{"id":"F2006B10849","name":"AD/INST/45 - Honeywell Air Data Inertial Reference Units","slug":"ad-inst-45-honeywell-air-data-inertial-reference-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56341,"registerId":"commonwealth-F2006B10849-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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 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.","sortOrder":0},{"sectionNumber":"AD/INST/45 Honeywell Air Data Inertial R","sectionType":"part","heading":"AD/INST/45 Honeywell Air Data Inertial Reference Units 6/2000 DM","content":"# AD/INST/45 Honeywell Air Data Inertial Reference Units 6/2000 DM\n\nApplicability: Honeywell air data inertial reference units (ADIRU) having a serial number below 0841 and a part number (P/N) listed below:\n\n| Aeroplane Manufacturer | Model                                                                                                                                                                                                                                                                                  | ADIRU P/N  |\n| ---------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- |\n| Boeing                 | 757-300                                                                                                                                                                                                                                                                                | HG2050AC02 |\n|                        | 737-600                                                                                                                                                                                                                                                                                | HG2050AC03 |\n|                        | 737-700                                                                                                                                                                                                                                                                                | HG2050AC04 |\n|                        | 737-800                                                                                                                                                                                                                                                                                | HG2050AC05 |\n| Airbus                 | A319-111, A319-112, A319-113, A319-114, A319-131, A319-132, A320-111, A320-211, A320-212, A320-214, A320-231, A320-232, A320-233, A321-111, A321-112, A321-131, A330-202, A330-301, A330-223, A330-321, A330-322, A330-323, A340-211, A340-311, A340-212, A340-312, A340-213, A340-313 | HG2030AD09 |\n| Airbus                 | A330-202, A330-301, A330-223, A330-321, A330-322, A330-323, A340-211, A340-311, A340-212, A340-312, A340-213, A340-313                                                                                                                                                                 | HG2030AD10 |\n\nRequirement: 1. Inspect the identification plate of the ADIRU to determine its modification status, in accordance with Honeywell Alert Service Bulletin (ASB) HG2030AD-34- A0009 (for an ADIRU having P/N HG2030AD09 or HG2030AD10) or ASB HG2050AC-34-A0008 (for an ADIRU having P/N HG2050AC02, HG2050AC03,\n\nHG2050AC04, or HG2050AC05), both dated 9 March 2000; as applicable.\n\n    2. If any ADIRU having P/N HG2050AC02, HG2050AC03, HG2050AC04, or HG2050AC05 is not marked as modification 2 or 3 replace the ADIRU with an ADIRU specified in either Requirement 2.a. or 2.b. below, in accordance with Honeywell ASB HG2050AC-34-A0008, dated 9 March 2000.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD applies to the ADIRUs and aircraft listed and requires inspection and conditional replacement to correct an unsafe condition as stated in the directive (Applicability; Requirement 1–2). The excerpt shows no indication the scope was broadened or narrowed from that stated purpose."},"complexity_factors":["Technical specificity: requires following Honeywell Alert Service Bulletins for inspection instructions (Requirement 1).","Applicability by serial number and multiple part numbers increases operator screening effort (Applicability).","Conditional action: replacement mandated only if plate lacks modification 2 or 3, creating a pass/fail inspection step (Requirement 2).","Operational burden: physical inspection of identification plates across affected aircraft and potential sourcing/installation of replacement ADIRUs (Requirement 1–2).","Cross-reference dependence: the AD directs compliance in accordance with external Honeywell documents, creating reliance on manufacturer procedures (Requirement 1).","Enforcement and discretion: CASA delegate issues the AD and sets timing via the compliance section (preamble and compliance reference), but the excerpt omits explicit compliance time, creating potential scheduling uncertainty."],"plain_english_summary":"This Airworthiness Directive requires operators of certain Honeywell Air Data Inertial Reference Units (ADIRUs) with serial numbers below 0841 and specified part numbers to inspect the unit identification plate per Honeywell service bulletins and, for some part numbers, replace units not marked as modification 2 or 3. It affects aircraft listed by manufacturer and model that use these ADIRUs. Operators must follow the Honeywell ASBs and bear the inspection and replacement work; CASA enforces compliance to address an identified unsafe condition."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive focused on a specific safety defect in specific Honeywell equipment. It has not expanded beyond its original purpose of addressing unsafe ADIRU units in the identified aircraft fleet."},"complexity_factors":["Highly specific technical scope — applies only to specific Honeywell part numbers and serial number ranges","Multiple cross-references to external Honeywell Alert Service Bulletins (ASBs) dated 9 March 2000","Conditional logic: Requirement 2 only triggers if inspection reveals the unit lacks modification 2 or 3","Nested applicability: must match aircraft manufacturer, specific model variants, part number, AND serial number threshold","Technical aviation terminology throughout (ADIRU, P/N, ASB, modification status) requiring domain knowledge"],"plain_english_summary":"This AD orders inspection and, where necessary, replacement of certain Honeywell ADIRUs (serials <0841) installed on specified Boeing and Airbus types. It targets units lacking later modification markings that could harbor an unsafe failure mode.\n\nADIRUs supply critical airspeed, attitude and heading data; failures can give pilots incorrect flight information. The directive forces verification and retrofit/replacement to eliminate the known unsafe condition before continued operation."},"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-inst-45-honeywell-air-data-inertial-reference-units","history":"/api/acts/ad-inst-45-honeywell-air-data-inertial-reference-units/history","analysis":"/api/acts/ad-inst-45-honeywell-air-data-inertial-reference-units/analysis","conflicts":"/api/acts/ad-inst-45-honeywell-air-data-inertial-reference-units/conflicts","importantCases":"/api/acts/ad-inst-45-honeywell-air-data-inertial-reference-units/important-cases","documents":"/api/acts/ad-inst-45-honeywell-air-data-inertial-reference-units/documents"}}