{"id":"F2007L01596","name":"AD/F2000/26 - Engine Fire Detection Units","slug":"ad-f2000-26-engine-fire-detection-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66162,"registerId":"commonwealth-F2007L01596-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dassault Aviation Falcon 2000 Series Aer","sectionType":"division","heading":"Dassault Aviation Falcon 2000 Series Aeroplanes","content":"### Dassault Aviation Falcon 2000 Series Aeroplanes\n\n| AD/F2000/26 | Engine Fire Detection Units | 7/2007 |\n| ----------- | --------------------------- | ------ |\n\n| Applicability: | Falcon 2000EX aeroplanes, serial number 06 and 28 to 107 inclusive, without modification M2958.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Remove the two fire monitoring units part number (P/N) 6342-01 and replace them with P/N 6342-02 units in accordance with Dassault Aviation Service Bulletin (SB) F2000EX-138 or later revision approved by the European Aviation Safety Agency (EASA).                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n|                | Note: EASA AD 2007-0119 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Compliance:    | Within the next 12 months after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 5 July 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | The EASA has advised that investigations after a CAS message \"ENG 1 FIRE DETECT FAIL\" that occurred on an in-service aircraft revealed that the detector threshold tolerances could not identify the failure of one single engine fire detector loop out of the two present on each engine. The fire detection system integrity was therefore not correctly monitored.AD/F2000/22 was initially issued, as an interim measure, to ensure fire detection system integrity by a one time inspection and will be cancelled.This Directive mandates installation of two new fire monitoring units of an improved design, each one of them is capable of monitoring the integrity of both detectors on the associated engine. |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n7 May 2007","sortOrder":0},{"sectionNumber":"AD/F2000/26","sectionType":"part","heading":"AD/F2000/26","content":"## AD/F2000/26","sortOrder":1},{"sectionNumber":"Engine Fire Detection Units","sectionType":"part","heading":"Engine Fire Detection Units","content":"## Engine Fire Detection Units","sortOrder":2},{"sectionNumber":"7/2007","sectionType":"part","heading":"7/2007","content":"## 7/2007","sortOrder":3}],"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":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific safety-critical defect in a particular aircraft model. The scope remains tightly focused on the engine fire detection system replacement as originally intended."},"complexity_factors":["Single, specific technical requirement with clear part numbers","Narrow applicability limited to specific serial number range and exclusion condition","Straightforward compliance deadline (12 months from effective date)","No nested exceptions or conditional logic beyond the serial number carve-out","Minimal cross-referencing (only to EASA AD and manufacturer service bulletin)","Short document with no interpretation section or defined terms"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Dassault Falcon 2000EX jets (specified serials, unless modified with kit M2958) to replace a faulty engine fire‑monitoring unit with an improved part. It fixes a design flaw where the old unit could fail to detect a lost fire sensor, risking undetected engine fires or missed system faults — restoring reliable fire warning protection. Completion was mandated within 12 months of 5 July 2007."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive formally expands the response from the earlier interim measure. AD/F2000/22 required a one‑time inspection to verify fire detection system integrity as a temporary measure. This Directive cancels that interim AD and requires a fleet‑wide hardware replacement (installing improved monitoring units) for the identified serial numbers unless mod M2958 is already fitted. That is a material change in required action (from inspection to mandatory component replacement), although it remains within the original safety objective of restoring reliable fire detection monitoring."},"complexity_factors":["Single clear mandated action: replace two specific P/N units with another P/N","Short applicability list: specific serial numbers (06 and 28–107) with a single exclusion (mod M2958)","Explicit cross-reference to one service bulletin (Dassault SB F2000EX-138) and allowance for later EASA‑approved revisions","Cross-reference to EASA AD 2007-0119 and cancellation of an earlier interim AD (AD/F2000/22)","Fixed compliance window (12 months) and an explicit effective date","Two part numbers involved (P/N 6342-01 and 6342-02) — low definitional load","Limited conditional logic (applicability depends on serial number and absence of a single mod)","Relies on external approval authority (EASA) for later SB revisions, adding some procedural dependency"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- **Requires** the removal of the two engine fire monitoring units with part number (P/N) 6342-01 and their replacement with P/N 6342-02 units.\n- The replacement must be performed in accordance with Dassault Aviation Service Bulletin F2000EX-138 (or a later revision that has been approved by the European Aviation Safety Agency, EASA).\n- **Which aeroplanes are affected:** Falcon 2000EX aeroplanes, serial number 06 and 28 to 107 inclusive, except those that already have modification M2958.\n- **When:** the work must be completed within 12 months of the directive’s effective date.\n- The directive cancels the earlier interim directive (AD/F2000/22) that required a one‑time inspection and replaces it with the mandatory unit replacement.\n\n**Why the change was ordered (source explanation)**\n\n- Investigations after an in-service cockpit alert (“ENG 1 FIRE DETECT FAIL”) showed that the detector threshold tolerances could allow one fire detector loop (each engine has two loops) to fail without that failure being detected by the monitoring system. In short, the system could fail to correctly detect loss of a detector loop.\n- The new P/N 6342-02 monitoring units are described as an improved design; each unit is capable of monitoring the integrity of both detectors on the associated engine.\n- The directive references EASA AD 2007-0119 as related material.\n\n**Who is affected and who pays**\n\n- Primary costs fall on the owners/operators of the affected Falcon 2000EX aircraft. They must procure the replacement units and pay for labour, downtime and any associated inspections.\n- The Civil Aviation Safety Authority (through its delegate) enforces compliance; Dassault’s service bulletin provides the technical method, and EASA approval is required for later revisions of that service bulletin.\n\n**Practical implementation and decision points**\n\n- Operators must check serial numbers and whether mod M2958 is fitted (those with M2958 are excluded).\n- Operators must obtain and follow SB F2000EX-138 or an EASA‑approved later revision; if a later revision is used it must have EASA approval.\n- Completion must occur within the 12-month window; failure to comply exposes the operator to regulatory enforcement action.\n\n**Costs, incentives, trade-offs and risks**\n\n- Direct costs: purchase of two replacement monitoring units per aircraft, installation labour, line downtime and any test/inspection work required by the SB.\n- Timing and supply risk: a 12‑month compliance window concentrates demand for P/N 6342-02 and for qualified maintenance slots; this can increase procurement lead times and immediate labour demand.\n- Operational incentive: operators have a regulatory incentive to complete the modification to avoid non‑compliance and potential operational restrictions. There is also an operational safety incentive (restoring monitoring integrity).\n- Regulatory and approval discretion: the directive requires use of the Dassault SB or a later revision only if that later revision has EASA approval. That creates dependence on EASA for acceptance of revised procedures.\n- Substitution effects: operators lacking immediate access to parts or approved revisions may defer flights or incur costs to source the approved units and competent maintenance support.\n\n**Implementation risk and compliance burden**\n\n- The directive is prescriptive about parts and the service bulletin, so compliance requires obtaining the specified parts and following the SB procedures; any deviation would need regulatory approval.\n- Aircraft already modified by M2958 are excluded, so operators need accurate records to determine applicability.\n- The requirement cancels an earlier interim inspection and replaces it with a hardware change, increasing the expected maintenance work compared with the one‑time inspection.\n\n**Source‑stated purpose vs practical effects**\n\n- The stated purpose is to ensure that each engine’s fire detection system integrity is correctly monitored by installing improved monitoring units (source: Background). Practically, this changes the operator burden from a one‑time inspection to a mandatory hardware replacement across the applicable fleet, with the attendant procurement, installation and downtime costs.\n\n(References in the source: Applicability; Requirement; Compliance; Background; note referencing EASA AD 2007-0119.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f2000-26-engine-fire-detection-units","history":"/api/acts/ad-f2000-26-engine-fire-detection-units/history","analysis":"/api/acts/ad-f2000-26-engine-fire-detection-units/analysis","conflicts":"/api/acts/ad-f2000-26-engine-fire-detection-units/conflicts","importantCases":"/api/acts/ad-f2000-26-engine-fire-detection-units/important-cases","documents":"/api/acts/ad-f2000-26-engine-fire-detection-units/documents"}}