Airworthiness Directive · Amendment 39-12823 · Empresa Brasileira de Aeronautica S.A.
Empresa Brasileira de Aeronautica S.A.
Model EMB-135 and -145 series airplanes, certificated in any category; equipped with horizontal stabilizer actuator (HSA) assemblies having part numbers and serial numbers as listed in EMBRAER Service Bulletin 145-27-0088, dated February 1, 2002.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain EMBRAER Model EMB-135 and -145 series airplanes. This action requires a one-time inspection of the clutch assembly of the horizontal stabilizer actuator (HSA) to verify that at least one locking tab on the key washer is bent into the locking groove of the clutch nut, and follow-on actions. This action is necessary to prevent a loose or disengaged clutch nut on the HSA clutch assembly, which could result in loss of pitch trim and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.
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.
Appliances and equipment
