AD 99-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A320-111 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-211 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-212 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-214 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-231 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-232 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
| aircraft | Airbus | A320-233 | Airworthiness Directives; Airbus Industrie Model A320 Series Airplanes |
Unsafe Condition
Malfunction of the low pressure non-return valve in the airborne ground check module (AGCM) of the ram air turbine (RAT), which could result in loss of the blue hydraulic system and consequent loss of certain flight control and electrical systems.
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Required Actions
Replace the disc valve and spring in the low pressure non-return valve in the AGCM with a new poppet, and re-identify the AGCM name plate in accordance with specified service bulletins. Compliance must be accomplished within 12 months after the effective date of this AD.
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Compliance Time
Within 12 months after the effective date of this AD
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Affected Aircraft
Airbus Model A320 series airplanes, except those with Modification 27728/27189 installed in production or where Service Bulletin A320-29-1086 has been accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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