{"id":"F2006L01021","name":"AD/FPE/17 - Meggitt Safety Systems Model 602 Smoke Detectors","slug":"ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58296,"registerId":"commonwealth-F2006L01021-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fire Protection Equipment","sectionType":"division","heading":"Fire Protection Equipment","content":"### Fire Protection Equipment\n\n| AD/FPE/17 | Meggitt Safety SystemsModel 602 Smoke Detectors | 5/2006 |\n| --------- | ----------------------------------------------- | ------ |\n\n```html\n

Applicability:

Meggitt Safety Systems Model 602 smoke detectors approved under United States Federal Aviation Administration (FAA) Technical Standard Order (TSO) TSO-C1c and having any part number (P/N) 8930-( ) identified as a \"Current Part Number\" in Meggitt Service Information Letter (SIL) 8930-26-01, Revision C, dated 25 May 2005, as installed on various transport category aeroplanes, including but not limited to, the aeroplane models listed below.

Manufacturer

Aerospatiale

Boeing


McDonnell Douglas

Aeroplane Model

ATR42-200, -300, -320 and -500
ATR72-101, -201, -102, -202, -211, -212 and -212A
727, 727C, 727-100, 727-100C, 727-200 and 727-200F series
737-100, -200, -200C, -300, -400, -500, -600, -700, -700C,
-800 and -900 series
DC-10-10 and DC-10-10F; DC-10-15; DC-10-30 and
DC-10-30F (KC-10A and KDC-10); together with DC-10-40 and DC-10-40F
MD-10-10F and MD-10-30F
MD-11 and MD-11F
717-200 series

Requirement:

1. If not previously accomplished, replace the affected smoke detector with a modified smoke detector, in accordance with Meggitt SIL 8930-26-01,
Revision C.

Replacement of a smoke detector before the effective date of this Directive is also acceptable if accomplished in accordance with either the original issue of Meggitt SIL 8930-26-01, dated 8 November 2004; Revision A, dated 8 November 2004 or Revision B, dated 19 January 2005.

2. Meggitt Model 602 smoke detector having any P/N 8930-( ) identified as a \"Current Part Number\" in Meggitt SIL 8930-26-01, Revision C, may not be installed on any aeroplane as either an initial installation or as a replacement spare.

\n```\n\n| | Later revisions of the above SIL, approved by the FAA as an Alternate Method of Compliance (AMOC) to FAA AD 2006-04-04, are considered acceptable for compliance with the equivalent Requirements of this Directive. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Note: FAA AD 2006-04-04 Amdt 39-14485 refers. |\n| Compliance: | For Requirement 1 - Within six months after the effective date of this Directive. |\n| | For Requirement 2 - As of the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 11 May 2006. |\n| Background: | The FAA has advised that certain Meggitt Model 602 smoke detectors can \"lock up\" during electrical power transfer from the auxiliary power unit to the engines. This Directive requires replacing the affected smoke detectors with modified smoke detectors and is issued to ensure that the flight crew is alerted in the event of a fire. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n29 March 2006","sortOrder":0},{"sectionNumber":"AD/FPE/17","sectionType":"part","heading":"AD/FPE/17","content":"## AD/FPE/17","sortOrder":1},{"sectionNumber":"Meggitt Safety SystemsModel 602 Smoke De","sectionType":"part","heading":"Meggitt Safety SystemsModel 602 Smoke Detectors","content":"## Meggitt Safety Systems \nModel 602 Smoke Detectors","sortOrder":2},{"sectionNumber":"5/2006","sectionType":"part","heading":"5/2006","content":"## 5/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original scope as a targeted safety intervention for a specific defective aircraft component. The scope remains precisely limited to Meggitt Model 602 smoke detectors with specific part numbers installed on enumerated transport category aircraft. There is no evidence of scope creep; the directive addresses exactly the safety risk identified in the background (detector lock-up during power transfer) without expanding to unrelated systems or aircraft types."},"complexity_factors":["Single, clearly defined applicability scope targeting specific part numbers and aircraft models","Two straightforward requirements with clear compliance deadlines","Cross-reference to US FAA Technical Standard Order (TSO-C1c) and FAA Airworthiness Directive (2006-04-04) for technical specifications","Reference to manufacturer Service Information Letter (SIL 8930-26-01) with multiple acceptable revisions for compliance","No nested exceptions or conditional logic — requirements apply uniformly to all affected aircraft","Limited defined terms (only standard aviation abbreviations like P/N, TSO, AMOC, FAA)","Short document length with tabular presentation of affected aircraft models"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires airlines and aircraft operators to fix a dangerous fault in specific smoke detectors used on certain passenger and cargo aeroplanes.\n\n**What the problem is:**\nThe Meggitt Safety Systems Model 602 smoke detectors (used to detect fires in aircraft) can \"lock up\" (freeze and stop working) when electrical power switches from the auxiliary power unit to the engines. If this happens during a fire, the flight crew might not get a warning.\n\n**Who must act:**\nOperators of specific transport category aeroplanes including:\n- **Aerospatiale** ATR42 and ATR72 series\n- **Boeing** 727 and 737 series\n- **McDonnell Douglas** DC-10, MD-10, MD-11, and 717 series\n\n**What must be done:**\n1. **Replace** the faulty smoke detectors with modified versions within 6 months of the directive taking effect (11 May 2006).\n2. **Stop installing** the unmodified detectors immediately — they cannot be used as new or spare parts from the effective date onwards.\n\n**Why it matters:**\nSmoke detectors are critical safety equipment. A detector that fails during power transfer could allow a fire to go undetected, putting passengers, crew, and aircraft at serious risk. This directive ensures the detectors work reliably when needed most."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope, as stated in the text, is to remove from service and prohibit reinstallation of specific Meggitt Model 602 smoke detectors (identified P/Ns in SIL 8930-26-01 Revision C) on the listed transport-category aeroplanes, to mitigate a reported \"lock up\" failure mode during APU-to-engine power transfer (Applicability; Requirement 1 and 2; Background). The text also expressly accepts prior replacements done under earlier SIL revisions and later SIL revisions approved by the FAA as AMOCs; those provisions refine acceptable compliance paths but do not expand or narrow the core technical scope of which parts and installations are targeted."},"complexity_factors":["Technical specificity of affected equipment: single model (Meggitt Model 602) tied to specific part numbers identified in a manufacturer SIL (Applicability).","Cross-references to external documents: compliance depends on following Meggitt SIL 8930-26-01 (Revision C) and accepts later FAA‑approved SIL revisions as AMOCs (Requirement 1; AMOC note).","Two distinct requirements with different timing and legal effect: mandatory replacement within six months (Requirement 1; Compliance) and an immediate ban on installing the listed P/Ns as spares (Requirement 2; Compliance).","List of affected aeroplane models across multiple manufacturers increases the operational footprint for compliance (Applicability).","Allowance for prior compliance under earlier SIL revisions creates conditional acceptability (Requirement 1).","Reference to FAA Airworthiness Directive and AMOC process introduces inter-agency approval steps and potential variability in accepted methods (AMOC note; Note: FAA AD 2006-04-04)."],"plain_english_summary":"This directive requires operators of aeroplanes fitted with Meggitt Model 602 smoke detectors (the part numbers listed in Meggitt SIL 8930‑26‑01 Rev C) to replace them with the modified detector within six months and forbids installing the listed current P/Ns as spares. It targets aircraft where these detectors are FAA‑TSO‑C1c approved.\n\nIt matters because certain Model 602 units can \"lock up\" during APU-to-engine power transfer, risking missed fire alerts; operators bear the replacement cost and may use FAA‑approved later SIL revisions as AMOCs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors","history":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors/history","analysis":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors/analysis","conflicts":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors/conflicts","importantCases":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors/important-cases","documents":"/api/acts/ad-fpe-17-meggitt-safety-systems-model-602-smoke-detectors/documents"}}