{"id":"F2009L02320","name":"AD/MU-2/72 - Electrical Wiring","slug":"ad-mu-2-72-electrical-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":162221,"registerId":"commonwealth-F2009L02320-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Mitsubishi MU-2 Series Aeroplanes","sectionType":"division","heading":"Mitsubishi MU-2 Series Aeroplanes","content":"### Mitsubishi MU-2 Series Aeroplanes\n\n| AD/MU-2/72 | Electrical Wiring | 7/2009 |\n| ---------- | ----------------- | ------ |\n\n```html\n

Applicability:

MU-2B model aeroplanes as follows:

Aeroplane Model

MU-2B-10, -15, -20 and -25
MU-2B-30
MU-2B-36

Serial Number

005 through 238
502 through 547
501

Requirement:

Unless already accomplished, inspect and, if necessary, correct any incorrect wiring of the engine fire detection circuit and the DC power emergency relay circuit in accordance with Mitsubishi Heavy Industries MU-2 Service Bulletin 187A dated
9 June 1981 or later Revision approved by the Japan Civil Aviation Bureau (JCAB).

Note: JCAB AD TCD-2048-81 refers.

Compliance:

Within 30 days after the effective date of this Directive.

This Airworthiness Directive becomes effective on 2 July 2009.

Background:

A review of Australian ADs has revealed that two JCAB ADs were never issued as Australian ADs because at the time of issue Australian registered MU-2B aircraft were not affected. Since then, additional MU-2B aeroplanes have been registered in Australia and some are in the affected serial number range. For this reason CASA is obliged to issue this AD to ensure that any incorrect electrical wiring is rectified.

\n```\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n18 May 2009","sortOrder":0},{"sectionNumber":"AD/MU-2/72","sectionType":"part","heading":"AD/MU-2/72","content":"## AD/MU-2/72","sortOrder":1},{"sectionNumber":"Electrical Wiring","sectionType":"part","heading":"Electrical Wiring","content":"## Electrical Wiring","sortOrder":2},{"sectionNumber":"7/2009","sectionType":"part","heading":"7/2009","content":"## 7/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Yes. The Directive extends Australian AD coverage to MU‑2B aeroplanes in serial ranges that were previously governed only by JCAB ADs but were not issued as Australian ADs because no affected Australian aircraft existed then. CASA states additional MU‑2B aircraft have since been registered in Australia, so this AD brings those aircraft within the Australian regulatory scope to require inspection and correction of specified wiring (Background; Applicability; Requirement)."},"complexity_factors":["Technical nature of work: requires inspection and corrective wiring work on safety‑critical circuits (engine fire‑detection and DC power emergency‑relay) (Requirement).","Prescriptive standard: compliance must follow Mitsubishi Heavy Industries Service Bulletin 187A (9 June 1981) or a later revision approved by the Japan Civil Aviation Bureau (JCAB) (Requirement).","Regulatory dependency: later revisions are only acceptable if JCAB‑approved, introducing cross‑jurisdictional approval reliance (Requirement).","Time pressure: mandatory compliance within 30 days of the Directive's effective date (Compliance).","Applicability limits: only specific MU‑2B models and narrow serial‑number ranges are affected, requiring accurate aircraft identity checks (Applicability).","Enforcement and administrative burden: CASA issues and enforces the AD; operators must arrange certified maintenance and document compliance (Background; Compliance).","Legacy omission: the AD corrects a prior gap where two JCAB ADs were not previously issued in Australia because no affected aircraft were then registered, so record‑checking and historical tracing may be needed (Background)."],"plain_english_summary":"Requires inspection and, if necessary, correction of incorrect wiring of the engine fire‑detection circuit and the DC power emergency‑relay circuit on specified Mitsubishi MU‑2B aeroplanes, carried out in accordance with Mitsubishi Heavy Industries Service Bulletin 187A (9 June 1981) or a later JCAB‑approved revision. Affects Australian‑registered MU‑2B aeroplanes in the listed serial‑number ranges; compliance is required within 30 days of the Directive taking effect (2 July 2009). CASA says it issues the Directive because earlier JCAB ADs were not adopted in Australia and additional affected aircraft have since been registered."},"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":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring defect in specific aircraft models. The background explains this is a catch-up directive to cover aircraft now registered in Australia that weren't previously affected, but this doesn't represent scope creep; it's the intended purpose of the instrument."},"complexity_factors":["Single, specific technical requirement referencing an external standard (Mitsubishi Service Bulletin 187A)","Limited applicability — only 3 specific model variants with defined serial number ranges","No defined terms section or interpretation provisions","Simple compliance deadline (30 days from effective date)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward background explanation without legal jargon"],"plain_english_summary":"This AD requires owners/operators of specified Mitsubishi MU-2B aircraft (certain MU-2B-10/15/20/25 serials 005–238; MU-2B-30 serials 502–547; MU-2B-36 serial 501) to inspect and correct wiring in the engine fire detection and DC emergency relay circuits per Mitsubishi Service Bulletin 187A, within 30 days. It addresses a safety gap—faulty wiring could prevent fire warnings or backup power—after affected aircraft were later imported into Australia."}},"importantCases":[],"_links":{"self":"/api/acts/ad-mu-2-72-electrical-wiring","history":"/api/acts/ad-mu-2-72-electrical-wiring/history","analysis":"/api/acts/ad-mu-2-72-electrical-wiring/analysis","conflicts":"/api/acts/ad-mu-2-72-electrical-wiring/conflicts","importantCases":"/api/acts/ad-mu-2-72-electrical-wiring/important-cases","documents":"/api/acts/ad-mu-2-72-electrical-wiring/documents"}}