September 8, Cessna Distributors, Authorized Service Facilities, CPC's, CSTARS, ASR's, and affected Owners of Record

Transcription

1 Service Newsletter September 8, 2011 SNL11-23 TITLE P&WC PROPELLER-SHAFT OIL SEAL MODIFICATION TO Cessna Distributors, Authorized Service Facilities, CPC's, CSTARS, ASR's, and affected Owners of Record MODELS AFFECTED All model 208/208B airplanes DISCUSSION The purpose of this service newsletter is to transmit Pratt & Whitney Canada (P&WC) S.B. No. 1670, Turboprop Engine Propeller-Shaft Oil Seal Retaining-Ring-Halves - Replacement/Modification Of. To reduce oil leakage at the propeller shaft seal area, introduces new top and bottom half rings with shorter felt strip protrusion, modified felt strip layer orientation, and defined length. P&WC asks that you comply with during overhaul or maintenance and when the supply of superseded parts is fully used. OWNER NOTIFICATION On September 8, 2011 a copy of this service newsletter will be sent to applicable owners of record. As a convenience, service documents are now available online to all our customers through a simple, free-of-charge registration process. If you would like to sign up, please visit the Customer Access link to register. * * * * * * * Page 1 of 1 To obtain satisfactory results, procedures specified in this publication must be accomplished in accordance with accepted methods and prevailing government regulations. Cessna Aircraft Company cannot be responsible for the quality of work performed in accomplishing the requirements of this publication. Cessna Aircraft Company, Customer Service, P.O. Box 7706, Wichita, Kansas 67277, U.S.A. (316) , Facsimile (316) COPYRIGHT 2011

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3 BULLETIN INDEX LOCATOR , MODEL APPLICATION PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34AG, PT6A-34B, PT6A-35, PT6A-36, PT6A-114, PT6A-114A, PT6A-135, PT6A-135A Compliance: CATEGORY 7 PRATT & WHITNEY CANADA Summary: Oil leakage can occur at the propeller shaft seal area. To improve sealing, introduce new top and bottom half rings that have shorter felt strip protrusion, modified felt strip layer orientation and defined length. Cover Sheet 24-Hour Global Service USA & CANADA Other CFIRST CENTRE International... (IAC*) Fax Toll free where available (SIL GEN-027) * International Access Code Web Site...

4 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 Technical Data Agreement (a copy of which may be obtained by contacting P&WC Technical 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.

5 1. Planning Information A. Effectivity PT6A-6 Engines. PT6A-6A Engines. PT6A-6B Engines and all engines converted to Engine Model PT6A-6B (Ref. P&WC engine conversion SB1065). PT6A-20 Engines and all engines converted to Engine Model PT6A-20 (Ref. P&WC engine conversion SB1267). PT6A-20A Engines and all engines converted to Engine Model PT6A-20A (Ref. P&WC engine conversion SB1268). PT6A-20B Engines and all engines converted to Engine Model PT6A-20B (Ref. P&WC engine conversion SB1206). PT6A-21 Engines which are before and include Serial No. PCE-PE0690 and PCE thru PCE PT6A-25 Engines which include Serial No. PCE thru PCE and PCE thru PCE PT6A-25A Engines which are before and include Serial No. PCE-RN0003 and Serial No. PCE PT6A-25C Engines which are before and include Serial No. PCE-PF0069 and PCE thru PCE PT6A-27 Engines. PT6A-28 Engines which include Serial No. PCE thru PCE and all engines converted to Engine Model PT6A-28 (Ref. P&WC engine conversion SB1120). PT6A-34 Engines. PT6A-34AG Engines. PT6A-34B Engines which include Serial No. PCE thru PCE PT6A-35 Engines. PT6A-36 Engines which include Serial No. PCE thru PCE and all engines converted to Engine Model PT6A-36 (Ref. P&WC engine conversion SB1405). PT6A-114 Engines. PT6A-114A Engines. PT6A-135 Engines. PT6A-135A Engines. B. Concurrent Requirements None. C. Reason (1) Problem Oil leakage can occur at the propeller shaft seal area. (2) Cause The definition and the length of the felt strip are not optimal. P&WC No. E3030B, E3030D 2011 Pratt & Whitney Canada Corp. PRINTED IN CANADA Page1of9

6 1. Planning Information (Cont d) (3) Solution D. Description To improve sealing, introduce new top and bottom half rings that have shorter felt strip protrusion, modified felt strip layer orientation and defined length. Remove propeller-shaft oil seal retaining-ring-halves and replace with new or modified ones. E. Compliance CATEGORY 7 - You can do this service bulletin when the supply of superseded parts is fully used. F. Approval D.O.T./D.A.A. approved. G. Manpower No more man-hours are necessary to include this service bulletin at overhaul. Once you have access to the part, an estimate of 1.0 man-hours is required to include this service bulletin at maintenance. H. Weight and Balance None. I. Electrical Load Data Not changed. J. Software Accomplishment Summary Not applicable. K. References Illustrated Parts Catalog P/N (PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B) Illustrated Parts Catalog P/N (PT6A-21, PT6A-27, PT6A-28) Illustrated Parts Catalog P/N (PT6A-25, PT6A-25A) Illustrated Parts Catalog P/N (PT6A-25C) Page2of9

7 1. Planning Information (Cont d) Illustrated Parts Catalog P/N (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36) Illustrated Parts Catalog P/N (PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) Illustrated Parts Catalog P/N (PT6A-35) Maintenance Manual P/N (PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B) Maintenance Manual P/N (PT6A-21, PT6A-27, PT6A-28) Maintenance Manual P/N (PT6A-25, PT6A-25A) Maintenance Manual P/N (PT6A-25C) Maintenance Manual P/N (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36) Maintenance Manual P/N (PT6A-35) Maintenance Manual P/N (PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) Overhaul Manual P/N (PT6A-6, PT6A-6A, PT6A-6B) Overhaul Manual P/N (PT6A-20, PT6A-20A, PT6A-20B) Overhaul Manual P/N (PT6A-21, PT6A-27, PT6A-28) Overhaul Manual P/N (PT6A-25, PT6A-25A) Overhaul Manual P/N (PT6A-25C) Overhaul Manual P/N (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-35, PT6A-36, PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) P&WC Consumable Materials List P/N PWA Overhaul Standard Practices Manual P/N L. Publications Affected Illustrated Parts Catalog P/N (PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B) Illustrated Parts Catalog P/N (PT6A-21, PT6A-27, PT6A-28) Illustrated Parts Catalog P/N (PT6A-25, PT6A-25A) Illustrated Parts Catalog P/N (PT6A-25C) Illustrated Parts Catalog P/N (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-36) Illustrated Parts Catalog P/N (PT6A-35) Illustrated Parts Catalog P/N (PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) Overhaul Manual P/N (PT6A-6, PT6A-6A, PT6A-6B) Overhaul Manual P/N (PT6A-20, PT6A-20A, PT6A-20B) Overhaul Manual P/N (PT6A-21, PT6A-27, PT6A-28) Overhaul Manual P/N (PT6A-25, PT6A-25A) Overhaul Manual P/N (PT6A-25C) Overhaul Manual P/N (PT6A-34, PT6A-34AG, PT6A-34B, PT6A-35, PT6A-36, PT6A-114, PT6A-114A, PT6A-135, PT6A-135A) M. Interchangeability and Intermixability of Parts Interchangeability - Refer to Para. 2.C. Intermixability - Not changed. Page3of9

8 2. Material Information A. Industry Support Information Not applicable. B. Material - Cost 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 $Quote (US, 2011). The new parts are available. C. Material Necessary for Each Engine The quantity of materials listed in this section is on a per Engine basis. New P/N Keyword Old P/N Qty Est. Unit List Price ($US, 2011) Instructions Disposition For PT6A-6, PT6A-6A, PT6A-6B, PT6A-20, PT6A-20A, PT6A-20B, PT6A-21, PT6A-25, PT6A-25A, PT6A-25C, PT6A-27, PT6A-28, PT6A-34, PT6A-34AG, PT6A-34B, PT6A-35, PT6A-36, PT6A-114, PT6A-114A, PT6A-135, PT6A-135A Engines: Ring Half, Top, Prop Shaft (A)(B) Osl, Retaining, Assembly Ring Half, Bottom, Prop Shaft Osl, Retaining, Assembly Quote (A)(B) For PT6A-27 Engines (BS954): Ring Half, Top, Prop Shaft Osl, Retaining, Assembly (A)(B) Consumable Parts and Materials Required: Gasket, Split (C)(D) PWC Adhesive, Epoxy, Two Part (E) (A) RESTRICTED INTERCHANGEABILITY - (ATA 200 Explanation Code 07): All parts are interchangeable as a complete set. (B) To get the new part it is possible to make a modification to the old part, or you can get the new part from any Pratt & Whitney Canada Distribution Center. Page4of9

9 Est. Unit List Price New P/N Keyword Old P/N Qty ($US, 2011) Instructions Disposition (C) Standard replacement part. (D) Parts are the latest at the time of issue of this SB (E) Ref. Scotchweld EC-2216B/A Gray PMC (CPW 525), Vendor Code 76381(m) D. Reidentified Parts The following list of parts can be reworked: OLD P/N NEW P/N E. Tooling - Price and Availability Not applicable. 3. Accomplishment Instructions A. Remove the parts listed under Old P/N in Para. 2.C., Material Information, in accordance with the applicable maintenance or overhaul manual instructions: v Ref. MM Part 3 LINE MAINTENANCE v Ref. MM REDUCTION GEARBOX - MAINTENANCE PRACTICES. v Ref. MM REDUCTION GEARBOX - MAINTENANCE PRACTICES (PT6A-114/A, -135/A). v Ref. OHM Part 5 REDUCTION GEARBOX FRONT HOUSING EXTERNALS. v Ref. OHM REDUCTION GEARBOX - DISASSEMBLY (PT6A-27, -28, -34, -34AG, -34B, -35, -36). v Ref. OHM REDUCTION GEARBOX - DISASSEMBLY (PT6A-21, -114, -114A, -135, -135A).. B. The top and bottom propeller-shaft oil seal retaining ring P/N and P/N can be modified as follows : (1) For engines at Overhaul: (a) Replace felt strip P/N from the top and bottom propeller-shaft oil seal retaining-ring-half assembly Page5of9

10 3. Accomplishment Instructions (Cont d) v Ref. OHM Chapter REDUCTION GEARBOX - REPAIR, Replacement of Worn or Damaged Felt Strip. v Ref. OHM Chapter REDUCTION GEARBOX - REPAIR, Replacement of Worn or Damaged Felt Strip.. (b) Install the new felt strip (Ref. Fig. 1). NOTE: Make sure that the projection of the felt strip at the two ends of the ring half is in. (0.25 mm) maximum. WARNING: USE EYE PROTECTION WHEN YOU WRITE WITH THE VIBRATION PEENING PROCEDURE. (c) Put a line across the old part number of the propeller-shaft oil seal retaining rings. Use the vibration peening procedure, to in. ( mm) deep, and write the new part number in the same general area. (d) Anodize touch up per SPOP 42. (2) For engines in the field: (a) (b) (c) Remove felt strip insert from retaining ring half by carefully scraping slot area. Clean with acetone (PWC11-012) isopropyl alcohol (PWC11-014) or ardrox leeder 1064K (PWC ) or desoclean 45 (PWC ) envirosolv 655 (PWC ). Discard remainder of felt strip. Cut the new felt strip to the length of the groove and in the specified limits (Ref. Fig. 1). NOTE: Make sure that the projection of the felt strip at the two ends of the ring half is in. (0.25 mm) maximum. Apply adhesive (PWC08-006) to the groove of the propeller-shaft oil seal retaining ring and bond felt strip to the ring half with the black side to the bottom of the ring groove and in the specified limits. (d) Put the ring halves in the oven at 150 ± 5 F for 2 hours minimum or at 200 ± 5 F for 30 minutes minimum. WARNING: USE EYE PROTECTION WHEN YOU WRITE WITH THE VIBRATION PEENING PROCEDURE. (e) Put a line across the old part number of the propeller-shaft oil seal retaining rings. Use the vibration peening procedure, to in. ( mm) deep, and write the new part number in the same general area. Page6of9

11 3. Accomplishment Instructions (Cont d) (f) Do a coating touch-up on the vibropeened area (PWC05-166). C. Install new or modified propeller-shaft oil seal retaining rings P/N and P/N in accordance with the applicable maintenance or overhaul manual instructions: v Ref. MM Part 3 LINE MAINTENANCE v Ref. MM REDUCTION GEARBOX - MAINTENANCE PRACTICES. v Ref. MM REDUCTION GEARBOX - MAINTENANCE PRACTICES (PT6A-114/A, -135/A). v Ref. OHM Part 11 PROPELLER SHAFT OIL SEAL RETAINING RING AND THRUST BEARING ARRANGEMENT. v Ref. OHM REDUCTION GEARBOX - SUB-ASSEMBLY (PT6A-27,-28, -34, -34AG, -34B, -35, -36). v Ref. OHM REDUCTION GEARBOX - SUB-ASSY (PT6A-21, -114, 114A, -135, 135A). NOTE: Make sure to apply engine oil (PWC03-001) on the felt strip of the retaining ring halves (Ref. F&C NO. 220). D. Write accomplishment of in the applicable engine module log book. 4. Appendix A. Refer to Figure 2 for the part progression of the Propeller-Shaft Oil Seal. Page7of9

12 A PRATT & WHITNEY CANADA A IN. (0.25 mm) MAX. TWO ENDS RING HALF P/N FELT STRIP P/N IN. (0.25 mm) MAX. TWO ENDS IN. (2.54 mm) MAX. B B RING HALF P/N FELT STRIP P/N SECTION A A SECTIONB B(TYPICAL) BOND BLACK SIDE THE STRIP TO THE BOTTOM THE GROOVE Post-SB1670 C Ring Halves - Modification of Figure 1 Page8of9

13 BASIC SB SB SB SB SB SB SB1652 Re designed Felt Strip CC 8 PRC SB1652 Re designed Felt Strip CC 8 PRC SB1670 Improved Sealing CC 7 PRC SB1670 Improved Sealing CC 7 PRC 07 C Propeller-Shaft Oil Seal - Part Progression Figure 2 Page9of9

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