{"id":"F2006L00114","name":"AD/A320/162 Amdt 1 - Integrated Standby Instrument System","slug":"ad-a320-162-amdt-1-integrated-standby-instrument-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57987,"registerId":"commonwealth-F2006L00114-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/A320/162 Amdt 1 | Integrated Standby Instrument System | 2/2006 |\n| ------------------ | ------------------------------------ | ------ |\n\n| Applicability: | Airbus A318, A319, A320 and A321 aeroplanes, all serial numbers, fitted with Airbus Modification 27620 during production or Airbus Service Bulletin (SB)A320-34-1261 embodied whilst in service and that have not had modification 35536 installed during production or SB A320-34-1335 embodied whilst in service.                                                                                                                                                                                                           |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform a reset of Integrated Standby Instrument System (ISIS) according to the following procedure:                                                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | (i) Open the NAV/STBY/HORIZON circuit breaker on the 49VU panel (5FN, location F12) for more than 5 seconds, then close it.                                                                                                                                                                                                                                                                                                                                                                                                   |\n|                | (ii) After some seconds, the INIT page comes into view.                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | Caution: Do not reset ISIS in flight.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | A complete electrical shut down of the aircraft is also sufficient to reset ISIS and is an alternative means to the above procedure.                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | Note: DGAC F-2004-168 R1 (EASA Approval 2005-6439) refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Compliance:    | Remains unchanged as ‘Within three calendar days after the effective date of this Directive, but not exceeding five calendar days from the last ISIS reset or aeroplane complete power off, and thereafter at intervals not exceeding five calendar days’.                                                                                                                                                                                                                                                                    |\n|                | This Amendment becomes effective on 16 February 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Background:    | An A340 operator reported the loss of ISIS followed, during the same flight, by the loss of all Electronic Instrument System (EIS) Display Units (DU). A318, A319, A320 and A321 aeroplanes may be fitted with the same design. The failure mode of ISIS has been identified as a time counter fault after 145 hours of ISIS continuous power supply. AD/A320/157 Amdt 1 (DGAC AD F-2004-104 R1) mandates the operational procedure to recover lost EIS Display Units, pending a new EIS standard addressing the misbehavior. |\n\n|     | Situations where EIS DUs and ISIS are simultaneously unavailable may result in hazardous consequences in certain phases of flight. The original issue of this Directive required a periodic on ground-reset procedure to prevent the ISIS failure by clearing the time counter. This Amendment continues that requirement but reduces the scope of the applicability. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|     | The original issue of this Directive became effective on 25 October 2004.                                                                                                                                                                                                                                                                                             |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n20 December 2005","sortOrder":0},{"sectionNumber":"AD/A320/162 Amdt 1","sectionType":"part","heading":"AD/A320/162 Amdt 1","content":"## AD/A320/162 Amdt 1","sortOrder":1},{"sectionNumber":"Integrated Standby Instrument System","sectionType":"part","heading":"Integrated Standby Instrument System","content":"## Integrated Standby Instrument System","sortOrder":2},{"sectionNumber":"2/2006","sectionType":"part","heading":"2/2006","content":"## 2/2006","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":4,"scope_assessment":{"changed":true,"description":"Yes. The Amendment narrows which aeroplanes must comply: applicability is limited to Airbus A318/A319/A320/A321 aeroplanes fitted with Airbus Modification 27620 during production or SB A320-34-1261 embodied in service, and that have not had Modification 35536 installed or SB A320-34-1335 embodied (Applicability). The Amendment states it \"reduces the scope of the applicability\" compared with the original Directive which required the periodic on-ground reset for affected aircraft generally (Background)."},"complexity_factors":["Conditional applicability: applies only to A318/A319/A320/A321 aeroplanes fitted with Mod 27620 or SB A320-34-1261 and that have not had Mod 35536 or SB A320-34-1335 (Applicability).","Specific procedural step with exact breaker location and timing: open NAV/STBY/HORIZON circuit breaker on 49VU panel (5FN, location F12) for >5 seconds then close it (Requirement (i)).","Operational timing and recurrence constraint: initial reset window and recurring maximum interval of five calendar days (Compliance).","Safety operational constraint: explicit prohibition on performing the reset in flight (Requirement - Caution), creating a ground-only compliance burden.","Alternative compliance method provided (complete electrical shutdown) which affects operational choices and scheduling (Requirement - alternative).","Underlying technical cause and failure timing: ISIS time-counter fault after ~145 hours continuous power, risk tied to accumulated powered hours (Background).","Cross-references to existing airworthiness directives and EASA/DGAC approvals, requiring alignment with other regulatory materials (Note; Background referencing AD/A320/157 and DGAC F-2004-168 R1 / EASA Approval 2005-6439).","Amendment narrows applicability relative to the original directive, requiring careful fleet applicability assessment to determine which aircraft need the procedure (Background: 'reduces the scope of the applicability')."],"plain_english_summary":"Requires operators of certain Airbus A318/A319/A320/A321 aeroplanes fitted with a particular standby‑instrument configuration to perform a ground reset of the Integrated Standby Instrument System (ISIS) at intervals not exceeding five days (or after a complete power‑off). The reset is done by opening the NAV/STBY/HORIZON circuit breaker on the 49VU panel or by a full electrical shutdown. It affects airline maintenance and operational scheduling because the procedure must be performed on the ground and not in flight."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This Amendment 1 narrows the scope compared to the original directive issued in October 2004. The original applied more broadly, while this version excludes aircraft that have received the permanent fix (Modification 35536 or SB A320-34-1335). The core requirement remains the same (periodic reset), but fewer aircraft are now captured by the mandate."},"complexity_factors":["Highly specific technical applicability criteria involving multiple Airbus modification numbers and service bulletins","Precise procedural requirements with specific panel locations (49VU, 5FN, F12) and timing (5 seconds, 5 days)","Cross-reference to French aviation authority documentation (DGAC F-2004-168 R1) and EASA approval number","Nested conditional logic: applies to aircraft WITH certain modifications AND WITHOUT other modifications","Technical aviation terminology throughout (ISIS, EIS, DU, circuit breaker designations, modification numbers)"],"plain_english_summary":"This AD requires operators of certain Airbus A318/A319/A320/A321s with an older ISIS installation (no permanent fix) to regularly reset the Integrated Standby Instrument System to prevent a software bug that causes failure after 145 hours continuous power. The reset (or a full power-down) must be done on the ground at least every five days and never in flight. It’s a temporary, mandatory workaround until the permanent modification is installed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system","history":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system/history","analysis":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system/analysis","conflicts":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system/conflicts","importantCases":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system/important-cases","documents":"/api/acts/ad-a320-162-amdt-1-integrated-standby-instrument-system/documents"}}