Airworthiness Directive · Amendment 39-9923 · Saab AB, Saab Aerosystems Airplanes
Saab AB, Saab Aerosystems Airplanes
This AD applies to Saab AB, Saab Aerosystems SAAB 340B, 340A (SAAB SF340A).
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 adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A, SAAB 340B, and SAAB 2000 series airplanes, that requires replacement of the hubcap drive coupling of the main wheel with an improved coupling. This amendment is prompted by reports of unexpected decreases in the pressure of the main wheel brake due to incorrect engagement between the main wheel coupling and the wheel speed transducer, which can result in false signals being sent to the anti-skid control box. The actions specified by this AD are intended to prevent loss of brake effectiveness due to a decrease in the pressure of the main wheel brake.
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.
Aircraft
