1AD/A320/70 - Landing Gear Retraction Control Circuit

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Airbus Industrie A319, A320 and A321 Series Aeroplanes

AD/A320/70 Landing Gear Retraction Control Circuit 12/96

Applicability: 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.

Requirement: Replace capacitor 57GA, installed in electronic rack 90VU, in accordance with Airbus Industrie Service Bulletin A320-32-1139 Revision 1 dated 30 December 1994.

Note: DGAC AD 96-187-085(B) refers.

Compliance: Prior to 7 November 1997.

This Airworthiness Directive becomes effective on 7 November 1996.

Background: 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.

This Directive mandates the replacement of capacitor 57GA by an electrolyte capacitor with a tantalum casing.