AD 98-21-25
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | Jetstream 3201 | Airworthiness Directives; British Aerospace Jetstream Models 3101 and 3201 Airplanes |
| aircraft | British Aerospace Regional Aircraft | Jetstream Series 3101 | Airworthiness Directives; British Aerospace Jetstream Models 3101 and 3201 Airplanes |
Unsafe Condition
Failure of the ground inhibit relay while in the energized position caused by the current design, which could result in failure of the stall warning system and possible loss of control of the airplane in certain situations if the crew was not aware that the system had failed.
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Required Actions
Remove the ground inhibit time delay and the ground test relay from the stall warning and protection system, rewire part of the system to maintain reliance after relay removal, and re-test if previous service bulletin was used. Compliance must follow British Aerospace Jetstream Alert Service Bulletin 27-A-JM7847, Revision 1.
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Compliance Time
within the next 100 hours time-in-service (TIS) after the effective date of this AD, unless already accomplished
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Affected Aircraft
Jetstream Models 3101 and 3201 airplanes, all serial numbers, certificated in any category, equipped with the ground inhibit function (Modification JM7813A (SB 27 JM813A) or JM7813B)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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