ALERT SERVICE BULLETIN
NO. 427-06-13
AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT
IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER
PRATT & WHITNEY CANADA
SERVICE BULLETIN
P&WC S.B. No. 28280
BULLETIN INDEX LOCATOR
72-51-01
TURBOSHAFT ENGINE
COMPRESSOR DISC INSPECTION OF AND RETAINING NUT REPLACEMENT
MODEL APPLICATION
PW206A, PW206B, PW206B2, PW206C, PW206E, PW207C, PW207D, PW207E, PW207K
Compliance: CATEGORY 3
Summary: There is a possibility that under high centrifugal load, the castellations of the Compressor Turbine (CT) disc retaining nut bend outward then contact and mark the CT disc internal bore. Replace the CT disc retaining castellation nut with a redesigned one that is more resistant to high centrifugal load. Also, the introduction of the new nut necessitates the replacement of the key washer and the retaining ring locking device used at this location. A one-time inspection of the CT disc internal bore is also performed.
Apr 28/2006 PW200-72-28280
Cover Sheet
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WARNING -PROPRIETARY RIGHTS & EXPORT CONTROLS NOTICE
This bulletin contains proprietary information of Pratt & Whitney Canada Corp. (″P&WC″), which
P&WC provides in con.dence and solely for the purposes of supporting engine certi.cation and
providing applicable information regarding the proper use, maintenance, inspection, repair, servicing
and parts application of P&WC products and services, as directed therein. Neither this bulletin nor
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limitation, to design, create, develop, reproduce, manufacture or derive any design, part, product,
material, process, modi.cation, con.guration change or repair, or obtain FAA or other government
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or re-export of the bulletin, or parts thereof, is prohibited. By accepting and possessing this bulletin,
you agree to be bound by the foregoing terms.
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