{"id":"F2006B01853","name":"AD/A320/104 - Flight Controls - Inspection and Modification of Spoiler Servocontrols","slug":"ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41049,"registerId":"commonwealth-F2006B01853-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/104 - Flight Controls - Inspection and Modification of Spoiler Servocontrols","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAirbus Industrie A319, A320 and A321 Series Aeroplanes\n\nAD/A320/104 Flight Controls \\- Inspection and Modification\n\nof Spoiler Servocontrols\n\n  \n11/99\n\nApplicability: All Airbus Industrie model A319 (MSN 0546 to 0972 (inc)), A320 (MSN 002 to 0842, 0846 to 0859, 0865, 0866, 0872 to 0960 (inc)) and A321 (MSN 0364 to 0974\n\n(inc)) aircraft.\n\nRequirement: 1. For A319 and A321 aircraft, inspect the servocontrol for serial number identification and apply, if necessary, the corrective actions in accordance with the instructions contained in AIRBUS INDUSTRIE Service Bulletin A320-27-1126.\n\n2. For A320 aircraft, inspect the servocontrol for serial number identification and apply, if necessary, the corrective actions in accordance with the instructions contained in AIRBUS INDUSTRIE Service Bulletin A320-27-1127.\n\nNote: DGAC AD 1999-362-139 (B) dated 8 September 1999 refers.\n\nCompliance: 1. Before 30 November 1999.\n\n2. Before 31 December 2001.\n\nThis Airworthiness Directive becomes effective on 4 November 1999.\n\nBackground: Several cases of spoiler servo control piston rod bearing breakage were experienced leading in almost all cases to the associated hydraulic system loss and spoiler extension in flight to the zero hinge moment position. This condition could lead to a transient perturbation of the aircraft flight path and to a reduction in handling qualities.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No scope change is recorded in the source text. The directive applies to the specified A319/A320/A321 serial ranges and mandates inspection and corrective action per the cited Airbus service bulletins within the stated compliance dates."},"complexity_factors":["Multiple model and serial-number applicability increases tracking and fleet-scheduling burden (Applicability).","Different manufacturer Service Bulletin references for A319/A321 versus A320 require distinct maintenance workscopes (Requirement).","Two separate compliance dates create staging and planning constraints for operators (Compliance).","Safety-critical nature of spoiler servocontrols raises certification and quality-control demands on maintenance providers (Background).","Cost and downtime borne by operators for inspections and any replacement/modification work (Requirement/Compliance)."],"plain_english_summary":"Mandates inspection and, if necessary, modification of spoiler servocontrols on the listed Airbus A319/A320/A321 aircraft, requiring operators to follow Airbus Service Bulletin A320-27-1126 or A320-27-1127. \n\nAffects aircraft operators and approved maintenance organisations who must check serial numbers and carry out corrective work by the specified deadlines to address piston-rod bearing breakage that can cause spoiler extension and transient flight-path perturbations."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspections and modifications for spoiler servocontrol failures."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability groups (A319/A321 vs A320)","Simple conditional structure: inspect, identify serial number, apply corrective action if needed","Two distinct compliance deadlines based on aircraft model","No nested exceptions or cross-references to other legislation beyond a single reference to a French aviation authority directive (DGAC AD 1999-362-139)","Requirements reference external technical documents (Airbus Service Bulletins) rather than containing technical specifications within the text itself"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of certain Airbus A319/A320/A321 (specific manufacturer serial numbers) to inspect spoiler servocontrols and, where affected serial-numbered parts are found, perform corrective modifications. It responds to piston-rod bearing breakages that can leak hydraulic pressure and cause spoilers to extend uncontrollably in flight — a safety risk to handling and flight path control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols","history":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols/history","analysis":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols/analysis","conflicts":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols/conflicts","importantCases":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols/important-cases","documents":"/api/acts/ad-a320-104-flight-controls-inspection-and-modification-of-spoiler-servocontrols/documents"}}