U.S. Department 

of Transportation 

Federal Aviation 

Administration 

Date: June 16, 2015 

Small Airplane Directorate 

Wichita Aircraft Certification Office 

1801 Airport Road, Room 100 

Wichita, Kansas 67209 

Reply to Letter# L 115W -15-423 

Dear Lea1jet Owner/Operator: 

Subject: Global Method of Compliance (MOC) for paragraph (h) of Airworthiness 

Directive (AD) 2015-12-06 

This memo provides a method of compliance (MOC) to paragraph (h), 

"Maintenance/Inspection Program Revision" of AD 2015-12-06. This MOC is applicable to 

Model45 airplanes: (Learjet 40, Serials 45-2000 through 45-2120 inclusive and 45-2122 

through 45-2130 inclusive) or (Learjet 45, Serials 45-005 through 45-427). 

Paragraph (h) of AD 2015-12-06 requires, within 30 days after the effective date of AD 

2015- 12-06, revising the maintenance or inspection program, as applicable, to incorporate 

inspection reference number (IRN) task nwnber U5323 167, and U5323168 or V5323 168, as 

applicable, into the Airworthiness Limitations of the applicable maintenance manual, in 

accordance with a method approved by the Manager, Wichita Aircraft Certification Office 

(ACO), ACE-11 5W, FAA. 

This letter approves incorporating Chapter 4 Airworthiness Limitations as a method of 

compliance to paragraph (h) of AD 2015-12-06, provided the limitations include the 

following: 

Learjet 45 Maintenance Manual 

s cchon 4 -10 -01 c crh .fi Icahon M. amtenance R eqmremcnts - s tructure Ch ec ks 

IRN- Zone/ Maintenance Requirements -Structure 

Interval Access Checks -

U5323 168 * LH and RH Lower Coupe Rail Radius/ 

or Windscreen Retainer Attach (PIN's 4553 130001- 5,000 flight 

V5323 168 220 802 thru 4553 130001-809)- Perform Eddy hours initial, 

Current Inspection (Effective on Aircraft that have 5000 flight 

complied with SB 45-56-3, "Windows - hours repeat 

Windshield Coupe Rail Inspection.") 
Page2 

Learjet 40 Maintenance Manual 

S ec f IOn 4 1- 0 -01 C er ffi 1 aca f aon M am . t enance R equaremen t s - St rue t ure Ch ec ks 

IRN - Zone/ Maintenance Requirements - Structure 

Access Interval 

ChecksU5323168 * LH and RH Lower Coupe Rail Radius/ 

or Windscreen Retainer Attach (PIN's 4553130001- 5,000 flight 

V5323168 220 802 thru 4553130001 -809) - Perform Eddy hours initial, 

Current Inspection (Effective on Aircraft that have 5000 flight 

complied with SB 40-56-03, "Windows - hours repeat 

Windshield Coupe Rail Inspection.") 

Learjet 45 Maintenance Manual and Learjet 40 Maintenance Manual 

Section 4-11-00 

anvor th" mess L a" m a "t a f IOns - R · epl J acemcn tR eqmr emcnts 

IRN - Zone/ Replacement Requirement - Interval Access 

600 Hours I 

U5323167 220 * LH & RH Coupe Rails (PIN 4553002003V7000- 36 Months, 

001, 4553002003V7001-002) whichever 

occurs first. 

The eddy current inspection is specified in Bombardier Recommended Service Bulletins SB 

45-56-3 Rev. 1, Section 3.B.(9) and SB 40-56-03 Rev. 1, Section 3.B.(9). The service 

bulletin action may not have occutTed during a 5,000 flight hour phase interval, however, the 

next eddy current inspection shall be aligned with the 5000 flight hour recurring inspections. 

Utilize the eddy current inspection as referenced in Section 3.B.(9). 

Only three airplanes were affected by IRN U5323167 and Learjet has replaced all of the 

affected coupe rails. The affected airplanes are SIN 45-428, 45-432 and 45-2121 . 

Compliance to paragraph (h), "Maintenance /Inspection Program Revision" of AD 2015-12-

06 may be achieved by utilizing: 

1. Bombardier Learjet 40 Maintenance Manual MM-105, Revision 25, dated 

June 11, 2012 or later FAA approved revision. 

2. Or Bombardier Learjet 45 Maintenance Manual MM-104, Revision 57, dated 

June 11, 2012 or later FAA approved revision. 

3. Or incorporating the IRN's listed above into your FAA approved inspection 

program. 

The Wichita Aircraft Certification Office approves the method of compliance herein to 

paragraph (h) of AD 2015-12-06. 
Page 3 

The following conditions apply: 

I. All provisions of AD 2015-12-06 that are not specifically referenced above 

remain fully applicable and must be complied with accordingly. 

2. This approval is applicable only to: 

a. Model 45 airplanes: (Learjet 40, Serials 45-2000 through 45-2120 

inclusive and 45-2122 through 45-2130 inclusive). 

b. Model 45 airplanes: (Learjet 45, Serials 45-005 through 45-427). 

3. This approval is based on data from the following publications used to establish 

an acceptable level of safety: 

a. Bombardier Learjet 40 Maintenance Manual MM- 1 05, Revision 25, dated 

June II, 2012 or later FAA approved revision. 

b. Bombardier Learjet 45 Maintenance Manual MM-104, Revision 57, dated 

June 11 , 2012 or later FAA approved revision. 

c. Bombardier Learjet 40 Recommended Service Bulletin 40-56-03, 

Revision 1, dated October 15, 2012. 

d. Bombardier Learjet 45 Recommended Service Bulletin 45-56-3, 

Revision 1, dated October 15, 2012. 

4. This approval is transferable with the aircraft to an operator who operates the 

aircraft under U.S. registry. 

Before using this MOC, notify your appropriate principal inspector, or lacking a principal 

inspector, the manager of the local flight standards district office/certificate holding district 

office. 

foreign registered aircraft should make request directly to their specific civil aviation 

authority (CAA). 

Should you have any questions, please contact this office at telephone number (316) 946-

4152 email paul.chapman@faa.gov. 

Sincerely, 

Margaret Kline 

Manager, Wichita Aircraft Certification Office 

Cc: EASA: ads@easa.europa.eu 

Transport Canada: derek.ferguson@tc.gc.ca