{"id":"F2006B10944","name":"AD/JETSTREAM/74 Amdt 1 - Autopilot Trim Relays","slug":"ad-jetstream-74-amdt-1-autopilot-trim-relays","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56498,"registerId":"commonwealth-F2006B10944-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/74 Amdt 1 - Autopilot Trim Relays","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)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/74\n\nAmdt 1\n\n  \nAutopilot Trim Relays 8/97\n\nApplicability: All Jetstream Series 3100 aeroplanes equipped with an autopilot installed under Jetstream Aircraft Ltd Modifications JK3027, 3243, 3352 or 3483.\n\nRequirement: Modify the autopilot system, by the installation of two additional relays and associated wiring changes, in accordance with Jetstream Aircraft Ltd Mandatory Service Bulletin 22-JK 2628 Revision 2 dated 21 October 1996.\n\nNote: This Service Bulletin has been classified as Mandatory by the CAA(UK).\n\nCompliance: Prior to 31 October 1997, unless previously accomplished.\n\nThis airworthiness directive becomes effective on 17 July 1997.\n\nBackground: This amendment corrects a typographical error identifying the applicable modifications. The Prefix “JM” has been amended to read “JK’.\n\nBritish Aerospace, Civil Aircraft Division, Notice to Operators JS22/3 issued on\n\n13 February 1986 and Service Bulletin 22-JA 860214 dated 6 February 1987, together with a subsequent revision to the Maintenance Schedule, introduced an 800 hour life limit on the pitch up and pitch down relays in the autopilot system.\n\nFollowing compliance with this Directive, the 800 hour life limit will no longer apply. The original issue of this airworthiness directive became effective on\n\n30 January 1997.","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 minor amendment correcting a typographical error (JM to JK). The substantive scope remains unchanged from the original directive — it still applies to the same aircraft modifications and requires the same physical modification to the autopilot system."},"complexity_factors":["Single, specific technical requirement with clear reference to an external service bulletin","Limited applicability — only 4 specific modification types on one aircraft series","One compliance deadline with simple 'unless previously accomplished' exception","Background section provides helpful context but is not legally operative","No nested definitions, cross-references to other legislation, or conditional logic chains"],"plain_english_summary":"This safety order requires operators of British Aerospace Jetstream 3100 aircraft fitted with the specified autopilot modifications to update the autopilot by adding two relays and revising wiring per Jetstream Mandatory Service Bulletin 22-JK 2628 Rev 2. It’s a safety fix to eliminate an 800‑hour relay life restriction. Amendment 1 corrects a typo in the modification code (JM → JK). Work was required to be completed by 31 October 1997 unless already done."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment corrects a typographical error in the applicability clause by changing the prefix ‘JM’ to ‘JK’, clarifying which modification numbers are covered. The substantive requirement—to install two additional relays and wiring per the Mandatory Service Bulletin—remains unchanged, and compliance removes the prior 800‑hour life limit on pitch relays (Background; Applicability; Requirement)."},"complexity_factors":["Technical hardware work: installation of two relays and wiring changes requires maintenance facility hours and parts (Requirement).","Mandatory Service Bulletin compliance: work must follow Jetstream 22-JK 2628 Revision 2 (Requirement, Note).","Narrow and specific applicability: only Jetstream Series 3100 aircraft with autopilot mods JK3027, 3243, 3352 or 3483 are affected (Applicability).","Compliance scheduling: fixed compliance deadline (prior to 31 October 1997) and effective date (17 July 1997) constrain operator planning (Compliance, Effective date).","Maintenance regime change: after modification the previously imposed 800‑hour life limit on pitch relays is removed, affecting ongoing maintenance planning (Background).","Administrative correction: amendment corrects a typographical error in the listed modification prefixes (‘JM’ → ‘JK’), which affects legal clarity of applicability (Background)."],"plain_english_summary":"The directive requires owners/operators of British Aerospace Jetstream 3100 aeroplanes with autopilots installed under modifications JK3027, 3243, 3352 or 3483 to install two additional autopilot trim relays and associated wiring per Jetstream Mandatory Service Bulletin 22-JK 2628 Rev 2. The Civil Aviation Safety Authority mandates compliance by 31 October 1997. Operators bear the cost and downtime for the modification; once done the previous 800‑hour life limit on the pitch relays is removed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays","history":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays/history","analysis":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays/analysis","conflicts":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays/conflicts","importantCases":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays/important-cases","documents":"/api/acts/ad-jetstream-74-amdt-1-autopilot-trim-relays/documents"}}