# Transport Transports

Canada Canada T P 7245E



# AIRWORTHINESS DIRECTIVE

T he f o l l o w i ng ai r w or thi ness di r e cti v e ( A D ) may be appl i c abl e to an ai r c r a f t w h i c h our r e cor d s i ndi cate i s r e g i ster ed i n y our na me. AD s ar e i suant to Canadian Aviation Regulation (CA R ) 5 9 3 . Pur s uant to C A R 605.84 and the f u r t her detai l s of C A R St andard 625, A ppendix H , the conti nui ng ai r w or thi a C anadi an r e g i ster ed ai r c r a f t i s conti n g ent upon compl i ance w i th al l appl i c abl e AD s. Fai l u r e to compl y w i th the r e q u i r ements of an AD may i n v a l i dat e the f l i g ht author i z ati the ai r c r a f t. Al ter nati v e means of compl i ance shal l be appl i ed f o r i n accor dance w i th C A R 605.84 and the abov e- r e f e r enced Standard

. T h i s AD has been i ssued by the C onti nui ng Ai r w or thi ness D i v i si on ( AAR D G )

, Ai r c r a f t C e r t i f i c ati on Br anch, T r anspor t C anada, Otta w a , tel ephone 613 952- 4357. ssued pur ness of

on of

Pur s uant to C A R 202.51 the r e g i ster ed ow ner of a C anadi an ai r c r a f t shal l

, w i thi n sev en day s, noti f y the M i ni ster i n w r i t i n g of any chang e of hi s or her name or addr ess.

T o r e q uest a chang e of addr ess, contact the Civ il A v iat i on Communicat ions Centre (A A RC)
at Place de Ville, Ot t a w a , Ont a rio K1A 0N8 , or 1- 800- 305- 2059

, or www. t c

. g c

. c a / c i v i l a v i a t i o n / c o m m u n i c a t i o n s / c e n t r e / a d d r ess.asp

24- 0022 ( 01- 2005) 

# 1/2 No



## . 

# CF-2007-24R1

Issue Date 

# 21 December 2007

Num b er: CF-2007-24R1

Subject: PW 200 Compressor Turbine Disk Inspection and Retaining Nut Replacement

Effectiv e: 10 January 2008

Rev i sion: Supersedes Airworthiness Directiv e (AD) CF-2007-24 dated 25 October 2007

A pplicability : PW206A Serial No. PCE-BA0031 and earlier

PW206B Serial No. PCE-BB00126 and earlier

PW206B2 Serial No. PCE-BJ0369 and earlier
PW206C Serial No. PCE-BC0605 and earlier

PW206E Serial No. PCE-BE0048 and earlier
PW207C Serial No. PCE-BH0054 and earlier

PW207D Serial No. PCE-BF0135 and earlier

PW207E Serial No. PCE-BG0106 and earlier

PW207K Serial No. PCE-BK0032 and earlier

C o mpliance: As indicated below in “Corrective Actions ” in the “, unless already accomplished.

Background: PW206 and PW207 Compressor Turbine (CT) Disk bore areas may experience impact damage resulting from bending or fracture of the CT Disk Retaining Nut. Damage of the CT disk bore area can reduce LCF capabilities of the CT disk, resulting in disk fracture.

To preclude any potentially hazardous sit uation precipitated by a damaged CT disc,

P&WC issued Alert Service bulletin PW200-72- A 28280, requiring inspection of the CT disc bore area for damage and replacement of the existing Disk Retaining Nut with an improved designed part.

The most recent compliance data indicates that the majority of the affected engines, particularly those with high in-service ti me, still have not been inspected to service bulletin (SB) PW200-72- A 28280 requirements and as such, are potentially susceptible to CT disc damage. This AD is issued to mandat e the inspection of the CT disc bore area and replacement of the existing Disk Retaining Nut, in accordance with
SB PW200-72-A28280 R4 instructions.

### No.

N ° 

# CF-2007-24R1 2/2

Corrective

Actions: On all affected engines specified in the applicab ility section of this directive, accomplish the following:

1. For Engines that have never had a shop visit and have accumulated 4000 CT cycles or more since new, or

For Engines that have accumulated 2700 co mpressor turbine (CT) cycles or more

since:

a) 

# last shop visit; or

b) 

# last CT disc inspection; or c) incorporation of SB. PW200-72- 28287.

Within 1150 hrs of engine operating time si nce 28 April 2006 (original issue date of SB PW200-72-A28280), but not later than Marc h 21, 2008, whichever occurs first

, accomplish the following in accordance with P&WC SB PW200-72-A28280 R4 or later revisions approved by the Chief, Continuing Airworthiness, Aircraft Certification, Transport Canada:

A. Inspect the CT disk bore area for damage and if any damage is noticed, replace the CT disc before next flight.

B. Replace the existing CT disc retaining nut and associated hardware.

2. For engines that have never had a s hop visit and have accumulated less than 4000 CT cycles since new, before the engine r eaches 4000 CT cycles or not later than March 21, 2008, whichever occurs later, accomplish the corrective actions in paragraphs 1.A. and 1.B. above in acco rdance with P&WC SB PW200-72-A28280 R4 or later revisions approved by the Chie f, Continuing Airworthiness, Aircraft Certification, Transport Canada.

3. For engines that have accumulat ed less than 2700 CT cycles since:

a) last shop visit; or b) last CT disc inspection; or c) incorporation of P&WC SB pw200-72-28287.

Before the engine reaches 2700 CT cycles or not later than March 21, 2008, whichever occurs later, accomplish the correction ac tions in paragraphs 1.A. and 1.B. above in accordance with P&WC SB PW200-72-A28280 R4 or later revisions approved by the Chief, Continuing Airworthiness, Airc raft Certification, Transport Canada.

Note : Compliance with earlier versions of SB PW200-72- A 28280 requirements prior

to the effective date of this dire ctive satisfies the corrective action requirements of this directive.

Authorization: For Minister of Transport, In frastructure and Communities

Bohdan Goyaniuk Chief, Continuing Airworthiness

Contact: Mr. Robin Lau, Continuing Airworthiness, Ottawa, telephone (613) 952-4461, facsimile (613) 996-9178 or e-mail laur@tc.gc.ca or any Transport Canada Centre.