Airworthiness Directive · Amendment 39-21129 · Engine exhaust
Learjet Inc. Airplanes
This AD applies to Learjet Inc. Model 60 airplanes, serial numbers 60-001 through 60-430 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Learjet Inc. Model 60 airplanes. This AD was prompted by a report of a reverse thrust command accelerating the airplane instead of decelerating the airplane. The acceleration with reverse thrust commanded occurred when the thrust reverser doors were in the stowed position instead of the deployed position. This AD requires installing a thrust reverser (T/R) Voice Command Warning System (VCWS) to alert the crew of a T/R malfunction. The FAA is issuing this AD to address the unsafe condition on these products.
Within the next 1,200 hours time-in-service or within the next 48 months after June 25, 2020 (the effective date of this AD), whichever occurs first, install a Thrust Reverser Voice Command Warning System and perform a functional test in accordance with sections 3.A. through 3.C. of the Accomplishment Instructions in Bombardier Learjet 60 Service Bulletin SB 60-78-9, dated June 25, 2018.
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
