{"id":"F2005L01736","name":"AD/A320/167 Amdt 1 - Airborne Ground Check Module","slug":"ad-a320-167-amdt-1-airborne-ground-check-module","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35808,"registerId":"commonwealth-F2005L01736-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A319, A320 and A321 Ser","sectionType":"division","heading":"Airbus Industrie A319, A320 and A321 Series Aeroplanes","content":"### Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n| AD/A320/167 Amdt 1 | Airborne Ground Check Module | 8/2005 |\n| ------------------ | ---------------------------- | ------ |\n\n| Applicability: | AIRBUS A320 aeroplanes equipped with Hamilton Sundstrand Airborne Ground Check Module (AGCM) Part Number (P/N) 769104, 769105 or 769106, except those aeroplanes which have incorporated AIRBUS modification 27189 during production without AIRBUS modification 28413.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Action in accordance with paragraph 4.1 and 4.2 of AIRBUS AOT 29A1112 Rev 1 or later DGAC approved revisions.2. Modify the AGCM in accordance with AIRBUS Service Bulletin A320-29-1111 or later DGAC approved revisions.Incorporation of the modification detailed in Requirement 2 of this Directive provides terminating action for this Directive.Note: DGAC AD F-2004-150(b) EASA approval No 2004-9025 dated August 24 2004 refers.                                                                                                                                                                                                                                                                                                                                                                                  |\n| Compliance:    | For Requirement 1:(a) For aeroplanes having completed a maintenance action carried out on the blue hydraulic system since the application of the CMR “one star” maintenance task “Operational check of RAT manual deployment and functional check of RAT using ground test unit followed by check of filter indicator” (MRB Report task 291000-7), and not having carried out the actions defined in paragraphs 4.1 and 4.1 of AIRBUS AOT A320-29A1112 Revision 1 or later DGAC approved revisions:Remains unchanged as: Within 3 days or 20 flight hours after 14 April 2005 (the effective date of the original issue of this Directive.)(b) For aeroplanes that have any maintenance on the blue hydraulic system after the effective date of this Directive:Before further flight.For Requirement 2: Before 31 July 2007. |\n\n|             | This Amendment becomes effective on 4 August 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Background: | Several operators have reported unsuccessful in-flight RAT tests during which a deployed RAT did not pressurise the blue hydraulic system. Investigations showed that air trapped in the RAT can lead to RAT pump cavitations. Modification of the RAT prevents the trapping of air. This Directive mandates certain actions following any maintenance action on the blue hydraulic system until such time as the AGCM is modified.This amendment is issued to correct a typographical error in the background statement with no change to the requirements or compliance periods.The original issue of this Directive became effective 14 April 2005. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n24 June 2005","sortOrder":0},{"sectionNumber":"AD/A320/167 Amdt 1","sectionType":"part","heading":"AD/A320/167 Amdt 1","content":"## AD/A320/167 Amdt 1","sortOrder":1},{"sectionNumber":"Airborne Ground Check Module","sectionType":"part","heading":"Airborne Ground Check Module","content":"## Airborne Ground Check Module","sortOrder":2},{"sectionNumber":"8/2005","sectionType":"part","heading":"8/2005","content":"## 8/2005","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":4,"scope_assessment":{"changed":false,"description":"This is a minor amendment correcting only a typographical error in the background statement. The substantive safety requirements, applicability, and compliance periods remain unchanged from the original April 2005 directive."},"complexity_factors":["Multiple nested applicability conditions (specific part numbers AND production modification exceptions)","Two-tier compliance structure with different deadlines based on maintenance history timing","Cross-references to external technical documents (Airbus AOT 29A1112, Service Bulletin A320-29-1111, DGAC AD F-2004-150)","Technical aviation terminology requiring domain knowledge (RAT, cavitation, blue hydraulic system, AGCM)","Conditional logic for Requirement 1 compliance (distinguishing between maintenance performed before vs after the directive's effective date)","Reference to French aviation authority (DGAC) approvals, adding international regulatory layering"],"plain_english_summary":"This CASA Airworthiness Directive mandates checks and a hardware modification for Airbus A320s fitted with Hamilton Sundstrand AGCM part numbers 769104/769105/769106 to prevent air-induced cavitation of the Ram Air Turbine emergency pump. Operators must perform Airbus AOT 29A1112 checks after blue hydraulic maintenance and complete the AGCM modification per SB A320-29-1111 by 31 July 2007. Amendment 1 only corrects a background typo; requirements and deadlines are unchanged."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment only corrects a typographical error in the Background and expressly states there is no change to the Directive's requirements or compliance periods. The substantive applicability, required actions and deadlines remain as in the original Directive (Background)."},"complexity_factors":["Applicability carve-out for aircraft with AIRBUS modification 27189 produced with modification 28413 (Applicability).","Two-step compliance: immediate checks after blue hydraulic maintenance plus a later mandatory modification (Requirement; Compliance).","Multiple compliance timeframes tied to maintenance timing and an absolute deadline (Compliance).","Termination of recurring checks only upon incorporation of the Service Bulletin modification (Requirement 2: terminating action).","Reliance on external technical documents and approvals (AIRBUS AOT A320-29A1112 Rev 1, Service Bulletin A320-29-1111; DGAC/EASA references noted in Requirement).","Technical subject-matter (RAT, blue hydraulic system, cavitation) requiring qualified maintenance resources (Background).","This Amendment corrects a typographical error in the background with no change to requirements or compliance periods (Background)."],"plain_english_summary":"Requires Airbus A319/A320/A321 aeroplanes fitted with Hamilton Sundstrand AGCM P/N 769104, 769105 or 769106 (except aircraft produced with mod 27189 and 28413) to perform specified ground checks after any blue-hydraulic maintenance and to modify the AGCM per an Airbus Service Bulletin (terminating action) by 31 July 2007. CASA enforces compliance.\n\nThe measure responds to trapped air in the RAT that can cause pump cavitation. Operators pay for inspections, modification costs and associated downtime; modification removes the recurring inspection obligation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module","history":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module/history","analysis":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module/analysis","conflicts":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module/conflicts","importantCases":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module/important-cases","documents":"/api/acts/ad-a320-167-amdt-1-airborne-ground-check-module/documents"}}