{"id":"F2006B10906","name":"AD/JETSTREAM/38 Amdt 2 - Electrical Power Inverter Transfer Function","slug":"ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56444,"registerId":"commonwealth-F2006B10906-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/38 Amdt 2 - Electrical Power Inverter Transfer Function","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/38\n\nAmdt 2\n\n  \nElectrical Power Inverter Transfer Function 3/91\n\nApplicability: Jetstream 3100 and 3200 aircraft as detailed in the Requirement document. Requirement: 1. Action in accordance with BAe Alert SB 24-A-JA 900443 Revision 2.\n\nNote 1. CAA (UK) Mandatory AD 31-04-90 also refers.\n\nNote 2. Flight Manual amendment A/3100-3107/20 also refers.\n\n2. Action in accordance with BAe Alert SB 24-A-JM 7708 dated 2 March 1990\\. Compliance: Requirement 1: Prior to 16 May 1990.\n\nRequirement 2: Prior to 16 August 1990.\n\nBackground: British Aerospace has advised of recent unacceptable AC power fluctuations which cause nuisance warnings and malfunctioning of essential flight instruments. BAe SB 24-A-JM 7708 introduces a modification to ensure that the operational inverter is isolated from the faulty inverter, and that stable AC power is available.\n\nBAe ASB 24-A-900443 Revision 2 introduces a modification which ensures that the captain and co pilot’s essential flight instruments cannot be simultaneously connected to a faulty or unacceptable AC power source.\n\nAmendment 1 to this AD has been issued to:\n\n    Amend the effectivity;\n\n    2. To include advice that compliance with BAe SB 24-JM 7740 (refer AD/JETSTREAM/39) and BAe SB 24-JA900941 (optional) will reinstate the inverter transfer function and render compliance with SB 24-A-JA 900443 no longer necessary.\n\nAmendment 2 to this AD has been issued to advise of the promulgation of AD/JETSTREAM/39, which mandates compliance with BAe SB 24-JM 7740 requiring introduction of inverter Part No 1B350-1B1-3; and to clarify item 2 of Background paragraph 3 above.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This remains a targeted safety directive for a specific electrical system defect in Jetstream aircraft. The amendments have refined applicability and clarified relationships with other directives, but have not expanded beyond the original purpose of mandating inverter system modifications."},"complexity_factors":["Short, single-purpose document (2 requirements only)","Heavy reliance on external technical documents (BAe Service Bulletins) without reproducing their content","Multiple amendment notes creating layered history (original AD, Amendment 1, Amendment 2)","Cross-references to related directives (AD/JETSTREAM/39) and UK authority (CAA UK AD 31-04-90)","Technical aviation terminology (inverters, transfer functions, effectivity) assumes specialized knowledge","Compliance dates are historical (1990) making current applicability require careful checking"],"plain_english_summary":"This AD mandates mandatory modifications to British Aerospace Jetstream 3100/3200 aircraft to eliminate dangerous AC power fluctuations from inverters that caused false warnings and instrument failures. It affects owners/operators and maintenance personnel in Australia because non‑compliance is unlawful. Amendment 2 clarifies a required replacement inverter part under a later AD and refines earlier technical wording to ensure the fixes reliably prevent simultaneous loss or cross‑connection of essential flight instruments."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendments altered the AD’s effectivity and its interplay with other service bulletins. Amendment 1 adjusted effectivity and advised that compliance with BAe SB 24-JM 7740 (and optional SB 24-JA900941) would reinstate the inverter transfer function and could make compliance with SB 24-A-JA 900443 unnecessary. Amendment 2 promulgated AD/JETSTREAM/39, mandating SB 24-JM 7740 which requires inverter Part No 1B350-1B1-3, and clarified background text — collectively narrowing/redirecting which specific SB compliance is required."},"complexity_factors":["Limited applicability: only BAe Jetstream 3100 and 3200 series (clear scope reduces complexity).","Multiple referenced service documents: BAe Alert SB 24-A-JA 900443 Rev 2 and BAe Alert SB 24-A-JM 7708 (operators must follow specific SBs).","Two separate compliance deadlines (Requirement 1: prior to 16 May 1990; Requirement 2: prior to 16 August 1990) add scheduling complexity.","Interactions with other ADs/SBs: AD/JETSTREAM/39 and BAe SB 24-JM 7740 (mandating inverter Part No 1B350-1B1-3) can change which actions remain necessary.","Amendment history: Amendments change effectivity and clarify that compliance with other SBs may render some actions unnecessary, requiring cross-referencing.","Technical nature of remedy: hardware modification to inverter transfer function and instrument power distribution involves parts, installation and testing (operational and maintenance burden)."],"plain_english_summary":"This airworthiness directive requires operators of British Aerospace Jetstream 3100/3200 aeroplanes to install BAe service‑bulletin modifications that change the inverter transfer function so a faulty inverter is isolated and the captain’s and co‑pilot’s essential flight instruments cannot both be fed from a bad AC source. Operators must install the specified modifications and parts by the AD’s two compliance deadlines; operators pay for and arrange the work, and compliance restores stable AC power and instrument segregation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function","history":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function/history","analysis":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function/analysis","conflicts":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function/conflicts","importantCases":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function/important-cases","documents":"/api/acts/ad-jetstream-38-amdt-2-electrical-power-inverter-transfer-function/documents"}}