{"id":"F2006B10924","name":"AD/JETSTREAM/54 Amdt 2 - Ignition - Auto-Relight Magnetic Latching Relays","slug":"ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56467,"registerId":"commonwealth-F2006B10924-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/54 Amdt 2 - Ignition - Auto-Relight Magnetic Latching 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/54\n\nAmdt 2\n\n  \n\nIgnition - Auto-Relight Magnetic Latching Relays\n\n  \n5/93\n\nApplicability: Series 3100 and 3200 aircraft with constructors numbers in the range 693 to 870 inclusive, which incorporate an engine automatic ignition system in accordance with British Aerospace customer requirement kit JK 2496 or modification JM 7537.\n\nRequirement: Action in accordance with Jetstream Aircraft Limited Service Bulletin 74-JM 7693A Revision 3 dated 28 January 1993.\n\nNote: This Service bulletin has been classified as Mandatory by the CAA(UK).\n\nCompliance: The compliance date of the original issue of this Directive was 28 February 1993.\n\nAction required by this amendment is to be completed prior to 30 June 1993.\n\nBackground: Operators have reported cases of the auto-ignition facility being disabled when changing from ground power to internal power during ground start procedures. Corrective action is provided by this Directive, which mandates introduction of magnetically latching relays, together with wiring changes, to replace the existing electrically latching relays.\n\nThis amendment is issued to reflect a change in the requirement document which introduces wiring revisions to suit aircraft with any water methanol or water methanol/power augmentation system installed. Aircraft fitted with any water methanol or water methanol/power augmentation system, that have complied with previous issues of this Directive, will require rework.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment extends the original directive by adding wiring revisions to cover aircraft fitted with any water‑methanol or water‑methanol/power-augmentation systems and requires rework of aircraft that had complied with earlier issues; therefore the affected population and required actions broaden compared with the original issue."},"complexity_factors":["Technical specificity: requires particular relay type (magnetically-latching) and wiring changes, necessitating skilled maintenance.","Narrow applicability: applies only to Jetstream 3100/3200 with constructor numbers 693–870 and specific prior modifications (JK 2496 or JM 7537).","Interaction with auxiliary systems: introduces additional wiring revisions for aircraft fitted with water‑methanol or water‑methanol/power-augmentation systems.","Retroactive rework: aircraft that complied with earlier issues may need further modification, creating tracking and scheduling complexity.","Mandatory incorporation of a manufacturer Service Bulletin as the action standard.","Fixed compliance deadline requiring operational planning and possible aircraft downtime."],"plain_english_summary":"This directive requires certain British Aerospace Jetstream 3100/3200 aeroplanes (constructor numbers 693–870) fitted with the specified automatic ignition modification to have their electrically-latching ignition relays replaced by magnetically-latching relays and associated wiring changes, per Jetstream Service Bulletin 74-JM 7693A Rev 3. It addresses reports that auto-ignition can be disabled when switching from ground power to internal power during ground starts. Aircraft operators must arrange and pay for the mandated work by 30 June 1993; previously-compliant aircraft with water-methanol systems will require additional rework."},"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":false,"description":"This amendment remains tightly focused on its original purpose: fixing the auto-ignition relay problem in specific Jetstream aircraft. The amendment slightly expands the technical scope to accommodate water methanol systems, but this is a refinement of the same safety fix rather than mission creep. The core purpose (preventing auto-ignition failure during power transitions) remains unchanged."},"complexity_factors":["Single discrete applicability criteria (specific constructor number range and specific modification kits)","One primary technical requirement referencing an external service bulletin","Simple conditional logic for the amendment (water methanol system presence triggers rework requirement)","No defined terms section or interpretation provisions","Single compliance deadline with clear date","Limited cross-referencing (only to Civil Aviation Regulations 1998 Part 39 and the specific service bulletin)"],"plain_english_summary":"This mandatory safety directive affects British Aerospace Jetstream 3100/3200 aircraft (S/N 693–870) with automatic engine ignition. The automatic ignition can drop out when switching from ground to aircraft power, risking loss of auto‑relight during engine failure.\n\nOperators must follow Service Bulletin 74‑JM 7693A Rev 3 to replace electrically latching relays with magnetically latching ones and update wiring; aircraft with water‑methanol injection already modified must be reworked. Compliance by 30 June 1993."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays","history":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays/history","analysis":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays/analysis","conflicts":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays/conflicts","importantCases":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays/important-cases","documents":"/api/acts/ad-jetstream-54-amdt-2-ignition-auto-relight-magnetic-latching-relays/documents"}}