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NUMERICAL INDEX OF SERVICE INFORMATION LETTERS
S.I.L. No.  Rev. No.  Originator  Date Issued  Expiry Date  Subject  Engine Model Applicability 
PT6A-078  - V. Mastrocola  Sep 02/1999  Sep 02/2000  Replacement of  PT6A-38/-40/ 
EXPIRED  First-stage Sun Gear and Planet Gears at Overhaul  -41/-41AG/-42/ -42A/-62 Engines 
PT6A-079  - V. Mastrocola  Sep 02/1999  Sep 02/2000  First-stage Sun Gear  All PT6A 
EXPIRED  and Planet Gears Set Replacement at Overhaul  Engine Models Except PT6A-38/-40/ -41/-41AG/ -42/-42A/-62 Engines 
PT6A-080 EXPIRED  - V. Mastrocola  Sep 23/1999  Sep 23/2000  RGB Rear Case Corrosion  All PT6A Engines 
PT6A-081  - V. Mastrocola  Sep 23/1999  Sep 23/2000  SB 13334/SB 14293  PT6A-62, 
EXPIRED  Replacement of the Exhaust Duct Fitting by a Plug  PT6A-64, PT6A-67B Engines 
PT6A-082  - V. Mastrocola  Sep 23/1999  Sep 23/2000  Exhaust Duct Drainage  PT6A-38/-41/ 
EXPIRED  -/41AG/-42/ -45A/-45R PT6A-60A/-61/ -62/-65AG/ -65AR/-65B/ -65R PT6A-64-42A/ -60AG/-67B/ -67D/-68 Engines 
PT6A-083  - V. Mastrocola  Nov 17/1999  Nov 17/2000  Compressor Turbine  PT6A-41, 
EXPIRED  (CT) Blades P/N 3123131-01  PT6A-42, PT6A-45A, PT6A-45B, PT6A-45R, PT6A-50 Engines 
PT6A-084  5  M. McWilliams  Jan 01/2006  Extended Engine Service Policy (EESP)  PT6A-45R, PT6A-50, PT6A-65B, PT6A-65R, PT6A-65AR, PT6A-67D, PT6A-67R Engines 
PT6A-085 EXPIRED  - M. Sep  Mar 03/2000  Mar 03/2001  Fuel Pumps  PT6A-114/ -114A 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-086  - M. Sep  Mar 09/2000  Mar 09/2001  PT6A T5 Trim Upgrade  PT6A-41, 
EXPIRED  -New T5 Trim  PT6A-42, 
3053995; Old T5 Trim  PT6A-42A, 
3034857  PT6A-45A, PT6A-45B, PT6A-45R, PT6A-50, PT6A-60A, PT6A-60AG, PT6A-61, PT6A-62, PT6A-64, PT6A-65AG, PT6A-65AR, PT6A-65B, PT6A-65R, PT6A-66, PT6A-66A, PT6A-67, PT6A-67A, PT6A-67AF, PT6A-67AG, PT6A-67B, PT6A-67D, PT6A-67R, PT6A-67T, PT6A-68, PT6A-68A Engines 
PT6A-087  Never Issued 
PT6A-088  Never Issued 
PT6A-089  Never Issued 
PT6A-090  Never Issued 
PT6A-091  - M. Sep  Jun 15/2000  Jun 15/2001  One Time Inspection  PT6A-64, 
EXPIRED  Requirement for the Fuel Control Unit (Woodward Models with Manual Over-ride Lever for Single Engine Aircraft)  PT6A-65AG, PT6A-65B, PT6A-67AG, PT6A-67B Engines 
　
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