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BULLETIN INDEX LOCATOR
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF
MODEL APPLICATION PT6A-64, PT6A-66, PT6A-66A, PT6A-66B, PT6A-66D, PT6A-66T , PT6A-67, PT6A-67A, PT6A-67AF , PT6A-67AG, PT6A-67B, PT6A-67D, PT6A-67F , PT6A-67P , PT6A-67R, PT6A-67RM, PT6A-67T Commercial Support Program No: 1009369 Compliance: CATEGORY 1 Summary: Second-stage Power Turbine (PT) Blades manufactured from specific raw material may be at higher risk of low time fracture. Replace the Second-stage PT Blades with same part number manufactured from different raw material.
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 Feb 13/2024 PT6A-72-A14574 Cover Sheet
24-Hour Global Service USA & CANADA........................ 1-800-268-8000 Other1-450-647-8000
CFIRST CENTRE International .................... (IAC*)+8000-268-8000 Fax1-450-647-2888
Toll free where available (SIL GEN-027) * International Access Code Web Site .................................. www.pwc.ca Export Classification: This document contains no technical data
WARNING - PROPRIETARY RIGHTS & EXPORT CONTROLS NOTICE This bulletin contains proprietary information of Pratt & Whitney Canada Corp. ( ″P&WC″), which P&WC provides in confidence and solely for the purposes of supporting engine certification 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 any information in it may be disclosed to others, or used for any other purpose, including, without limitation, to design, create, develop, reproduce, manufacture or derive any design, part, product, material, process, modification, configuration change or repair, or obtain FAA or other government approval to do so. Possession and use of this bulletin is also subject to the restrictions set out in P&WC’s T echnical Data Agreement (a copy of which may be obtained by contacting P&WC T echnical Publications). The contents of this bulletin may be subject to export control laws. Unauthorized export 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.
If a Government agency or department intends to disclose any information, written notice should be given to:
VP - Legal Services, Pratt & Whitney Canada Corp., 1000 Marie-Victorin (01BE5), Longueuil, Quebec J4G 1A1.
Export Classification: This document contains no technical data
1. Planning Information A. Effectivity All PT6A-64, PT6A-66, PT6A-66A, PT6A-66B, PT6A-66D, PT6A-66T , PT6A-67, PT6A-67A, PT6A-67AF , PT6A-67AG, PT6A-67B, PT6A-67D, PT6A-67F , PT6A-67P , PT6A-67R, PT6A-67RM, PT6A-67T engines.
B. Concurrent Requirements None.
C. Reason
(1) Problem Second-stage PT Blades manufactured from specific raw material may be at higher risk of low time fracture.
(2) Cause The raw material used during manufacturing is considered suspect.
(3) Solution Replace the Second-stage PT Blade(s) with same part number manufactured with different raw material.
D. Description Do an inspection of the applicable engine records necessary to determine if any of its Second-stage PT Blade serial numbers are found in the list of suspect serial numbers in table 1. Replace any suspect Second-stage PT Blade(s) with one(s) not listed in table
1.
E. Compliance For engines with less than 50 Flight Hours Total Time Since New (TTSN) or total time since shop visit or total time since Second-stage Power Turbine repair:
CATEGORY 1 - P&WC recommends to do this service bulletin before the next flight.
F . Approval The technical content of this document is approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization No: DAO #93-Q-01.
G. Manpower No more man-hours are necessary to include this service bulletin at overhaul.
P&WC No. RFN7101
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 P&WC Proprietary Information. Subject to the restrictions on the back of the locatorFeb 13/2024 PT6A-72-A14574 Page 1 of 5© 2024 Pratt & Whitney Canada Corp.
PRINTED IN CANADA
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF Export Classification: This document contains no technical data
1. Planning Information (Cont’d) H. Weight and Balance None.
I. Electrical Load Data Not applicable.
J. Software Accomplishment Summary Not applicable.
K. References Illustrated Parts Catalog P/N 3038323 (PT6A-64) Illustrated Parts Catalog P/N 3058084 (PT6A-66A) Illustrated Parts Catalog P/N 3036124 (PT6A-66/66B) Illustrated Parts Catalog P/N 3070904 (PT6A-66D) Illustrated Parts Catalog P/N 3134824 (PT6A-66T) Illustrated Parts Catalog P/N 3036134 (PT6A-67/67A/67AF/67AG/67R/67T) Illustrated Parts Catalog P/N 3038338 (PT6A-67B/67P) Illustrated Parts Catalog P/N 3072154 (PT6A-67D) Illustrated Parts Catalog P/N 3071154 (PT6A-67F) Overhaul Manual P/N 3038322 (PT6A-64) Overhaul Manual P/N 3058083 (PT6A-66A) Overhaul Manual P/N 3036123 (PT6A-66/66B) Overhaul Manual P/N 3070903 (PT6A-66D) Overhaul Manual P/N 3134823 (PT6A-66T) Overhaul Manual P/N 3036133 (PT6A-67/67A/67AF/67AG/67R/67T) Overhaul Manual P/N 3038337 (PT6A-67B/67D/67P)
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 P&WC Proprietary Information. Subject to the restrictions on the back of the locatorFeb 13/2024 PT6A-72-A14574 Page 2 of 5
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF Export Classification: This document contains no technical data
1. Planning Information (Cont’d) Overhaul Manual P/N 3071153 (PT6A-67F) L. Publications Affected None.
M. Interchangeability and Intermixability of Parts Interchangeability - Refer to Para. 2.C.
Intermixability - Not changed.
2. Material Information A. Industry Support Information Refer to Commercial Support Program Notification (CSPN) 1009369.
B. Material - Price and Availability You can get the procurable parts listed in Para. 2.C. from any Pratt & Whitney Canada Parts Distribution Center.
The estimated total cost of new parts needed to replace old parts is $Quote (US, 2024.
The new parts are available.
C. Material Necessary for Each Engine The quantity of materials listed in this section is on a per engine basis.
New P/N Keyword Old P/N Qty Est. Unit List Price ($US, 2024 Instructions Dispositions 3056693-01 Blade, Power Turbine 3056693-01 AR 4001.30 (A) (A) Discard.
D. Reidentified Parts None.
E. T ooling - Price and Availability Not Applicable
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 P&WC Proprietary Information. Subject to the restrictions on the back of the locatorFeb 13/2024 PT6A-72-A14574 Page 3 of 5
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF Export Classification: This document contains no technical data
3. Accomplishment Instructions A. Do an inspection of the applicable engine records necessary to determine if any of its Second-stage PT Blade serial numbers are found in the list of suspect serial numbers in table 1.
(1) If none are found, go to Para 3.D.
(2) If any are found go to the next step.
B. Remove the Second-stage PT Blade(s) identified in table 1 as follows:
Ref. OHM 72-50-04.
C. Install Second-stage PT Blade(s) with one(s) not listed in table 1, in accordance with the overhaul manual instructions as follows:
Ref. OHM 72-50-04.
D. Write the accomplishment of P&WC S.B. No. 14574 in the engine module log book.
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 P&WC Proprietary Information. Subject to the restrictions on the back of the locatorFeb 13/2024 PT6A-72-A14574 Page 4 of 5
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF Export Classification: This document contains no technical data
3. Accomplishment Instructions (Cont’d)
4. Appendix Refer to T able 1 for the suspect Second-stage PT Blade Serial Numbers.
TABLE 1, Suspect Second-stage PT Blade Serial Numbers Serial Number Range Serial Number Range Serial Number Range Serial Number Range TH16F839 to TH16F999 TH17F000 to TH17F021 TH19F815 to TH19F999 TH20F000 to TH20F011 TH41F965 to TH41F999 TH42F000 to TH42F169 TH45F128 to THF45F704 TH46F013 to TH46F393 TH47F097 to TH47F286 TH47F411 to TH47F766 TH49F708 to TH49F853 TH50F440 to TH50F729 TH51F020 to TH51F195 TH51F208 to TH51F346 TH51F449 to TH51F617 TH52F577 to TH52F758 TH54F987 to TH54F999 TH55F000 to TH55F186 TH56F714 to TH56F838 TH56F955 to TH56F999 TH57F000 to TH57F127 TH57F388 to TH57F558 TH57F603 to TH57F779 TH57F791 to TH57F974 TH58F230 to TH58F426 TH58F803 to TH58F929 TH58F977 to TH58F999 TH59F000 to TH59F141 TH59F219 to TH59F395 TH61F292 to TH61F489 TH65F152 to TH65F326 TH70F250 to TH70F408
PRATT & WHITNEY CANADA
ALERT SERVICE BULLETIN P&WC S.B. No. A14574 P&WC Proprietary Information. Subject to the restrictions on the back of the locatorFeb 13/2024 PT6A-72-A14574 Page 5 of 5
TURBOPROP ENGINE
SECOND-STAGE POWER-TURBINE BLADES - INSPECTION/REPLACEMENT OF Export Classification: This document contains no technical data