AD 98-21-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | Jetstream Series 3101 | Airworthiness Directives; British Aerospace Jetstream Model 3101 Airplanes |
Unsafe Condition
The elevator trim servo motor drive gear assembly may remain engaged when the autopilot is disengaged, which could result in the pilot having to manually overpower the elevator trim control and possibly lose directional control of the airplane during critical phases of flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the elevator trim servo motor with a new motor of improved design; inspect the cable tension, system friction, and electric trim manual override, and make any necessary adjustments in accordance with specified service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time-in-service (TIS) after the effective date of this AD
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Affected Aircraft
British Aerospace Regional Aircraft Jetstream Model 3101 airplanes with serial numbers 601, 603, 604, 606, 607, 609, 610, 612, 614, 616, 620, 621, 622, 626, 629, 634, 637, 641, 645, 648, 649, 655, 665, 686, 690, equipped with an autopilot.
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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