Service Bulletin No: 24-009 Ref No: 151 Modification No: INSPECTION ATA Chapter: 24 SERVICE BULLETIN

PILATUS AIRCRAFT LTD. STANS, SWITZERLAND

Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 1 of 10 ELECTRICAL POWER - GENERAL INSPECTION FOR CHAFING ON AN ELECTRICAL HARNESS IN THE ENGINE COMPARTMENT 1. Planning Information A. Effectivity PC-7 Aircraft MSN 101 thru 618. B. Concurrent Requirements None. C. Reason (1) Problem An operator has reported signs of chafing on a wiring harness attached to the engine mounting frame on the RH side of the engine compartment. If an electrical cable becomes chafed through the insulation, a short circuit could cause a fire in the engine compartment. (2) Cause The RH flexible duct for the condenser unit can chafe against the wiring harness. (3) Solution Do an inspection of the wiring harness, and the flexible duct, for damage. If major damage is found, replace parts as necessary. If minor chafing damage is found, install a protective sleeve on the wiring harness. D. Description This Service Bulletin gives the data and instruct ions necessary to examine the wiring harness and flexible duct for chafing, and replace or repair as necessary. E. Compliance Mandatory. Accomplishment required not later than 90 days after the issue date of this Service Bulletin. F. Approval The technical content of this Se rvice Bulletin is approved under the authority of Letter of DOA Acceptance ref. FOCA.21J.002. Pilatus advises Oper ators/Owners to check with their designated Airworthiness Authorities for any changes, local regulations or sanctions that may affect the embodiment of this Service Bulletin.Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 2 of 10 SERVICE BULLETIN

G. Copyright Information © Pilatus Aircraft Ltd. This document contains proprietary information that is protected by copyright. All rights are reserved. No part of this document may be copied, reproduced or translated to other languages without the prior written consent of Pilatus Aircraft Ltd. H. Manpower

I. Weight and Balance (1) Weight Change None. (2) Moment Change None. J. Electrical Load Data Not changed. K. Software Not changed. L. References Aircraft Maintenance Manual (AMM): 12-00-00, 20-31-00. Aircraft Parts Catalog (IPC): 21-50-02. M. Publications Affected None. N. Interchangeability of Parts Not applicable. Man-Hours (No replacement required) Man-Hours (Replacement required) Preparation 1.0 1.0 Inspection 1.0 1.0 Replacement of Cables - 8.0 Repair (Installation of Protective Sleeve) 1.0 - Installation 1.0 1.0 Close up 1.0 1.0 TOTAL MAN-HOURS 5.0 12.0SERVICE BULLETIN

Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 3 of 10 2. Material Information A. Material - Price and Availability No modification kit is necessary to do this Service Bulletin. Operators who require further info rmation on price and availabilit y should contact their Customer Liaison Manager at Pilatus Aircraft Ltd., 6371 Stans, Switzerland. Operators are requested to advise Pilatus Airc raft Ltd, using the Service Bulletin Evaluation Sheet, of the Manufacturer’s Serial Number (M SN) and the flying hours of aircraft which are allocated for this Service Bulletin. B. Material Necessary for Each Aircraft (1) Operator Supplied Materials (Ref. AMM 20-31-00-00)

NOTE: Pilatus P/Ns are given for materials not included in AMM 20-31-00 at the time of Service Bulletin approval. C. Material Necessary for Each Spare None. D. Re-identified Parts None. E. Tooling - Cost and Availability Not applicable. MATERIAL/ PART NO. DESCRIPTION QTY REMARKS
P01-011 SOLVENT, ISOPROPYL ALCOHOL A/R
P02-031 ABSORBENT PAPER A/R P09-004 KOROSEAL BINDING A/R P09-020 TAPE, GLASS FIBER A/R If required P09-017 CABLE TIES, HEAT-RESISTANT A/R If required 917.96.92.154 PROTECTIV E SLEEVE A/R If requiredService Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 4 of 10 SERVICE BULLETIN

3. Accomplishment Instructions WARNING: BE CAREFUL WHEN YOU USE THE CONSUMABLE MATERIALS. THEY ARE DANGEROUS AND CAN CAUSE INJURY. ALWAYS OBEY THE MANUFACTURERS HEALTH AND SAFETY INSTRUCTIONS. A. Preparation Open the engine cowlings (access panels ENG 3L and ENG 3R) (Ref. AMM 12-00-00, Page Block 1). B. Inspection (Ref. Fig. 1) (1) Loosen the hose clamp at one end of the flexible duct. NOTE: You can do this at the end th at is most easy for access. (2) Disconnect and move the flexible duct away from the inspection area. NOTE: The flexible duct installation is shown in IPC 21-50-02, Fig. 02. (3) Do a visual inspection of the flexible ductfor chafing damage. Ifyou find damage that makes the flexible duct unserviceable, remove and discard the flexible duct. (4) Use absorbent paper (Material No. P02-031) made moist with solvent (Material No. P01- 011) to clean the harness in the area to be inspected. (5) Use a bright light source and mirror to do a visual inspection of the harness for chafing damage. (6) If you find chafing on the harness and you can see bare wires under the insulation you must replace the damage d electrical cable(s): (a) Send details/photographs of the damaged cable(s) to this address to get replacement data: PILATUS AIRCRAFT LTD., Customer Technical Support (MCC), P.O. Box 992, 6371 Stans, Switzerland Fax: + 41 (0)41 619 67 73 Email: Techsupport@ pilatus-aircraft.com (b) After replacement of the damaged cable(s), continue with the procedure given in Para D, Installation. (7) If you find chafing on the harness but you cannot see bare wires under the insulation, continue with the procedure given in Para C, Repair. (8) If you find no chafing continue with the pr ocedure given in Para D, Installation.SERVICE BULLETIN

Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 5 of 10 C. Repair (Ref. Fig. 2) (1) Remove the harness clamps and move th e harness away from the engine mounting frame. (2) Use absorbent paper (Material No. P02-031) made moist with solvent (Material No. P01- 011) to clean the harness where yo u will install the protective sleeve. (3) Make sure there are no cable ties around the harness where the protective sleeve is to be installed. Remove cable ties as necessary. (4) Cut a piece of the protective sleeve (P/N 917.96.92.154) long enough to cover the chafed area plus an additional 45 mm (1.75 in.) at each end. When you cut the protective sleeve: (a) Use sharp scissors to cut the sleeve to the correct length. Make sure the cut is straight. (b) Pull all loose fibers away from the cut end(s) with your fingers and then remove the fibers with scissors. (c) Make sure no more fibers can come loose. (5) Wrap glass fiber tape (Material No. P09-020) around the harness at the ends of the repair area (as shown on Figure 2). (6) Fold 20 mm (0.75 in.) at the two ends of the protective sleeve inwards to make a double layer. (7) Wrap the protective sleeve around the harn ess with the doubled ends located over the glass fiber tape. (8) Install a cable tie (Material No. P09-017) at the ends of the protective sleeve to hold it in place. (9) If necessary, install additional cable ties (M aterial No. P09-017) on the harness. You can install cable ties over the protective sleeve if required. (10) Install the harness clamps to attach the harness to the engine mounting frame. D. Installation (Ref. Fig. 1) (1) Install the flexible duct and tighten the hose clamp(s). NOTE: The flexible duct installation is shown in IPC 21-50-02, Fig. 02. (2) Use Koroseal binding (Material No. P09-004), as required, to secure the flexible duct to the engine mounting frame. Do this to prevent movement of the flexible duct which could cause chafing. E. Job Close-Up (1) Remove all equipment, materials and tools from the work area. Make sure that the work area is clean. (2) Close the engine cowlings (a ccess panels ENG 3L and ENG 3R).Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 6 of 10 SERVICE BULLETIN

F. Documentation (1) Make an entry in the Aircraft Logbook that this Service Bulletin has been incorporated. (2) Use the Service Bulletin Evaluation Sheet and report your results and the serial number of the aircraft to PILATUS.SERVICE BULLETIN

Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 7 of 10 Inspection

Figure 1SB 2360 

# A



# A

INSPECTION AREA WIRING HARNESS

FLEXIBLE DUCTService Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 8 of 10 SERVICE BULLETIN

Repair Figure 2SB 2361 CABLE TIE

20 mm

PROTECTIVE SLEEVE HARNESS TAPESERVICE BULLETIN

Service Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 9 of 10



## SERVICE BULLETIN EVALUATION SHEET FOR SB No. 24-009 Title Electrical Power - General Inspection for Chafing on an Elect rical Harness in the Engine Compartment Customer Service Center 

### EMBODIMENT REPORTING This SB has been embodied: On the entire fleet Only partially Provide embodiment details per aircraft (use additional copies of this table, if necessary) 

### MSN Flying Hours MSN Flying Hours

Additional embodiment comments/findings

EDITORIAL COMMENTS (procedure, kit quality, su ggested improvements, etc.)

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Please complete and forward this form to: Pilatus Aircraft LTD, Customer Technical Support (MCC), P.O. BOX 992, 6371 Stans, Switzerland Fax: +41 (0)41 619 6773 Email: Techsupport@ pilatus-aircraft.com 

### SERVICE BULLETIN EVALUATION SHEETService Bulletin No: 24-009 Date: Sep 06/13 Rev. No. Date: Page 10 of 10 SERVICE BULLETIN

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