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 ma y 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 by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Can ada, Ottawa, telephone 613 952-4357.

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### TRANSPORT CANADA EMERGENCY AIRWORTHINESS DIRECTIVE PLEASE FORWARD IMMEDIATELY TO THE PERSON RESPONSIBLE FOR THE OPERATION AND MAINTENANCE OF YOUR AIRCRAFT

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 ) 1/2 No

. CF-2011-17
Issue Date 30 June 2011

Number: CF- 2011-17

Subject: Incorrect Assembly of Hydraulic Servo Actuators

Effective: 30 June 2011

Applicability: Bell Helicopter Text ron Canada (BHTC) helicopters: Model 407, serial numbers 53000 through 53900, 53911 through 53999 and 54000 through 54070 Model 427, serial numbers 56001 through 56077, 58001 and 58002

Compliance: As indicated below.

Background: Transport Canada was advised that a quality escape by a supplier has occurred and a number of Bell Helicopter hydraulic servo actuators may have a loose nut, shaft, and clevis assembly. The loose connection is due to improper lock washer installation. This discrepancy is not traceable or identif iable except by inspection. A disconnect of the affected components may lead to loss of control of the helicopter.

This directive mandates inspections and rectific ation of the nut, shaft and clevis assembly for all affected components.

Corrective Actions: A. Upon receipt of this directive and prio r to next flight, identify the applicable Bell A lert Service Bulletin (ASB) listed below and det ermine the helicopter hydraulic servo actuator part number and serial number in accordance with the applicable accomplishment instructions in Steps 1 and 2 of the ASB listed below.

Helicopter Model Alert Service Bulletin Date

407 407-11-96 29 June 2011 427 427-11-35 29 June 2011No. N ° CF-2011-17 2/2

B. If the part number and serial number determined from paragraph A are listed in Table 1 of the above-mentioned ASB, then prior to next flight , perform inspections in accordance with the accomplishment in structions in Step 3 of the ASB.

C. If the part number and serial number determined from paragraph A are not listed in paragraph B, but are listed below, then within 25 hours air time from the effective date of this directive, but no later than 31 July 2011 , inspect in accordance with the accomplishment instructions in Step 3 of the above-mentioned ASB.

D. If the part number and serial number are not listed in paragraphs A or B of this directive, no further action is required.

E. Any spare parts with part numbers and serial numbers as identified in paragraph B or C must have completed inspections in accordance with the accomplishment instructions in Step 3 of the applicable abov e-mentioned ASB prior to installation on a helicopter. Helicopter Model Part number Serial number

407 41011300-101 (BHT 206-076-062-105) Prior to 807

41011400-101 (BHT 206-076-062-107) Prior to 2248

427 41011300-101 (BHT 206-076-062-111) Prior to 807

41011700-101 (BHT 206-076-062-109) Prior to 230

Authorization: For the Minister of Transport, Infrastructure and Communities



### ORIGINAL SIGNED BY

Derek Ferguson Chief, Continuing Airworthiness

Contact: Ms. Yosha Mendis, Continuing Airworthi ness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.