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.

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-2013-02

Issue Date 

 22 January 2013 

Number: CF-2013-02 

Subject: First Stage Power Turbine Blade Failure 

Effective: 31 January 2013 

Applicability: Pratt & Whitney Canada (P&WC) engine models: 

PW118A, PW118B, PW119B, PW119C, PW123, PW123B, PW123C, PW123D 

PW123E, PW123AF, PW124B, PW125B, PW126, PW126A, PW127, PW127B, 

PW127D, PW127E, PW127F, PW127G, PW127H, PW127J and PW127M. 

Compliance: As indicated below, unless already accomplished. 

Background: There have been various reported incidents of P&WC PW100 series engine failures

caused by the fracturing of the 1st Stage Power turbine (PT1) blade. Some of the above

cases have resulted in engine fires. Further investigation by P&WC has traced the 

affected PT1 blade failures to undetected shrinkage porosity of unacceptable levels 

within the blade casting. Service experience indicates that the blades manufactured 

between 2005 and 2008 exhibit a higher propensity for unacceptable levels of shrinkage 

porosity. 

To address the problem of unacceptable shrinkage porosity in the blade castings, in

April 2008 P&WC introduced improved X-ray inspection methodology, which has shown

to be twice as effective in detecting the subject discrepancy in the blades as compared to 

the pre 2008 inspection method. In order to help purge the suspect 2005 to April 2008 

production batch blades from service, P&WC has issued service bulletin (SB) 21823 

requiring a onetime inspection of all affected 2005 to April 2008 production blades, using 

the post 2008 improved X-ray inspection methodology. 

To mitigate the problem of in-flight engine failures and a possible safety hazard of engine 

fires, as result of PT1 blade fractures, this AD is issued to mandate compliance with 

P&WC SB 21823R2 to inspect the affected batch of blades and remove potentially 

discrepant PT1 blades from in service engines. 

Corrective 

Actions: 

Within 60 months from the effective date of this AD or any time when the affected engine

with PT blades that are listed in the Table 1 of P&WC SB 21823 R2 dated 15 Nov 2012 is 

disassembled and access is available to the necessary subassembly, whichever occurs 

first, perform a onetime inspection of the affected PT1 blades, in accordance with 

P&WC SB 21823 R2 dated 15 Nov 2012, or later revisions approved by the Chief, 

Continuing Airworthiness, Transport Canada. 
No.

N° CF-2013-02 2/2 

PT1 blades inspected in compliance with earlier versions of SB 21823 prior to the 

effective date of this AD, meet the intent of this AD. 

Authorization: For the Minister of Transport, Infrastructure and Communities, 

ORIGINAL SIGNED BY

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: A.K Durrani, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

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