Airworthiness Directive · Amendment 39-14393 · Learjet Model 45 Airplanes
Learjet Model 45 Airplanes
This AD applies to Learjet Model 45 airplanes, certificated in any category; serial numbers (S/Ns) 45-005 through 45-273 inclusive, and 45-2001 through 45-2029 inclusive.
The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 45 airplanes. This AD requires modifying the electrical wire bundle for the alternator on the left-hand engine, inspecting for clearance between wire harnesses and engine tubing for each engine, and corrective actions if necessary. For certain airplanes, this AD also requires replacing the fuses for the hydraulic shutoff valves with fuses having higher amperage. This AD results from a report of a fire in the left-hand engine nacelle. We are issuing this AD to prevent chafing between the wire bundle for the alternator on each engine and the hydraulic lines, which could result in a fire in the engine nacelle.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 50 flight hours after the effective date of this AD: Modify the electrical wire bundle for the alternator on the left-hand engine; and do a general visual inspection of the left and right engines to make sure that the proper clearances are maintained between all wiring harnesses and engine tubing. Correct improper clearances before further flight. Do all actions in accordance with the Accomplishment Instructions of the applicable service bulletin in paragraph (f)(1) or (f)(2) of this AD.
(1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-2029 inclusive: Bombardier Alert Service Bulletin SB A40-71-01, dated September 29, 2005.
(2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-273 inclusive: Bombardier Alert Service Bulletin SB A45-71-4, dated September 29, 2005.
Note 1: For the purposes of this AD, a general visual inspection is: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
For airplanes with S/Ns identified in paragraphs (g)(1) and (g)(2) of this AD: Before or concurrently with the modification required by paragraph (f) of this AD, replace the fuses for the hydraulic shutoff valves with fuses having higher amperage in accordance with the Accomplishment Instructions of the applicable service bulletin in paragraph (g)(1) or (g)(2) of this AD.
(1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-2015 inclusive: Bombardier Service Bulletin SB 40-24-01, dated April 22, 2005.
(2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-254 inclusive: Bombardier Service Bulletin SB 45-24-6, dated April 22, 2005.
Although Bombardier Alert Service Bulletin SB A40-71-01, dated September 29, 2005; and Bombardier Alert Service Bulletin SB A45-71-4, dated September 29, 2005; specify sending a compliance report to the manufacturer, this AD does not include that requirement.
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
