{"id":"F2006B01959","name":"AD/A320/70 - Landing Gear Retraction Control Circuit","slug":"ad-a320-70-landing-gear-retraction-control-circuit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41181,"registerId":"commonwealth-F2006B01959-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/70 - Landing Gear Retraction Control Circuit","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/A320/70 Landing Gear Retraction Control Circuit 12/96\n\nApplicability: This Directive is applicable to all model A320 series aeroplanes without Airbus Industrie modifications 21574 (PM 2025) or 21999 or Airbus Industrie Service Bulletin A320-32-1139 dated 20 September 1994 incorporated.\n\nRequirement: Replace capacitor 57GA, installed in electronic rack 90VU, in accordance with Airbus Industrie Service Bulletin A320-32-1139 Revision 1 dated 30 December 1994.\n\nNote: DGAC AD 96-187-085(B) refers.\n\nCompliance: Prior to 7 November 1997.\n\nThis Airworthiness Directive becomes effective on 7 November 1996.\n\nBackground: Some operators have reported landing gear cycle interrupts when performing functional tests of the landing gear safety valve. Investigation revealed that the interrupts were caused by the rupture of capacitor 57GA. This capacitor allows the retraction to continue following the loss of electrical power.\n\nThis Directive mandates the replacement of capacitor 57GA by an electrolyte capacitor with a tantalum casing.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1903},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope addressing a single identified safety defect (capacitor rupture in the landing gear retraction circuit). It does not expand beyond the specific technical issue identified in the background investigation."},"complexity_factors":["Single discrete maintenance action required (replacement of one identified part)","Narrow applicability limited to specific aircraft models (A319/A320/A321) with defined exclusions","Precise technical references requiring specialist knowledge (capacitor 57GA, electronic rack 90VU)","Cross-reference to manufacturer service bulletin for implementation details","No nested conditional logic or layered exceptions"],"plain_english_summary":"This mandatory safety order requires operators of Airbus A319/A320/A321 aircraft (unless already modified per Airbus mods 21574/21999 or the 1994 service bulletin) to replace capacitor 57GA in electronic rack 90VU with a tantalum‑cased unit per Airbus Service Bulletin A320‑32‑1139 Rev 1. The capacitor can rupture and interrupt the landing‑gear backup power, risking the gear stopping mid‑cycle; the replacement deadline was prior to 7 November 1997."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit","history":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit/history","analysis":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit/analysis","conflicts":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit/conflicts","importantCases":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit/important-cases","documents":"/api/acts/ad-a320-70-landing-gear-retraction-control-circuit/documents"}}