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) 593 . 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 aircr aft. 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 Divisi on (AARDG), National Aircraft Cer tification Branch, Transport Can ada, Ottawa, telephone 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 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) 

### 1/1 No

. CF-2007-13R2

Issue Date 10 November 2009

Number: CF- 2007-13R2 Subject: Power Turbine RPM Steady State Operation Avoidance

Effective: 9 December 2009

Revision: Supersedes Airworthiness Directive (AD) CF-2007-13R1 dated 13 May 2008
Applicability: Bell Helicopter Textron Canada (BHTC) Model 206B series helicopters including those converted from model 206A, serial num bers up to 4675, and 206L helicopters serial numbers 45001 through 45153 and 46601 through 46617. Compliance: As indicated, unless already accomplished.
Background: Transport Canada has been advised of several third stage turbine wheel failures used in Rolls Royce 250-C20 engines. Rolls Royce has determined that detrimental vibrations can occur within a particular range of turb ine speeds, which are a potential contributing factor to these failures. BHTC has revised the rotorcraft flight manuals and provided a decal to inform pilots to avoid steady st ate operations at these engine turbine speeds. This revision mandates a new Flight Manual Amendment and installation of a new decal.

Corrective Actions: Part A: Rotorcraft Flight Manual Amendment

1. Within 10 calendar days after the effective date of this directive, update the applicable Flight Manuals by inserting appropriate f light manual revisions dated 8 December 2008: Model 206B, Revision B-50 Model 206B3, Revision 11 Model 206L, Revision 28

2. Advise the pilots of this change.

Part B: Installation of Decal In conjunction with Pa rt A above, install the decal as per Alert Service Bulletin (ASB) 206-07-115 Revision C, dated 4 February 2009 or 206L-07-146 Revision B, dated 03 March 2009, as applicable, or later revisions approved by Chief, Continuing Airworthiness, Transport Canada.

Authorization: For Minister of Transport, Infrastructure and Communities

Derek Ferguson Chief, Continuing Airworthiness

Contact: Mr. Bogdan Gajewski, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail CAW WEB Feedback@tc.gc.ca or any Transport Canada Centre.