terminating action.","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":3,"scope_assessment":{"changed":true,"description":"This is Amendment 1 to the original AD/F27/115. The background explicitly states that this amendment 'increases the Applicability and specifies terminating action.' This means the scope expanded from the original directive to cover additional aircraft serial numbers, and it added the permanent repair (modification) as a terminating action to end the need for ongoing speed restrictions."},"complexity_factors":["Technical aviation terminology requiring specialised knowledge (e.g., 'Wing Station 7915', 'Vb', 'MTOW', 'IAS')","Applicability clause with multiple serial number ranges and exceptions (two excluded serial numbers plus conditional inclusion based on outer wing part numbers)","Mathematical linear interpolation formula for speed restrictions based on aircraft weight","Cross-references to external technical documents (Fokker Service Bulletin F27/57-63 Parts 1 and 2)","Three separate compliance deadlines with different dates","Reference to related foreign airworthiness directive (RLD AD 88-55 issue 3)"],"plain_english_summary":"This CASA Airworthiness Directive targets a manufacturing defect in the wing skin at WS7915 on certain Fokker F27s (serials ~10105–10692 with some exceptions). It imposes immediate reduced manoeuvring speed limits, requires inspections per Fokker Service Bulletin F27/57-63 and mandatory repairs where defects are found, with staged compliance deadlines. It aims to prevent wing structural failure and potential in-flight breakup."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 broadened the applicability to additional serial-number ranges and specifies terminating action for the defect; the Background states the amendment \"increases the Applicability and specifies terminating action.\""},"complexity_factors":["Applicability tied to specific serial-number ranges and conditional fitment, requiring operators to check fleet records (Applicability).","MTOW-dependent speed limit with a linear reduction between two weight breakpoints, requiring calculation and operational adjustments (Requirement 1b).","Mandated inspections and repairs refer to external manufacturer service bulletin divided into Part 1 (inspection) and Part 2 (modification), creating dependency on that SB's procedures and parts (Requirement 2–3).","Multiple, staged compliance deadlines spread over months increase administrative scheduling and downtime planning (Compliance).","Acceptable implementation methods include placards and Flight Manual amendment, imposing modest administrative and paperwork actions on operators (Note 1).","Reference to prior related directive (RLD AD 88-55 issue 3) and to terminating action raises traceability and record-keeping requirements (Note 2; Background)."],"plain_english_summary":"This airworthiness directive requires certain Fokker F27 aeroplanes (specified serial-number ranges) to reduce manoeuvre speed limits and to inspect and, if necessary, repair the wing skin splice at Wing Station 7915 because the skin panels may be below design strength. (Background.)\n\nOperators must implement speed limits by placards or a temporary Flight Manual change (Note 1; Requirement 1), carry out inspections per Fokker SB F27/57-63 Part 1 and perform required repairs per Part 2, by the staged compliance dates (Requirements 2–3; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915","history":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915/history","analysis":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915/analysis","conflicts":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915/conflicts","importantCases":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915/important-cases","documents":"/api/acts/ad-f27-115-amdt-1-wing-structure-skin-splice-ws-7915/documents"}}