{"id":"F2006B10852","name":"AD/INST/48 - Honeywell Inertial Reference Unit","slug":"ad-inst-48-honeywell-inertial-reference-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56347,"registerId":"commonwealth-F2006B10852-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.002.png)![](image.001.png)AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)For 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 CAR 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\nInstruments and Automatic Pilots","sortOrder":0},{"sectionNumber":"AD/INST/48 Honeywell Inertial Reference ","sectionType":"part","heading":"AD/INST/48 Honeywell Inertial Reference Unit 9/2002","content":"# AD/INST/48 Honeywell Inertial Reference Unit 9/2002\n\nApplicability: Honeywell inertial reference units (IRU) with part number (P/N) HG1075AB05, any serial number (last four digits) 0644 through 0723 (excluding 0652 and 0659), that incorporates Modification 3 but not Modification 7; or\n\nHoneywell IRU P/N HG1075GB05, with either serial number (last four digits) 0652 or 0659, that incorporates Modification 2 but not Modification 6.\n\nNote 1: These IRUs are primarily on early manufactured Dassault Falcon Jets, but could be incorporated on other aircraft through either an STC or CAR (1988) 35 modification\n\nRequirement: 1. Inspect any affected IRU for proper function in accordance with the instructions in Honeywell Alert Service Bulletin (ASB) HG1075AB-34-A0013, dated 21 May 2001; or Honeywell ASB HG1075GB-34-A0005, dated 21 May 2001, as applicable.\n\n    2. If, during the Requirement 1 inspection, the IRU does not function properly, remove the IRU from the aeroplane and return it to Honeywell for incorporation of Modification 6 or 7, as applicable.\n    3. If, during the Requirement 1 inspection, the IRU functions properly, remove the IRU from the aeroplane and return it to Honeywell for incorporation of Modification 6 or 7, as applicable.\n    4. IRUs identified in the applicability statement may not be installed in any aeroplane unless the IRU has been modified at Honeywell, Inc. and updated to one of the following:\n\nIRU P/N HG1075AB05 IRU, to Mod 7, or IRU P/N HG1075GB05 IRU, to Mod 6.\n\nNote 2: FAA AD 2002-13-07 Amdt 39-12795 refers.\n\nCompliance: For Requirement 1 \\- Within the ne xt 50 hours time in service (TIS) after the effective date of this Directive.\n\nFor Requirement 2 \\- Prior to further flight after the Requirement 1 inspection.","sortOrder":1}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains a focused scope confined to the specified Honeywell IRU part/serial combinations and mandates inspection and manufacturer retrofit plus an installation ban until modified. There is no indication in the text that the applicability or fundamental scope was broadened or narrowed from the stated measure."},"complexity_factors":["Narrow, technical applicability: specific P/Ns and last-four-digit serial ranges with two serial-number exceptions (creates need for precise parts tracking).","Different modification pathways by part number (HG1075AB05 → Mod 7; HG1075GB05 → Mod 6) requiring correct identification of unit history.","Mandatory inspection within a short compliance window (50 hours TIS) imposes scheduling pressure on operators and maintenance providers.","Requirement to remove and return units to Honeywell for modification (creates logistics, downtime and cost for owners/operators).","Absolute installation prohibition unless unit has been modified at Honeywell (affects spares policy and aircraft dispatchability).","Dependence on external service documents (Honeywell ASBs) and cross-reference to an FAA AD (operator must consult multiple documents for procedures and records).","Potential interaction with STCs or prior CAR(1988) 35 modifications where these IRUs may be installed on non-listed aircraft (adds complexity to fleet-wide compliance checks)."],"plain_english_summary":"This Airworthiness Directive requires operators of particular Honeywell inertial reference units (specified part and serial ranges) to inspect the units within 50 hours TIS and to have any affected unit returned to Honeywell for a mandatory modification (Mod 6 or Mod 7). The directive also bans installation of those IRUs unless they have been modified. It mainly affects aircraft—primarily early Dassault Falcon jets or any aircraft fitted via STC—that use the listed IRUs and addresses an identified unsafe condition by mandating a manufacturer retrofit."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific unsafe condition in specific avionics units. The scope remains tightly focused on the identified safety defect without expansion into broader operational or maintenance requirements."},"complexity_factors":["Highly specific applicability criteria requiring cross-referencing of part numbers, serial number ranges, and modification status","Nested conditional logic: different service bulletins apply depending on which part number is involved","Counter-intuitive requirement structure: Requirements 2 and 3 are identical (remove regardless of inspection outcome), which creates confusion","Multiple cross-references to external documents (Honeywell ASBs, FAA AD 2002-13-07) that aren't reproduced in the text","Technical aviation terminology (TIS, STC, Modification, IRU) assumes specialized knowledge"],"plain_english_summary":"Australia’s aviation regulator (CASA) has issued a safety order for specific Honeywell Inertial Reference Units (early-model IRUs with certain serials). Operators must inspect affected units within 50 flight hours, then remove and return them to Honeywell for a mandatory upgrade; after the compliance date those units can’t be reinstalled unless upgraded. The order targets mainly early Dassault Falcon operators because the fault could give incorrect attitude/position data and risk loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit","history":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit/history","analysis":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit/analysis","conflicts":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit/conflicts","importantCases":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit/important-cases","documents":"/api/acts/ad-inst-48-honeywell-inertial-reference-unit/documents"}}