PRATT & WHITNEY CANADA
NUMERICAL INDEX OF SERVICE INFORMATION LETTERS
S.I.L. No.  Rev. No.  Originator  Date Issued  Expiry Date  Subject  Engine Model Applicability 
PT6A-025  2  M. Letarte  Oct 06/2010  Embodiment of New CT Vanes in Lieu of Repaired/Exchanged: Warranty Consideration  PT6A-65AR, PT6A-65B, PT6A-65R, PT6A-67D, PT6A-67R Engines 
PT6A-026  - Never Issued 
PT6A-027  - V. Mastrocola  Jul 31/1996  Inspection of Front P3 Tube Assembly  All PT6A Engines 
PT6A-028  - L. M. Trottier  Jul 16/1996  Stolen Parts Superceded by Gen-031  PT6A Engines 
PT6A-029  - V. Mastrocola  Apr 29/1997  Apr 29/1998  Soft Time Replacement  PT6A-65B/ 
EXPIRED  Recommendation for  -65R/-65AR/ 
First Stage Power Turbine (PT) Blades  -65AG Engines 
PT6A-030  2  A. Chevalier  Jun 13/2001  ″No Charge Exchange″ Coverage for Accessories  PT6A-34, PT6A-64, PT6A-21, PT6A-42, PT6A-42A, PT6A-60A, PT6A-65B, PT6A-67A, PT6A-67B, PT6A-135, PT6A-66, PT6A-65B, PT6A-67D Engines 
PT6A-031  - V. Mastrocola  Nov 27/1996  Nov 27/1997  SB1538/SB3344/  All PT6A 
EXPIRED  SB4204/ SB12134/SB13287/ SB14251 One Time Inspection of Compressor Bleed Valve  Engines 
PT6A-032  1  L. Bourque  Jan 07/2004  Re-classi.cation of Small PT6A Vanes  All PT6A Engines 
PT6A-033 EXPIRED  - V. Mastrocola  Jan 14/1997  Jan 14/1998  Commercial Support Program for Improved Oil Filler Tube  PT6A-11AG/ -15AG/-34AG Engines 
PT6A-034  6  G. Mulas  Jan 30/2009  Engines -Discolored Oil  PT6A-67B Engines 

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PT6A SIL’s
PRATT & WHITNEY CANADA
NUMERICAL INDEX OF SERVICE INFORMATION LETTERS
S.I.L. No.  Rev. No.  Originator  Date Issued  Expiry Date  Subject  Engine Model Applicability 
PT6A-035  - V. Mastrocola  Feb 19/1997  Feb 19/1998  Propeller Governor - PT6A-10, -11, 
EXPIRED  Eccentric Cover Screw Replacement  -11AG, -15AG, -20A, -20B, -21, -25, -25A, -25C, -27, -28, -34, -34AG, -34B, -36, -38, -41, -41AG, -42, -45A, -45B, -45R, -60A, -61, -64, -65AG, -65AR, -67B, -65R, -67B, -110, -112, -114, -114A, -116, -135, -135A Engines 
PT6A-036 EXPIRED  - M. Dermarkar  Feb 24/1997  Feb 24/1998  Revision of Agtoil 23 and Agtoil 24  All PT6A Engines 
PT6A-037 EXPIRED  1  V. Mastrocola  Aug 12/1998  Aug 12/1999  Conversion of Hours to Cycles  All PT6A Engines 
PT6A-038  - V. Mastrocola  Apr 09/1997  Apr 09/1998  Revised P3 Tube and  PT6A-11/ 
EXPIRED  P3 Filter Drain  -11AG/ -15AG/ -25/-25A/ -25C/-27/ -28/-34/-34B /-34AG/-36/ -110/-112/ -114/-114A/ -135/-135A Engines 
　
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