{"id":"F2012L00608","name":"AD/A320/140 Amdt 1 - Relay 11QG Relocation & Test","slug":"ad-a320-140-amdt-1-relay-11qg-relocation-test","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":88826,"registerId":"commonwealth-F2012L00608-current","compilationNumber":null,"startDate":"2026-04-02","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/A320/140Amdt 1 | Relay 11QG Relocation & Test | 6/2012 |\n| ----------------- | ---------------------------- | ------ |\n\n| Applicability: | A319, A320 and A321 aeroplanes, all models and serial numbers without Airbus Industrie modification 26065 incorporated during production or Airbus Industrie Service Bulletin (SB) A320-24-1092, Revision 4, dated 20 June 2002 embodied.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Unless already accomplished in accordance with AD/A320/102, relocate the relay 11QG from relay box 103VU to the shelf 95VU in accordance with the instructions given in SB A320-24-1092 Revision 4.2. Unless already accomplished in accordance with AD/A320/102, for aircraft on which SB A320-24-1092 original issue or Revision 1 or Revision 2 have been received, verify that:a. the 4 contacts installed in terminal block FIN209VT12 correspond to part number (P/N) NSA937910EA2000,b. if the P/N is different from NSA937910EA2000, install contacts P/N NSA937910EA2000 in accordance with the instructions given in SBA320-24-1092 Revision 3 or Revision 4.3. Unless already accomplished, perform the additional test required after the relocation of the relay 11QG, in accordance with SB A320-24-1092 Revision 4.Note: DGAC AD 2002-365(B) refers. |\n| Compliance:    | For Requirements 1 and 2 - before 15 May 2000, or within 500 hours time in service after 9 September 1999 or before further flight.For Requirement 3 - Within 600 flight hours from the original effective date of this AD (3 October 2002).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Amendment becomes effective on 20 March 2012.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | AD/A320/102 was based on DGAC AD 1999-263-134(B), mandating the embodiment of Service Bulletin (SB) A320-24-1092 Revision 3. The SB calls for the relocation of the engine/master 1 relay 11QG to avoid any risk of simultaneous cut-off of the fuel supply to both engines by the low pressure shut-off valves by water ingress in relay box 103VU. Revision 3 replaced Revisions 1 and 2 which contained erroneous instructions.                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n\n|     | On 20 July 2002, DGAC AD 1999-263-134(B) was cancelled and replaced with DGAC AC 2002-365(B) which mandates the adherence to SB A320-24-1092 Revision 4. It requires additional testing following the relay relocation.Amendment 1 is issued to reflect the cancellation of DGAC AD 1999-263-134(B) and release of DGAC AC 2002-365(B) which mandates SB A320-24-1092 Revision 4.This AD replaces AD/A320/102 which is cancelled. It incorporates the initial requirements of DGAC AD 1999-263-134(B). |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 March 2012","sortOrder":0},{"sectionNumber":"AD/A320/140Amdt 1","sectionType":"part","heading":"AD/A320/140Amdt 1","content":"## AD/A320/140Amdt 1","sortOrder":1},{"sectionNumber":"Relay 11QG Relocation & Test","sectionType":"part","heading":"Relay 11QG Relocation & Test","content":"## Relay 11QG Relocation & Test","sortOrder":2},{"sectionNumber":"6/2012","sectionType":"part","heading":"6/2012","content":"## 6/2012","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 amendment maintains the original safety purpose of preventing dual engine fuel shut-off due to water ingress. Amendment 1 simply updates the referenced documentation to reflect the cancellation of the original French DGAC directive and replacement with a new one, and incorporates additional testing requirements. The core scope — relocating relay 11QG — remains unchanged from the original intent."},"complexity_factors":["Multiple cross-references to other Airworthiness Directives (AD/A320/102) and French aviation authority directives (DGAC AD 1999-263-134(B), DGAC AD 2002-365(B))","Three distinct technical requirements with different compliance deadlines","Conditional applicability based on production modification status and prior service bulletin embodiment","Nested conditions in Requirement 2 (checking part numbers only if earlier revisions of service bulletin were applied)","Technical aviation terminology requiring specialised knowledge (relay boxes, FIN numbers, service bulletins, time in service)","Dual compliance timelines with alternative deadlines ('before 15 May 2000, or within 500 hours... or before further flight')"],"plain_english_summary":"This CASA Airworthiness Directive mandates relocating relay 11QG (which controls engine fuel shut‑off valves) on certain Airbus A319/A320/A321 aircraft to prevent water ingress in its original relay box that could cause simultaneous engine fuel loss. It applies to operators whose aircraft lack a prior factory modification or earlier service update and requires follow‑up electrical checks and tests to eliminate the single‑point failure risk."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment supersedes and cancels the earlier AD/A320/102 and updates the mandatory work to align with Airbus SB A320‑24‑1092 Revision 4. Compared with the original AD, it (a) shifts the mandatory reference to a later SB revision (Revision 4) which added an additional post‑relocation test, and (b) explicitly requires verification/replacement of terminal block contacts for aeroplanes that had only the original or early SB issues. In short, the Amendment preserves the original relocation requirement but expands the compliance detail (part‑number checks and a specified additional functional test) and clarifies that earlier, erroneous SB revisions must be superseded by the corrected instructions."},"complexity_factors":["Conditional applicability: excludes aeroplanes that already have modification 26065 or SB A320‑24‑1092 Revision 4 embodied (Applicability).","Multiple distinct actions: relocate relay; verify part numbers; replace contacts if wrong; perform additional test (three separate requirements).","Cross‑references to several Service Bulletin revisions (original, Revision 1, Revision 2, Revision 3, Revision 4) with different instructions tied to aircraft history.","Reference to and replacement of a prior AD (AD/A320/102) and foreign DGAC ADs, increasing the regulatory genealogy operators must trace (Background).","Different compliance windows and historical deadlines attached to different requirements (creates temporal complexity).","A technical parts check (specific P/N NSA937910EA2000) that may require parts procurement and inventory verification."],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Requires a physical maintenance change to specified Airbus A319/A320/A321 aeroplanes: move (relocate) the relay labelled 11QG from relay box 103VU to shelf 95VU, following the step‑by‑step instructions in Airbus Service Bulletin (SB) A320‑24‑1092 Revision 4. (Requirement 1)\n- For aeroplanes that received earlier issues of that SB (original issue, Revision 1 or Revision 2), it requires operators to check that four contacts in terminal block FIN209VT12 are the correct part number (P/N NSA937910EA2000). If they are not, those contacts must be replaced with the correct P/N following SB Revision 3 or Revision 4. (Requirement 2)\n- After the relay is relocated, it mandates an additional functional test prescribed in SB A320‑24‑1092 Revision 4. (Requirement 3)\n\n**Which aircraft are affected\n\n- All Airbus A319, A320 and A321 aeroplanes, all models and serial numbers, except those that already had Airbus modification 26065 incorporated during production or that already embodied SB A320‑24‑1092 (Revision 4) (Applicability). In short: if your aeroplane hasn't had the modification or SB embodied, this AD applies.\n\n**Timing / compliance\n\n- The AD sets different compliance windows for the separate requirements (these are historic deadlines tied to prior AD effective dates). The document identifies Requirements 1 and 2 with an earlier compliance window and Requirement 3 with a later one (see the AD's Compliance section). The Amendment itself became effective 20 March 2012.\n\n**Why the change was mandated (the stated safety concern)\n\n- The manufacturer’s service bulletin and the AD say the relay 11QG, when located in relay box 103VU, is exposed to a risk that water ingress into that relay box could cause a failure that simultaneously cuts off fuel to both engines via the low pressure shut‑off valves. Relocating the relay to shelf 95VU reduces that exposure. Revision 4 of the SB added an additional post‑relocation test to confirm correct operation.\n\n**How this affects operators (costs, decisions and administrative points)\n\n- Who pays and who acts: aircraft operators and their maintenance organisations must do the work (relocation, contact check/possible replacement, and the post‑relocation test). That means labour hours, parts (if contacts need replacing), scheduling of maintenance slots and associated downtime.\n- Compliance burden: operators must follow the detailed instructions in the referenced SB revisions, record the work in maintenance logs, and ensure the correct parts are used. Aircraft already compliant with earlier AD A320/102 may already have done some or all tasks; the AD refers to whether prior AD work has been accomplished.\n- Risk and implementation: the work is technical and must be done to the SB instructions. The AD replaces the earlier AD/A320/102 and points operators to SB Revision 4 for the required test; earlier SB Revisions 1 and 2 contained errors and were superseded (Background). That creates an implementation risk if maintainers rely on older, erroneous instructions — the AD forces adherence to the corrected Revision 4.\n\n**Trade‑offs and incentives\n\n- Safety benefit (concentrated): reduces the specific failure mode that could shut off fuel to both engines. The benefit is concentrated on operators, crew and passengers of affected aeroplanes.\n- Cost burden (diffuse): the immediate costs (labour, parts, down time) fall on operators. There is no direct effect on market competition, ownership or contract rights beyond the usual regulatory requirement to comply with an airworthiness directive.\n\n**Practical notes for operators\n\n- Check whether your aeroplane already has Airbus mod 26065 or SB A320‑24‑1092 Revision 4 embodied; if so, no further action under this AD is required (Applicability).\n- If your aeroplane had only the original SB or Revision 1/2, you must both verify the terminal block contacts (and replace them if necessary) and ensure the relay relocation and the Revision 4 post‑relocation test are done.\n\n(References in this summary: Applicability; Requirements 1–3; Compliance; Background.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test","history":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test/history","analysis":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test/analysis","conflicts":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test/conflicts","importantCases":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test/important-cases","documents":"/api/acts/ad-a320-140-amdt-1-relay-11qg-relocation-test/documents"}}