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 name. 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 by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357. 

URGENT URGENT URGENT URGENT URGENT URGENT URGENT URGENT URGENT

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 Communications 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 

24-0022 (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 Textron 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 identifiable except by inspection. A disconnect of the 

affected components may lead to loss of control of the helicopter. 

This directive mandates inspections and rectification of the nut, shaft and clevis assembly 

for all affected components. 

Corrective 

Actions: 

A. Upon receipt of this directive and prior to next flight, identify the applicable Bell Alert 

Service Bulletin (ASB) listed below and determine 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 2011 
No.

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 instructions 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 above-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 Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.