Airworthiness Directive · Amendment 39-14599 · Learjet Model 45 Airplanes
Learjet Model 45 Airplanes
This AD applies to Learjet Model 45 airplanes, serial numbers 45-005 through 45-295 inclusive, and 45-2001 through 45-2044 inclusive; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Learjet Model 45 airplanes. This AD requires a review of airplane maintenance records to determine whether inspections identified by certain inspection reference numbers (IRNs) have been done. If any IRN has not been done, this AD requires doing an inspection of the inside of the wet wing fuel areas and the fuel pump screens for tape and adhesive tape residue, cleaning the low pressure fuel filter, determining whether tape or adhesive residue is present, doing an inspection of the filter for damage before installation, and applicable corrective actions if necessary. In addition, this AD requires sending the review and inspection results to the FAA. This AD results from reports of tape found in the wing fuel tanks. We are issuing this AD to prevent blocked fuel passages and fuel pump screens and the inability of the flightcrew to transfer fuel from one wing tank to the other tank due to tape in the wing fuel tanks, which could result in a fuel imbalance and consequent failure of an engine; and to prevent contaminated fuel pump screens, engine fuel controls, and fuel nozzles, due to tape adhesive dissolving in the fuel, which could result in potential erroneous readings of the fuel quantity indication system.
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 or 30 days after the effective date of this AD, whichever occurs first, review the airplane maintenance records to determine whether inspections identified by the inspection reference numbers (IRNs) in paragraphs (f)(1) and (f)(2) of this AD have been done.
(1) IRN O2810001, Inspection/Service Requirement, “Wing Tanks “ Perform Visual Inspection. Inspect for corrosion. (Refer to 5-10-00.),” of Bombardier Learjet 45 M45 Maintenance Manual.
(2) IRN O2820000, Inspection/Service Requirement, “Low Pressure Fuel Filter “ Remove and inspect for contamination. Clean if necessary. (Refer to 28-20-15.),” of Bombardier Learjet 45 M45 Maintenance Manual.
During the records review required by paragraph (f) of this AD, if it cannot be positively determined whether both IRNs have been done: Except as provided by paragraph (h) of this AD, within 50 flight hours or 30 days after the effective date of this AD, whichever occurs first, do the actions specified in paragraphs (g)(1) and (g)(2) of this AD in accordance with a method approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA. Chapters 5-10-00 and 28-20-15, as applicable, of the Bombardier Learjet 45 M45 Maintenance Manual are approved methods.
(1) Do a general visual inspection of the inside of the wet wing fuel areas and the fuel pump screens for tape or adhesive tape residue.
(2) Clean the low pressure fuel filter, determining whether tape or adhesive tape residue is present, and do a general visual inspection of the filter for damage before installation.
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.”
(h) As of the effective date of this AD: If a crew alert system message of “L FUEL FILTER, R FUEL FILTER, LR FUEL FILTER, L FUEL PRESS LOW, R FUEL PRESS LOW, or LR FUEL PRESS LOW” occurs during flight or on the ground, do the actions required by paragraph (g) of this AD before further flight, unless those actions have already been done.
(i) If any tape or adhesive tape residue is found during the general visual inspection required by paragraph (g)(1) or during the cleaning required by paragraph (g)(2) of this AD, before further flight, do the actions specified in paragraphs (i)(1) and (i)(2) of this AD.
(1) Clean the wing fuel tank in accordance with a method approved by the Manager, Wichita ACO. Chapter 20-71-00 of the Bombardier Learjet 45 M45 Maintenance Manual is one approved method.
(2) Service the affected engine fuel filter and return any engine fuel control subjected to contaminated fuel for servicing to Honeywell Engines. Coordinate the return of the engine fuel control with Honeywell Engines, Systems & Services, Customer Support Center, M/S 26-06/2102-323, P.O. Box 29003, Phoenix, Arizona 85038-9003; telephone (800) 601-3099 or (602) 365-3099; fax (602) 365-3343.
(j) If any damage is found during the general visual inspection required by paragraph (g)(2) of this AD, before further flight, do the applicable action specified in paragraph (j)(1) or (j)(2) of this AD in accordance with a method approved by the Manager, Wichita ACO. Chapter 28-20-15 of the Bombardier Learjet 45 M45 Maintenance Manual is one approved method.
(1) For damage that is repairable: Repair damaged filter.
(2) For damage beyond repair: Replace the damaged filter with a new filter.
Within 10 days after accomplishing the review required by paragraph (f) of this AD or the general visual inspection required by paragraph (g) of this AD if done, whichever occurs later, submit a report of the applicable review and inspection results to: James Galstad, Aerospace Engineer, Systems and Propulsion Branch, ACE-116W, FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209; e-mail james.galstad@faa.gov; telephone (316) 946-4135; fax (316) 946-4107. Information collection requirements contained in this AD have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056. The report must include the following, as applicable:
(1) The airplane serial number;
(2) The number of flight hours on the airplane;
(3) The applicable review and inspection results (both positive and negative findings), including a description, pictures, and pertinent information for any tape or adhesive tape residue found in the wing tank(s); and
(4) Date of inspection of the wing tank(s).
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
