{"id":"F2006B02399","name":"AD/AMD 50/32 - GPIRS Hybrid Data","slug":"ad-amd-50-32-gpirs-hybrid-data","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41642,"registerId":"commonwealth-F2006B02399-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nAMD Falcon 50 and 900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/AMD 50/32 GPIRS Hybrid Data 1/2004 DM","sectionType":"part","heading":"AD/AMD 50/32 GPIRS Hybrid Data 1/2004 DM","content":"# AD/AMD 50/32 GPIRS Hybrid Data 1/2004 DM\n\nApplicability: Falcon 900EX aeroplanes fitted with Global Positioning/Inertial Reference System (GPIRS) part number (P/N) HG2001-GC03 or P/N HG2001-GD03, except aeroplanes with Dassault Aviation Service Bulletin (SB) F900EX-181 incorporated or modification M3386 embodied.\n\nMystère-Falcon 900 aeroplanes fitted with GPIRS P/N HG 2001-GC03 or P/N HG2001- GD03, except aeroplanes with Dassault Aviation SB F900-318 incorporated or modification M3386 embodied.\n\nMystère-Falcon 50 aeroplanes fitted with GPIRS P/N HG2001-GC02 or P/N HG2001-GC03 or P/N HG2001-GD03, except aeroplanes with Dassault Aviation SB F50-416 incorporated or modification M2873 embodied.\n\nRequirement: 1. Remove the Aircraft Flight Manual (AFM) temporary changes (TC) mandated by AD/AMD 50/27 and insert new TCs as follows:\n\n| Aeroplane Model | Remove | Insert |\n| --------------- | ------ | ------ |\n| F900            | TC 12  | TC 15  |\n| F900EX          | TC 53  | TC 57  |\n| F50             | TC 58  | TC 61  |\n\n    2. If the option of deactivating the GPS system by pulling and securing the circuit breakers have been implemented, incorporate Dassault Aviation SB F900EX- 190, F900-324 or F50-424, as applicable.\n\nNote 1: The incorporation of SB F900EX-190, F900-324 or F50-424, as applicable includes the cancellation of TC 15, TC 57 and TC 61, as applicable.\n\n    3. De-hybridise the GPIRS in accordance with Dassault Aviation SB F900EX-181 or F900-318, as applicable.\n\nNote 2: DGAC AD 2003-409(B) refers.\n\nCompliance: For Requirement 1 and 2 \\- Before further flight after the effective date of this Directive.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard airworthiness directive addressing a specific unsafe condition in specific aircraft. The scope remains tightly focused on the GPIRS hybrid data issue in Dassault Falcon aircraft. No evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Multiple aircraft models with slightly different applicability rules (F900EX vs F900 vs F50)","Multiple part numbers to check (HG2001-GC02, GC03, GD03) with different applicability per model","Exception clauses referencing specific Service Bulletins and modification numbers (M3386, M2873)","Cross-references to previous AD (AD/AMD 50/27) and foreign aviation authority directive (DGAC AD 2003-409(B))","Conditional logic in Requirement 2 ('If the option of deactivating...')","Technical aviation terminology requiring domain knowledge (GPIRS, de-hybridise, AFM temporary changes)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Dassault Falcon 50/900/900EX jets fitted with Honeywell GPIRS (HG2001‑GC02/GC03/GD03) to update flight manuals and replace temporary GPS-disabling measures. It addresses incorrect \"hybrid\" GPS/inertial position data by mandating a permanent remedy — converting affected GPIRS to pure inertial per Dassault service instructions.\n\nThe immediate manual and temporary-fix changes must be done before the aircraft next flies; the AD prevents navigation errors that could cause loss of control or collisions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This AD/AMD updates and expands the earlier temporary procedural mitigation into mandatory technical corrective actions. The Directive replaces previously required AFM temporary changes (from AD/AMD 50/27) with new TCs but also requires or offers embodiment of specific Dassault SBs and explicit de‑hybridisation of the GPIRS. Concretely, the instrument shifts the remedy set from purely operational/temporary AFM procedures toward mandatory hardware/software modification options (Service Bulletin embodiment and de‑hybridisation). It therefore broadens the scope of required corrective action from short‑term procedural controls to longer‑term maintenance modifications, while retaining the AFM changes as an immediate measure until the technical work is completed (see Requirement 1–3, Note 1, Compliance)."},"complexity_factors":["Applicability differentiates multiple aircraft models and several specific GPIRS part numbers with explicit exceptions for aircraft already modified or with certain SBs embodied","Cross‑references to multiple Dassault Service Bulletins (F900EX‑181, F900‑318, F900EX‑190, F900‑324, F50‑424, and others) that prescribe the technical work","Conditional compliance paths: operators can comply by AFM changes alone, by incorporating SBs (which cancels AFM TCs), or by de‑hybridising the GPIRS per SBs","Interplay of AFM temporary change identifiers (remove TC X, insert TC Y) requires careful administrative tracking per model","Short, immediate compliance timing (\"before further flight\") increases operational impact and urgency","Notes reference a foreign DGAC AD, adding an external cross‑reference to the regulatory context"],"plain_english_summary":"**What this Directive does (mechanically)**\n\n- Applies to certain Dassault Falcon 900EX, Mystère‑Falcon 900 and Falcon 50 aeroplanes that have specific GPIRS (GPS/Inertial) units fitted (listed by part number). It excludes aeroplanes that already have particular Dassault service bulletins (SBs) or modifications embodied (Applicability).  \n\n- Requires operators to remove previously-mandated Aircraft Flight Manual (AFM) temporary changes (TCs) imposed by an earlier AD and to insert new AFM temporary changes instead (Requirement 1). The exact TC numbers to remove and insert differ by aeroplane model (table in Requirement 1).  \n\n- Offers an alternative path: if the aircraft has implemented the option of deactivating the GPS system by pulling and securing circuit breakers, the operator must incorporate the relevant Dassault service bulletin (SB) for that model (Requirement 2). Incorporating those SBs cancels the new TCs (Note 1).  \n\n- Requires that the GPIRS be \"de‑hybridised\" (i.e. modified so it no longer operates in the hybrid configuration implicated here) in accordance with the stated Dassault SBs for the model (Requirement 3).  \n\n- Sets the compliance timing for the AFM TC changes and the SB incorporation: both actions must be done before further flight after the effective date of the Directive (Compliance).\n\n**Who this affects**\n\n- Aircraft owners and operators of the specified Falcon 50/900 series aeroplanes with the listed GPIRS part numbers.  \n- Maintenance organisations and licensed engineers who must perform AFM updates and embody the Dassault service bulletins.  \n- Flight crew, because AFM temporary changes alter operating limitations or procedures until the hardware/software fix or SB is embodied.\n\n**Why it matters (authority’s claim and operational effect)**\n\n- The issuing authority states the AD is necessary to correct an unsafe condition related to the GPIRS hybrid data. That is the stated purpose (see Requirement and Background references).  \n\n- Mechanically, the Directive moves from temporary procedural fixes (AFM temporary changes) to required technical fixes: either embodiment of specific SBs that allow GPS deactivation or an explicit de‑hybridisation of the GPIRS. AFM changes can be cancelled once the SB is embodied (Note 1), so the AD forces a permanent technical resolution unless the operator keeps the restrictive procedural mitigations in place.\n\n**Costs, incentives and trade‑offs (practical consequences)**\n\n- Who pays: owners/operators pay for the work (labour), any parts, and aircraft downtime caused by grounding until the work is done (Compliance: before further flight).  \n\n- Incentives: operators can choose between (a) immediately following new AFM procedures (short‑term, minimal technical work) or (b) embodying the SBs/de‑hybridisation (upfront maintenance cost and downtime but cancels AFM restrictions). The AD therefore creates a trade‑off between short‑term operational continuity and longer‑term removal of AFM limitations.  \n\n- Compliance burden: involves administrative work (remove/insert AFM pages), technical maintenance tasks (embody multiple possible SBs, de‑hybridise GPIRS) and coordination with maintenance providers. Some aircraft are excluded from the AD if they already have the listed SBs or earlier modifications, which reduces duplicated work for those aircraft.  \n\n- Implementation risk: availability of parts, qualified maintenance slots and proper embodiment of SB instructions will affect how quickly operators can return to normal operations. Poorly performed SB work risks incomplete mitigation of the unsafe condition.  \n\n- Effects on private choice and operations: AFM temporary changes may restrict certain operations until a technical fix is embodied; operators that elect the SB route restore normal AFM status but incur maintenance costs and downtime.  \n\n**Other mechanics and cross‑references**\n\n- The Directive cross‑references multiple Dassault service bulletins by model (e.g. F900EX‑181, F900‑318, F900EX‑190, F900‑324, F50‑424) and refers to a foreign airworthiness directive (DGAC AD 2003‑409(B)) (Notes and Requirements).  \n\n- The AD’s mandatory deadline for the AFM TC changes and the optional SB incorporation is \"before further flight after the effective date,\" making the timing immediate in operational terms (Compliance)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-32-gpirs-hybrid-data","history":"/api/acts/ad-amd-50-32-gpirs-hybrid-data/history","analysis":"/api/acts/ad-amd-50-32-gpirs-hybrid-data/analysis","conflicts":"/api/acts/ad-amd-50-32-gpirs-hybrid-data/conflicts","importantCases":"/api/acts/ad-amd-50-32-gpirs-hybrid-data/important-cases","documents":"/api/acts/ad-amd-50-32-gpirs-hybrid-data/documents"}}