### U.S. Department of Transportation Federal Aviation Adm in istra tio n

Date: June 16, 2015 Small Airplane Directorate Wichita A ircraft Certification Office 1 801 Airport Road , Room 100 Wichita , Kansas 67209 Reply to Letter# L 115W-15-423
Dear Lea1jet Owner/Operator: Sub j ec t: G loba l Method of Compliance (MOC) for paragraph (h) of Airworthiness Direc tiv e (AD) 2015 -12-06
This memo provides a method of comp liance (MOC) to paragraph (h),
" Maintenance /In spect ion Program Re visio n " of AD 2015-12-06. Thi s MOC is applicable to Model45 a irp lanes: (Learjet 40 , Serials 45

- 2000 through 45-2120 inclus ive and 45-2122 through 45

- 2130 incl u s ive) or (Lea rj et 45, Serials 45-005 th ro ug h 45- 4 27). Paragraph (h) of AD 2015 -1 2

- 06 requires, withi n 30 days after the effec ti ve date of AD 2015- 12-06 , revi s ing th e maintenance or inspection program , as appl icab le , to incorporate inspection reference number (IRN) task nwnber U5323 167 , and U5323168 o r V5323 168 , as app li cab le, into the Airworthiness Limitations of the app li cable maintenance manual, in accordance with a method approved by the Manager , Wichita Aircraft Certification O ffice (ACO), ACE -11 5W, FAA. T hi s letter approves incorporat in g Chapter 4 A irworthiness Limitati ons as a method of comp li ance to paragraph (h) of AD 2015 -1 2 -0 6 , provided the limita tion s include the f o ll ow in g: 

### Learjet 45 Maintenance M anu al 

# scch o n 4 10 01 

## c
. fi 

# - - crh Icahon 

### M. amtenance R eqmremcnts - 

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### ec IRN- 

### Zone/ Maintenanc e Requirem ents -Structure Interva l Access C h ecks

- U5323 1 68 

## * LH and RH Lower Coupe Rail Radiu s/ or Wi nd screen Retainer Attach (PIN's 4553 13000 1

- 5,000 fli ght V5323 168 220 802 thru 4553 1 30001-809)- Perfo rm Eddy hours initial , Current Inspection (Effect ive on Airc raft that have 5000 flight complied with 

### SB 45-56-3 , "W indows

- hours repeat Windshield Coupe Ra il Inspection. " )Page2
Lear j et 4 0 Ma in te n a n ce M a n ual S f 4 1 0 01 C ffi f M . t

ec IOn 

# - - er 1 a c a aon a m enance R t St t eq uaremen s - rue ure Ch 

### ks ec I RN
- Zone/ Maintenan ce R eq ui rement s - Stru c tu re Access Interva l Check sU5323168 

## * 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 Ma intenance Manu a l an d Lear j et 40 Maintenance Manua l Section 4-11 -00 anvor th " mess L " "t f R 

### J a m a a IO n s - · ep lacemc n 

### tR eqmr emcnts IRN
- Zo n e/ Rep l acement Re qu irement

- Interva l 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. Uti l ize the eddy current inspection as referenced in Section 3.B.(9). Only three airp l anes were affected by IRN U5323167 and Learjet has replaced all ofthe 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 app ly : 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: (Learj e t 40 , Serials 45

- 2000 through 45-2120 inclusive and 45-2122 through 45-2130 inclusi ve). b. Model 45 airplanes: (Learjet 45 , Serials 45-005 through 45-427). 3. This approval is based on data from the following publication s used to establish an acceptable level of safety: a. Bombardier Learjet 40 Maintenance Manual MM- 1 05 , Revision 25 , dated Jun e II , 2012 or later FAA approved revision. b. Bombardier Learjet 45 Maintenance Manual MM-104 , Rev ision 57, dated June 11 , 2012 or later FAA approved revision. c. Bombardier Learj et 40 Recommended Service Bulletin 40-56-03, Revision 1 , dated October 15 , 2012. d. Bombardier Learjet 45 Recommended Service Bulletin 45-56-3, Revi sio n 1, dated October 15 , 2012. 4. This approval is transferab le with the aircraft to an operator who operates the aircraft unde r U.S. registry
. Before using this MOC , notify your appropriate principa l inspector, or lacking a principal inspector, the manager of the local flight standards district office /certificate holding district office. foreig n registered aircraft should make request directly to their specific civil aviation authority (CAA). Should you have any questions , please contact this office at telephone numb er (316) 

### 946- 4152 email paul.chapm an@ faa.gov. Sincerely,
Margaret Kline Manager, Wichita Aircraft Certification Office
Cc: EASA: ads @ ea sa .europa.eu Transport Canada: derek.ferguson@ tc.gc.ca