{"id":"F2006L03552","name":"AD/A330/66 - Inertial Reference System","slug":"ad-a330-66-inertial-reference-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":61094,"registerId":"commonwealth-F2006L03552-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A330 Series Aeroplanes","sectionType":"division","heading":"Airbus Industrie A330 Series Aeroplanes","content":"### Airbus Industrie A330 Series Aeroplanes\n\n| AD/A330/66 | Inertial Reference System | 13/2006 TX |\n| ---------- | ------------------------- | ---------- |\n\n| Applicability: | A330-200 andA330-300 series aeroplanes, all certified models, all serial numbers equipped with either:                                                                                                                                                                                          |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|                | - Honeywell Air Data Inertial Reference Unit (ADIRU) Part Number (P/N) HG2030AC0X (with X in between 0 and 9 inclusive) or HG2030ADYY (with YY in between 00 and 10 inclusive), or                                                                                                              |\n|                | - Northrop Grumman (formerly Litton) ADIRU P/N 465020-030303ZZ (with ZZ in between 00 and 12 inclusive).                                                                                                                                                                                        |\n| Requirement:   | If not previously accomplished, insert Temporary Revision (TR) 2.05.00/67 (applying to Honeywell ADIRU standards) or TR 2.05.00/68 (applying to Northrop Grumman ADIRU standards), as applicable, in the Aircraft Flight Manual (AFM).                                                          |\n|                | The operational limitations introduced by this Directive are cancelled and the TRs may be removed from the AFM if either of the following has been accomplished:                                                                                                                                |\n|                | - at least one of these Airbus Modifications was embodied during production 47552, 47589, 50784, 51096, 51144, 51828, 52797, 54678 or any later approved standards, provided that the ADIRU has not been returned to the standards identified in the Applicability Statement of this Directive. |\n|                | - at least one of the following Airbus Service Bulletins (SB) or any later approved standards, provided that the ADIRU has not been returned to the standards identified in the Applicability Statement of this Directive:                                                                      |\n|                | • SB A330-34-3132, which installs Northrop Grumman ADIRU P/N 465020-03030314,                                                                                                                                                                                                                   |\n|                | • SB A330-34-3159, which installs Northrop Grumman ADIRU P/N 465020-03030315,                                                                                                                                                                                                                   |\n|                | • SB A330-34-3165, which installs Honeywell ADIRU P/N HG2030AE22,                                                                                                                                                                                                                               |\n|                | • SB A330-34-3104, which installs Honeywell ADIRU P/N HG2030AC11.                                                                                                                                                                                                                               |\n\n|             | Note: EASA AD 2006-0232 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | Within three days after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|             | This Airworthiness Directive becomes effective on 30 October 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background: | The European Aviation Safety Agency (EASA) has advised that the magnetic variation table which are implemented in the above Honeywell and Northrop Grumman ADIRUs are obsolete in certain countries.Studies have shown that, for a given airport, a difference greater than 3° between the magnetic heading and the runway heading (QFU) could lead to an unsafe situation during the phases of Cat 2 or Cat 3 automatic landing and roll out.This Directive mandates the operational restriction introduced by the AFM TR 2.05.00/67 and AFM TR 2.05.00/68. The A330 AFM TRs provide the list of affected airport and the date from which the «AUTOLAND» and «ROLL-OUT» are prohibited. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 October 2006","sortOrder":0},{"sectionNumber":"AD/A330/66","sectionType":"part","heading":"AD/A330/66","content":"## AD/A330/66","sortOrder":1},{"sectionNumber":"Inertial Reference System","sectionType":"part","heading":"Inertial Reference System","content":"## Inertial Reference System","sortOrder":2},{"sectionNumber":"13/2006 TX","sectionType":"part","heading":"13/2006 TX","content":"## 13/2006 TX","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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive imposes a temporary operational limitation on aircraft with the listed ADIRU part numbers until hardware/software changes are embodied; it does not expand applicability beyond those ADIRU standards. Removal conditions and the list of acceptable modifications/service bulletins are specified in the Requirement, so the Directive's scope remains tied to the originally identified ADIRU configurations and corrective actions."},"complexity_factors":["Narrow equipment-based applicability: specific ADIRU Part Numbers and numeric ranges for Honeywell and Northrop Grumman (Applicability section).","Operational requirement: mandatory AFM Temporary Revision insertion within a short deadline (three days after effective date) (Compliance).","Conditional removal: TRs may be removed only if one of several listed Airbus production modifications or specific Service Bulletins is embodied, and provided ADIRU has not been reverted to affected standards (Requirement).","Technical safety rationale tied to magnetic variation table obsolescence and a quantified threshold (>3° difference) affecting Cat II/III autoland and rollout (Background).","Cross-reference to external regulator instrument (EASA AD 2006-0232) increases regulatory linkage and potential interpretation dependencies (Note).","Operational impact concentrated on flight crews/operators (behaviour change: avoid AUTOLAND/ROLL-OUT at listed airports) with modest paperwork burden but possible operational rerouting or manual landing costs (Requirement/Background)."],"plain_english_summary":"This Directive requires operators of A330-200/300 aeroplanes fitted with specified Honeywell or Northrop Grumman ADIRUs to insert a Temporary Revision (TR) into the Aircraft Flight Manual within three days, which prohibits AUTOLAND and ROLL-OUT at listed airports. The measure responds to obsolete magnetic variation tables in those ADIRUs that can create >3° heading errors during Cat II/III automatic landings. The TRs may be removed once specified production modifications or service-bulletin ADIRU upgrades are embodied."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, single-purpose scope: addressing a specific hardware/software incompatibility in navigation systems. It has not expanded beyond its original safety intent."},"complexity_factors":["Multiple nested conditions for compliance (temporary fix vs permanent fix)","Specific part number ranges with wildcard placeholders (X, YY, ZZ)","Cross-references to external documents (EASA AD 2006-0232, Airbus Service Bulletins, Temporary Revisions)","Dual-track compliance paths depending on manufacturer (Honeywell vs Northrop Grumman)","Technical aviation terminology requiring domain knowledge (ADIRU, QFU, Cat 2/3, AFM TR)","Exception clauses for when modifications have 'not been returned' to non-compliant standards"],"plain_english_summary":"This emergency CASA Airworthiness Directive orders operators of Airbus A330-200/300s with certain Honeywell or Northrop Grumman ADIRUs to immediately insert a temporary flight‑manual revision banning AUTOLAND and automatic rollout at airports where the ADIRUs’ magnetic variation data is outdated. If magnetic error exceeds 3°, automatic landings in low‑visibility could produce off‑centre/unsafe touchdowns. Operators must insert the revision within 3 days; the restriction is lifted only after installing the upgraded ADIRUs via Airbus service actions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a330-66-inertial-reference-system","history":"/api/acts/ad-a330-66-inertial-reference-system/history","analysis":"/api/acts/ad-a330-66-inertial-reference-system/analysis","conflicts":"/api/acts/ad-a330-66-inertial-reference-system/conflicts","importantCases":"/api/acts/ad-a330-66-inertial-reference-system/important-cases","documents":"/api/acts/ad-a330-66-inertial-reference-system/documents"}}