Airworthiness Directive · Amendment 39-9074 · British Aerospace Regional Aircraft Airplanes
British Aerospace Regional Aircraft Airplanes
This AD applies to British Aerospace Regional Aircraft H.P. 137 Jetstream Mk. 1, Jetstream 3201, Jetstream Series 200, Jetstream Series 3101.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes Airworthiness Directive (AD) 87-04-04 and AD 89-16-02, which currently require the following on Jetstream Aircraft Limited (JAL) HP 137 Mk1, Jetstream series 200, and Jetstream Models 3101 and 3201 airplanes: repetitively inspecting the universal joints and universal rivets, replacing any damaged part, and limiting the in-service life of the torque tube shaft assembly. JAL has introduced an improved flap torque tube shaft assembly that includes universal joints that are not life limited. The Federal Aviation Administration's policy on aging commuter-class aircraft is to eliminate or, in certain instances, reduce the number of certain repetitive short-interval inspections when improved parts or modifications are available. This action requires installing this improved flap torque shaft assembly in place of the repetitive inspection and life limit requirements of the two existing AD's. The actions specified by this AD are intended to prevent failure of the flap torque assembly, which could result in asymmetric flap deployment and loss of control of the airplane.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
