Transport Transports Canada Canada TP 7245E



# AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your na me. ADs are issued pursuant to Canadian Aviation Regulation (CAR) 521 Division X . Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H , the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard

. This AD has been issued b y the Continuin g Airworthiness Division ( AARDG ) , National Aircraft Certification Branch, Trans p ort Canada, Ottawa, tele p hone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. To request a change of address, contact the Civil Aviation Communicat ions Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8 , or 1-800-305-2059 , or www.tc.gc.ca/civilaviation/communications/centre/ address.asp

2 4-0022 ( 01-2005 ) 1/3 No

. CF-2011-36R1 Issue Date 3 October 2012

Number: CF-2011-36R1 Subject: Main Landing Gear – Retraction Actuator Corrosion
Effective: 18 October 2012
Revision: Supersedes Airworthiness Directive CF-2011-36, dated 10 September 2011 Applicability: Bombardier Inc. Aeroplanes: Model CL-600-2C10, serial numbers 10002 and subsequent Models CL-600-2D15 and CL-600-2D24, serial numbers 15001 and subsequent Compliance: As indicated below, unless already accomplished. Background: Corrosion of the main landing gear (MLG) retraction actuator components was found in-service, either at the interface of the rod end and the piston or at the bracket and its related pins. This can cause the MLG retr action actuator to disconnect, leading to an MLG extension without dampi ng, and a potential for MLG structural damage and possible collapse during landing. This AD mandates the inspection and rectif ication of the MLG retraction actuator components. This revision is to mandate the installation of the new retraction actuator jam nut. This revision also corrects the background info rmation and updates Service Bulletin (SB) references.
Corrective Actions: Part I - Inspection of the MLG Retraction-Actuator For any MLG retraction actuator assembly with part number and serial number listed in Paragraph 1.A. Effectivity of Bombardier SB 670BA-32-031, Revision C, dated 17 April 2012, or later revisions approved by the Ch ief, Continuing Airworthiness, Transport Canada, perform a detailed visual inspection of the retraction actuator assembly for evidence of corrosion and security of jam nu t, and rectify as applicable, in accordance with Part A of the Accomplishment Instru ctions of the above-mentioned SB using the following schedule:
A. Initially, as of the effective date of this AD:
1. For MLG retraction actuator assemb lies that have accumulated more than 8000 hours air time since new or since overhaul , or have been in service for more than 4 years since new or since overhaul: within 1200 hours air time or 12 months, whichever occurs first, from t he effective date of this AD.
2. For MLG retraction actuator assemb lies that have accumulated 8000 hours air time or less since new or since overhaul , or have been in service for 4 years or less since new or since overhaul: before reaching 9200 hours air time or 5 years into service, whichever occurs first.No. N ° CF-2011-36R1 2/3

B. Subsequently, at intervals not to exceed 1200 hours air time or 12 months, whichever occurs first. The inspection specified in Part I of this AD is not required for any retraction actuator assembly identified with Mod Status “32-64” on the identification plate. Inspection and rectification in accordance with Bombardier SB 670BA-32-031, Revision B, dated 29 July 2011, Revision A, dated 09 June 2011, or Initial Issue, dated 14 March 2011, also meet the requirement s of Part I of this directive. Part II - Inspection of the MLG Retraction-Actuator Bracket and Related Pins For any MLG dressed shock strut with part number and serial number listed in Paragraph 1.A. Effectivity of Bombardier SB 670 BA-32-033, Revision B, dated 26 June 2012, or later revisions approved by the Chief, C ontinuing Airworthiness, Transport Canada, perform a detailed visual inspection of the re tract-actuator bracket assembly, associated pins and the mating lugs on the outer cylinder for evidence of corrosion, and rectify as applicable, in accordance with the above-mentioned SB within 4400 hours air time or 24 months, whichever occurs first, from the effe ctive date of the original issue of this A D (22 September 2011). Inspection and rectification in accordance with Bombardier SB 670BA-32-033, Revision A, dated 29 July 2011, or Initial Issue, dat ed 14 March 2011, also meet the requirements of Part II of this directive. Note: The part numbers and serial numbers of the MLG dressed shock strut has been clarified in the above-mentioned service bulletin. Operators are advised to perform a records check to ensure all required actions have been completed. Part III - Replacement of the MLG Retraction Actuator
As of the effective date of th is directive, no person is permitted to install on an aeroplane, an MLG retraction actuator assembly with part number and serial number listed in Paragraph 1.A. Effectivity of Bombar dier SB 670BA-32-031, Revision C, dated 17 April 2012, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, unless a detailed visual ins pection of the retraction actuator assembly has been performed, for evidence of corrosion and security of jam nut, and rectification as applicable, in accordance with Part A of t he Accomplishment Instru ctions of the abovementioned SB and the repetitive inspection of Part I of this AD is subsequently followed. The inspection specified in Part I of this directive is not required for any retraction actuator assembly identified with Mod St atus “32-64” on the identification plate. Part IV - Replacement of the MLG Dressed Shock Strut
A s of the effective date of th is directive, no person is permitted to install on an aeroplane, an MLG dressed shock strut with part number and serial number listed in Paragraph 1.A. Effectivity of Bombardier SB 6470BA-32-033, Revision B, dated 26 June 2012, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada, unless the inspection, and rectification as applicable, spec ified in Part II of this directive has been completed.
Part V - Installation of the New Jam Nut For any MLG retraction actuator assembly with part number and serial number listed in Paragraph 1.A. Effectivity of Bombardier SB 670BA-32-031, Revision C, dated 17 April 2012, or later revisions approved by the Ch ief, Continuing Airworthiness, Transport Canada, install the new jam nut part number 49606-5 in accordance with Part B of the Accomplishment Instructions of the above-mentioned SB within 20 000 hours air time or 10 years, whichever occurs first, fr om the effective date of this AD.No. N ° CF-2011-36R1 3/3

For any retraction actuator assembly i dentified with Mod Status “32-64” on the identification plate, the requirement s of Part V of this AD is met. The inspection specified in Part I of this AD is not required for retraction actuator assembly with Part V of this AD incorporated.
Authorization: For the Minister of Transport, Infrastructure and Communities, 

### ORIGINAL SIGNED BY David Turnbull Director, National Aircraft Certification
Contact: Helen Tsai, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail ADs@tc.gc.ca or any Transport Canada Centre.