AD 99-06-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | British Aerospace Regional Aircraft | H.P. 137 Jetstream Mk. 1 | Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes |
| aircraft | British Aerospace Regional Aircraft | Jetstream 3201 | Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes |
| aircraft | British Aerospace Regional Aircraft | Jetstream Series 200 | Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes |
| aircraft | British Aerospace Regional Aircraft | Jetstream Series 3101 | Airworthiness Directives; British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 Airplanes |
Unsafe Condition
Failure of the bearings in the elevator down bias spring assembly caused by the installation of an incorrectly manufactured bias spring or damage or distortion to the assembly, which could result in reduced or loss of control of the airplane.
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Required Actions
Inspect the elevator bias spring assembly for correct installation and to ensure the correctly manufactured bias spring is installed within 100 hours time-in-service after the effective date. If an incorrectly manufactured or installed bias spring is found, rework the assembly, replace the spring, and inspect/replace distorted or damaged link assembly parts before further flight.
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Compliance Time
Within 100 hours time-in-service after the effective date
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Affected Aircraft
British Aerospace HP137 Mk1, Jetstream Series 200, and Jetstream Models 3101 and 3201 airplanes, all serial numbers.
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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