AD 98-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | A300 B4-601 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-603 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-605R | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-620 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-622 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 B4-622R | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 C4-605R Variant F | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 F4-605R | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A300 F4-622R | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
| aircraft | Airbus | A310-203 | Airworthiness Directives; Airbus Model A310 and A300-600 Series Airplanes |
Unsafe Condition
Desynchronization of the hydraulic control valves of the trimmable horizontal stabilizer (THS) actuator could result in runaway of the horizontal stabilizer to its full up or down position, subsequent reduced maneuvering capability, and potential pitch upset.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the hydraulic motor of the THS with an improved motor; inspect synchronization of the hydraulic control valves at intervals not to exceed 500 hours time-in-service; adjust synchronization and perform functional tests if desynchronization occurs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required as indicated, unless accomplished previously.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus Model A310 and A300-600 series airplanes on which Airbus Modification 11607 has not been installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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