Airworthiness Directive · Amendment 39-15923 · Hydraulic power
Learjet Model 45 Airplanes
Superseded. A later AD replaced this one: AD 2011-13-10. Comply with the one in force.
This AD applies to Learjet Model 45 airplanes, certificated in any category, serial numbers 45-002 through 45-4000 inclusive.
We are adopting a new airworthiness directive (AD) for certain Learjet Model 45 airplanes. For certain airplanes, this AD requires repetitive inspections for chafing and other damage of the case drain tube from the hydraulic pump case installed on the left-hand engine, and corrective action if necessary. This AD also requires, for all airplanes, repetitive inspections for discrepancies of the left engine's nacelle tubing, repetitive inspections for evidence of fluid leakage within the left engine accessory compartment, and corrective actions if necessary. This AD was prompted by reports of chafed hydraulic tubes in the left-hand engine. We are issuing this AD to detect and correct chafed hydraulic tubes in the left-hand engine and consequent hydraulic tube failure and uncontrolled loss of flammable fluid within the engine cowling, which could result in a fire in the engine nacelle and loss of control of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
For airplanes having serial numbers identified in Table 1 of this AD: Within 50 flight hours after the effective date of this AD, do a detailed inspection for chafing and other damage of the case drain tube from the hydraulic pump case installed on the left-hand engine, in accordance with the applicable service bulletin identified in Table 1 of this AD. If any damage is found, before further flight, reposition or replace the tube, as applicable, in accordance with the Accomplishment Instructions of the service bulletin identified in Table 1 of this AD, as applicable. Repeat the inspection thereafter at intervals not to exceed 150 flight hours.
| For— | Use— |
|---|---|
| Serial numbers 45-005 through 45-313 inclusive (commonly referred to as “M45” airplanes) | Bombardier Alert Service Bulletin A45-29-15, dated December 26, 2006. |
| Serial numbers 45-2001 through 45-2063 inclusive (commonly referred to as “M40” airplanes) | Bombardier Alert Service Bulletin A40-29-03, dated December 26, 2006. |
Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
Within 50 flight hours after the effective date of this AD, do a detailed inspection for discrepancies of the left engine's nacelle tubing, in accordance with the applicable temporary revision (TR) identified in Table 2 of this AD. Discrepancies include damaged tubing, and inadequate clearance between any unsupported section of the tube or other tubing and surrounding components. If any discrepancy is found, before further flight, adjust the tubing and clamping or replace the tubing, as applicable, in accordance with the applicable TR identified in Table 2 of this AD. Repeat the inspection thereafter at intervals not to exceed 150 flight hours.
| For— | Use— |
|---|---|
| Serial numbers 45-2001 through 45-4000 inclusive (commonly referred to as “M40” airplanes) | Learjet 40 TR 71-1, dated April 28, 2009, to the Learjet 40 Maintenance Manual MM-105. |
| Serial numbers 45-002 through 45-2000 inclusive (commonly referred to as “M45” airplanes) | Learjet 45 TR 71-1, dated April 28, 2009, to the Learjet 45 Maintenance Manual MM-104. |
(i) Concurrently with each inspection required by paragraph (h) of this AD, do a detailed inspection for evidence of engine oil, hydraulic fluid, or fuel leakage within the left engine accessory compartment, in accordance with the applicable maintenance manual section identified in Table 3 of this AD. If there is evidence of leakage: Before further flight, remove each plumbing clamp within the inspection areas specified in paragraphs (g) and (h) of this AD, and clean and remove all evidence of fluid leakage.
| For— | Use— |
|---|---|
| Serial numbers 45-002 through 45-2000 inclusive (commonly referred to as “M45” airplanes) | Section 71-00-00, “Powerplant—Maintenance Practices,” and Section 71-00-01, “Engine—Maintenance Practices,” of the Learjet 45 Maintenance Manual MM-104, Revision 47, dated March 30, 2009. |
| Serial numbers 45-2001 through 45-4000 inclusive (commonly referred to as “M40” airplanes) | Section 71-00-01, “Engine—Maintenance Practices,” of the Learjet 40 Maintenance Manual MM-105, Revision 15, dated March 30, 2009. |
If evidence of fluid leakage was found during any inspection required by paragraph (i) of this AD, or, if inadequate clearance was found during any action required by paragraph (g) or (h) of this AD: Before further flight, replace each clamp associated with the fluid leakage or inadequate clearance with a new clamp, in accordance with the applicable maintenance manual identified in Table 3 of this AD.
As of the effective date of this AD, no person may re-install, on any airplane, any plumbing clamp that has been removed in accordance with the requirements of this AD.
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
