{"id":"F2006B02149","name":"AD/AC/88 Amdt 1 - Flap System","slug":"ad-ac-88-amdt-1-flap-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41379,"registerId":"commonwealth-F2006B02149-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/88 Amdt 1 - Flap System","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)  \nTwin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\nAD/AC/88\n\nAmdt 1\n\n  \nFlap System 8/98\n\nApplicability: Models 500, 500A, 500B, 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680FL, 680FL(P), 680FP, 680T, 680V, 680W, 681, 685, 690, 690A, 690B,\n\n690C, 690D, 695, 695A, 695B, and 720 aircraft.\n\nRequirement: Perform the following in accordance with the Accomplishment Instructions section of Twin Commander Aircraft Corporation Mandatory Service Bulletin (SB) 226 or SB 226 Revision 1:\n\n    Inspect all flap system cable grooves for the correct width;\n\n    b. Inspect all flap system pulleys for rubbing on the support brackets;\n\n    c. Inspect all flap pulley cable assemblies for frayed wires; and,\n\n    d. Mark pulleys that have been inspected and have the correct groove radius, with two parallel lines specified in the service bulletin.\n\nIf any of the above discrepancies are found, rework or replace the affected part in accordance with SB 226 or SB 226 Revision 1.\n\nNote 1: SB 226 Revision 1 makes reference to a gauge that is available from the manufacturer for use in accomplishing the inspection.\n\nNote 2: FAA AD 98-07-17 Amdt 39-10437 refers.\n\nCompliance: Unless already accomplished, within 300 hours’ time in service after 16 July 1998.\n\nThis amendment becomes effective on 16 July 1998.\n\nBackground: The FAA received reports of cable fatigue, particularly the master pulley cable, on several of the affected aircraft. The actions specified by this Directive are intended to prevent flap system failure, which could result in loss of control of the aircraft.\n\nAmendment 1 is issued in response to a new FAA AD which resulted from several reports of worn or frayed flap system cables attributed to flap pulley grooves that are too narrow.\n\nThe original issue of this airworthiness directive became effective on 26 May 1994.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 refines and expands inspection requirements compared with the original AD: it adds specific checks for groove width, pulley rubbing and frayed wires, requires marking pulleys that meet the gauge, and references SB 226 Revision 1 and a manufacturer gauge. The amendment responds to new FAA reports and replaces or supplements the original 1994 directive’s measures."},"complexity_factors":["Technical inspection requirements (groove width, pulley rubbing, frayed wires) demand specialist maintenance skills and tools (SB 226 Accomplishment Instructions).","Cross-reference to manufacturer documents: compliance tied to SB 226 or SB 226 Revision 1 (operator must obtain and follow the service bulletin).","Use of a manufacturer-supplied gauge (Note 1) creates dependency on manufacturer availability and a specific measurement standard.","Wide applicability listing many aircraft models increases compliance population and record‑keeping burden (Applicability section).","Operational decision point: if discrepancies are found, parts must be reworked or replaced per SB 226, requiring parts, labour and possibly aircraft downtime.","Compliance timeframe (within 300 hours’ time in service after 16 July 1998) imposes a calculable scheduling constraint on operators.","Regulatory cross-reference to FAA AD 98-07-17 and prior AD history adds tracing and verification tasks for maintainers and regulators.","Safety-critical outcome (risk of loss of control) raises enforcement and reporting likelihood, increasing administrative oversight."],"plain_english_summary":"This directive requires operators of listed Twin Commander aeroplane models to inspect flap cable grooves, pulleys and cable assemblies per the manufacturer’s service bulletin (SB 226 or Rev 1), mark pulleys that meet the groove-radius gauge, and rework or replace defective parts within 300 flight hours of 16 July 1998. It applies to aircraft owners/operators and maintenance organisations, who bear inspection and repair costs and must follow the manufacturer’s procedures and use the referenced gauge. The stated purpose is to prevent flap-system failure after reports of cable wear."},"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 amendment maintains the original scope (flap system safety for Twin Commander aircraft). It does not expand to new aircraft types or systems; it simply tightens inspection requirements for the same problem based on new incident reports."},"complexity_factors":["Single, clearly defined applicability section listing 27 specific aircraft models","Four discrete, numbered inspection requirements with no nested conditions","Simple binary compliance trigger: 'if discrepancies found, then rework/replace'","Single compliance deadline with one exception clause ('unless already accomplished')","No defined terms section, no cross-references to other legislation beyond a single FAA reference note","Straightforward amendment structure: original 1994 directive plus one update based on new safety data"],"plain_english_summary":"This safety order requires owners/operators of specified Twin Commander (500–720 series) aeroplanes to inspect flap-system cables and pulleys for wear and improper pulley grooves, and to repair or replace defective parts. \n\nIt’s an amended, stricter follow-up to a 1994 order after reports of cable fatigue and fraying that could lead to flap failure and loss of control. Compliance is required within 300 flight hours after 16 July 1998."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-88-amdt-1-flap-system","history":"/api/acts/ad-ac-88-amdt-1-flap-system/history","analysis":"/api/acts/ad-ac-88-amdt-1-flap-system/analysis","conflicts":"/api/acts/ad-ac-88-amdt-1-flap-system/conflicts","importantCases":"/api/acts/ad-ac-88-amdt-1-flap-system/important-cases","documents":"/api/acts/ad-ac-88-amdt-1-flap-system/documents"}}