Airworthiness Directive · Amendment 39-12109 · Learjet Model 45 Airplanes
Learjet Model 45 Airplanes
Model 45 airplanes, certificated in any category, serial numbers 45-002 through 45-004 inclusive, 45-006 through 45- 121 inclusive, and 45-124 through 45-129 inclusive.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Learjet Model 45 airplanes. This action requires revising the airplane flight manual (AFM) to prohibit flight into known icing conditions; inspecting the anti-ice manifold assembly for missing material, and performing corrective actions if necessary; replacing the anti-ice manifold assembly with a new assembly, which terminates the AFM revision requirement; and revising the Learjet 45 maintenance program to incorporate additional inspections and maintenance practices for the anti-ice manifold assembly. This action is necessary to prevent metal fragments from breaking off the anti-ice manifold assembly due to fatigue, which could block a duct in the anti- ice system and result in an unannunciated loss of ice protection. 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.
Aircraft
