{"id":"F2006B02934","name":"AD/B737/30 Amdt 2 - Engine Throttle Cable","slug":"ad-b737-30-amdt-2-engine-throttle-cable","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42276,"registerId":"commonwealth-F2006B02934-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/30 Amdt 2 - Engine Throttle Cable","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)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/30\n\nAmdt 2\n\n  \nEngine Throttle Cable 1/92\n\nApplicability: Model 737-300, \\-400 and \\-500 series, listed in Boeing SB 737-76-1023.\n\nRequirement: Action in accordance with the technical requirement of FAA AD 91-21-13 Amdt 39- 8060.\n\nNote: Boeing SB 737-76-1023 refers.\n\nCompliance: As specified in the requirement document with a revised effective date of 12 January 1992 for Australian registered aircraft.\n\nBackground: Interference between the number two engine throttle cable and the adjacent right wing front spar bracket near station 124, has resulted in one throttle cable failure and a significant number of worn or frayed cables. This AD introduced an increased frequency inspection period until planned modification action by the manufacturer was available.\n\nAmendment 1 was raised to include the 400 series aeroplane which was the subject of a new country of origin AD.\n\nAmendment 2 to this Directive requires terminating action in lieu of repetitive inspections of the cable. The manufacturer has developed a modification which will eliminate the cable’s accelerated wear condition, and a condition referred to as “engine throttle cable ratcheting” which exists on each engine. The effective date required by the FAA is extended by approximately one month.","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":"The original directive (Amendment 0) introduced temporary repetitive inspections as an interim safety measure until a permanent fix was developed. Amendment 1 expanded applicability to include the -400 series. This Amendment 2 fundamentally shifts the scope from ongoing monitoring (inspections) to a definitive engineering solution (modification), effectively concluding the safety issue rather than managing it indefinitely. The scope has evolved from 'detect and monitor' to 'permanently resolve'."},"complexity_factors":["Short, single-purpose document (approximately 200 words)","Only 1 defined term implicitly referenced (the Boeing Service Bulletin)","Single cross-reference to FAA AD 91-21-13 for technical requirements","Simple amendment structure tracking evolution from inspections to modification","No nested conditional logic or exceptions — straightforward applicability and compliance requirements","Technical aviation terminology present but explained in context (e.g., 'station 124', 'terminating action')"],"plain_english_summary":"This CASA Airworthiness Directive requires Australian operators of certain Boeing 737-300/400/500 aircraft to install a manufacturer-designed modification that permanently stops throttle cable wear and engine throttle-cable ratcheting, replacing earlier repeated inspections. It follows the FAA action and affects owners/operators and maintenance organisations; it matters because degraded or failed throttle cables can cause loss of engine power control. Compliance mirrors the FAA AD with a slightly later Australian deadline."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The original directive increased inspection frequency pending a manufacturer fix (Background). Amendment 2 replaces repetitive inspections with a mandatory terminating modification developed by Boeing to eliminate accelerated cable wear and 'ratcheting' (Amendment 2). The amendment also follows inclusion of the -400 series in a prior amendment (Amendment 1) and adjusts the effective date for Australian operators (Compliance)."},"complexity_factors":["Cross-reference to FAA AD 91-21-13 as the required technical standard (Requirement).","Dependence on Boeing Service Bulletin 737-76-1023 for affected serials and procedures (Applicability; Note).","Change in mandated remedy from repeated inspections to a terminating modification (Amendment 2).","Multiple aircraft variants covered (737-300, -400, -500) and an earlier amendment adding the -400 series (Applicability; Amendment 1).","Compliance timing and a revised effective date that operators must track (Compliance).","Safety-critical maintenance work affecting flight‑control/throttle systems — needs qualified maintenance facilities and parts.","Regulatory enforcement by CASA using a foreign AD’s technical content, creating coordination and verification obligations for operators (Requirement; Compliance)."],"plain_english_summary":"This airworthiness directive requires operators of Boeing 737‑300, ‑400 and ‑500 aeroplanes listed in Boeing SB 737‑76‑1023 to follow the FAA AD 91‑21‑13 technical action: inspections were increased and, by Amendment 2, a manufacturer modification is now required to stop accelerated throttle‑cable wear and a condition called “engine throttle cable ratcheting.” Operators must pay for and schedule the work; CASA enforces compliance and set a revised effective date of 12 January 1992."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable","history":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable/history","analysis":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable/analysis","conflicts":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable/conflicts","importantCases":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable/important-cases","documents":"/api/acts/ad-b737-30-amdt-2-engine-throttle-cable/documents"}}