# Bombardier Service Bulletin 60-26-4 Copy: No revision named ("U.S. DOT/FAA - Bombardier SB 60-26-4"), 8 pages: PDF https://openairdocs.org/files/sha256/b2/bc/b2bcf63e3edf47d1b9f4eea7b9890eaa40d1cd0302bb3ec3e81b263dc62713b4; text https://openairdocs.org/service-documents/bombardier/sb-60-26-4/file/b2bcf63e3edf.md. Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-1258; AD 2012-08-16 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [Bombardier](https://openairdocs.org/service-documents/bombardier.md) - Type: Service bulletin (Service Bulletin) - Number: 60-26-4 - Page: https://openairdocs.org/service-documents/bombardier/sb-60-26-4 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2012-08-16](https://openairdocs.org/ad/2012-08-16.md), effective May 29, 2012: No revision named Also cited in [1 proposed AD](https://openairdocs.org/service-documents/bombardier/sb-60-26-4/proposed.md). ## Text (8 pages) Rights: © Bombardier Inc. Filed by the FAA in regulations.gov docket FAA-2011-1258; AD 2012-08-16 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. This text is OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 (OCR) BOMBARDIER LEARJET 60 SB 60-26-4 Recommended Service Bulletin If you cannot complete the instructions in this publication because of an STC change to the aircraft, speak to the STC holder or the regional Federal Aviation Administration (FAA) office for information and disposition. Contact Information Distribution Date Business Aircraft May 2, 2011 Learjet Inc. MS 53 P.O. Box 7707 Wichita, Kansas 67277-7707 Customer Response Center (CRC) 1-866-538-0247 (Toll Free) (316) 946-6100 (Tel) Push 2 for Parts Logistics or push 4 then push 1 for Technical Publications. FIRE PROTECTION - INSPECTION/MODIFICATION OF THE FIRE EXTINGUISHER SQUIB WIR- ING 1. Planning Information A. Effectivity (1) Learjet 60-002 thru 60-366. B. Reason (1) Due to the locations of the forward and aft fire extinguisher containers squibs, it is possible to . reverse the electrical wiring between the left and right squibs. Improper wiring of the squibs could cause a fire container's extinguishing agent to be delivered to the wrong engine in the event of an engine fire. C. Description (1) This service bulletin provides instructions to inspect the electrical leads routed to the fire extin- guisher containers (E25, FWD No. 1 and E26, AFT No. 2) for proper identification and to make sure that the electrical leads are connected to the correct squibs. These commodities, tech with the Export Administration Regulasons. Diversion contrary to U d States law is prohibited 1d States in accordano this publication is performed in compliance with ma eler to applicable government agency regu commendatons andior accoptable industry standards make sure that the work described This document is proprietary to Bombardier Inc. and'or its a a fray not be reproduced or copied in any form or b All rights reserved Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 1 of 8 ### Page 2 (OCR) LEARJET 60 Service Bulletin D. Compliance (1) Recommended - Bombardier Learjet Inc. recommends that you complete these instructions within the next 300 flight hour inspection or the next time the APU is removed. E. Approval (1) The Federal Aviation Administration (FAA) has approved the technical content in this publication that has an effect on the airplane type design. (2) The European Aviation Safety Agency (EASA) has accepted the technical content in this publica- tion that has an effect on the airplane type design. F. Labor Hours - Estimated Accomplishment Time INSPECT ONLY INSPECT AND REWORK TASK 0.5 0.5 Labor hours to gain access. 1.0 1.5 Labor hours to do the aircraft modification. N/A 0.5 Labor hours to do a functional test/operational check. 1.0 1.0 Labor hours to return the aircraft to airworthy status. 2.5 3.5 Total Labor Hours (* See Note) (* See Note) NOTE: * These are estimated labor hours to complete these service bulletin instructions with the APU already removed from the aircraft. These labor hours are an estimate and are for planning purposes only. Facility and per- sonnel capabilities may cause the labor hours to change. G. Expense Coverage (1) Labor Coverage (a) Aircraft in the Learjet manufactured warranty period, labor coverage is provided. NOTE: For labor coverage to apply, you must complete these instructions at a Bombar- dier Business Aviation Service Facility or at a Bombardier Learjet Authorized Ser- vice Facility. You must complete these instructions within 24 months from the Basic Issue distribution date of this publication. (2) Smart Parts Plus Coverage (b) Aircraff out of the Learjet manufactured warranty period, no labor coverage is provided. (a) None. Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 2 of 8 ### Page 3 (OCR) LEARJET 60 Service Bulletin H. Material Required (1) There are no kits associated with these instructions. (2) Other materials/parts that may be necessary to complete these instructions. PART NUMBER NOMENCLATURE QTY SUPPLIER MIL-I-23053/5 Heat Shrink Tubing A/R Obtain locally (or equivalent) 320552 Ring Terminal 4 Tyco Electronics or Obtain locally 1. Tools and Equipment (1) None. J. Weight and Balance (1) Negligible. K. References (1) Learjet Maintenance Manual, Chapters 24 and 52. (2) Refer to PATS Maintenance Manual Supplement, Chapter 49. L. Other Publications Affected (1) Learjet Aircraft Maintenance Manual, Chapter 26. 2. Material Information A. Parts Required (1) There are no kits associated with these instructions. Refer to Paragraph 1.H. for more materials/ parts necessary to complete these instructions. 3. Accomplishment Instructions A. Gain Access WARNING: ELECTRICALLY DISCONNECT THE FIRE BOTTLES BEFORE YOU DO THE STEPS THAT FOLLOW. IF YOU DO NOT DO THIS, PERSONNEL INJURY AND DAMAGE TO THE EQUIPMENT CAN OCCUR IF THE BOTTLES ARE FIRED. (1) Pull the L FIRE EXT and R FIRE EXT circuit breakers. (2) Set the battery switches off. (3) Open the tailcone access door. (Refer to Chapter 52 of the Maintenance Manual.) (4) Disconnect the aircraft batteries. (Refer to Chapter 24 of the Maintenance Manual.) (5) Remove equipment as necessary to access to the engine fire extinguisher containers (E25, FWD No. 1; E26, AFT No. 2). Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 3 of 8 ### Page 4 (OCR) LEARJET 60 Service Bulletin B. Modification of Aircraft CAUTION: USE EXTREME CARE WHEN IDENTIFYING AND RELOCATING ELECTRICAL WIRING TO PREVENT DAMAGE TO SYSTEMS OR COMPONENTS. (1) Locate the forward fire extinguisher container (E25, FWD No. 1). (See Figure 1.) (2) Locate the electrical wiring routed to the forward fire extinguisher container and make sure the positive wires are identified correctly. (See Figure 2.) (3) On aircraft where the positive electrical leads are properly labeled, continue with Paragraph (4) On aircraft where the positive electrical leads are improperly labeled or the label is missing, do as follows: (a) Correct wiring labels with a permanent marker or replace the labels with new heat shrink tub- ing or equivalent heat rated tape and properly identify. (See Figure 2.) NOTE: If heat shrink tubing is used, the ring terminals will need to be removed and rein- stalled. (Refer to Paragraph 1.H.(2) for ring terminal part number.) (5) Check the wire routing of the forward fire extinguisher container squibs (E25, FWD No. 1) as fol- lows: (See Figure 1 and Figure 2.) (a) Wire code W62C20 must be connected to the FWD RH fire extinguisher container squib. (b) Wire code W64C20 must be connected to FWD LH fire extinguisher container squib. (6) On aircraft where the fire extinguisher container squib wires are installed correctly. go to Para- graph 3.B.(8). (See Figure 2.) (7) On aircraft where the fire extinguisher container squib wires are not installed correctly, continue during the Operational Check. with the next paragraph to locate the aft fire extinguisher container. Wire routing will be corrected (8) Locate the aft fire extinguisher container (E26, AFT No. 2). (See Figure 1.) (9) Locate the electrical wiring routed to the aft fire extinguisher container and make sure the positive wires are identified correctly. (See Figure 2.) (10) On aircraft where the positive electrical leads are properly labeled, continue with Paragraph 3.B. (12). (11) On aircraft where the positive electrical leads are improperly labeled or the label is missing, do as follows: (a) Correct wiring labels with a permanent marker or replace the labels with new heat shrink tub- ing or equivalent heat rated tape and properly identify. Figure 2 NOTE: If heat shrink tubing is used, the ring terminals will need to be removed and rein- stalled. (Refer to Paragraph 1.H.(2) for ring terminal part number.) Check the wire routing of the aft fire extinguisher container squibs (E26, AFT No. 2) as follows: (See Figure 1 and Figure 2.) (a) Wire code W63C20 must be connected to the AFT LH fire extinguisher container squib. (b) Wire code W58C20 must be connected to the AFT RH fire extinguisher container squib. On aircraft where the electrical wires were installed correctly, continue to Paragraph 3.D to return the aircraft to airworthy status. On aircraft where the electrical wires were not installed correctly, continue to Paragraph 3.C for the Operational Check. Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 4 of 8 ### Page 5 (OCR) LEARJET 60 Service Bulletin C. Functional Test/Operational Check (1) Disconnect the wires W62C20 and W64C20 from the forward left and right squib (E25, FWD No. • 1) terminal lugs and make sure they can not come in contact with the aircraft structure and electri- cal components. (2) Disconnect the wires W63C20 and W58C20 from the aft left and right squib (E26, AFT No. 2) ter- minal lugs and make sure they can not come in contact with the aircraft structure and electrical (3) Connect the aircraft batteries. (Refer to Chapter 24 of the Maintenance Manual.) (4) Make sure that the L FIRE EXT and R FIRE EXT circuit breakers are pulled. (5) Make sure that BATTERY 1 and BATTERY 2 switches are OFF. (6) Connect the wires to the forward fire extinguisher squibs (E25, FWD No. 1) as follows: (a) Connect wire W64C20 to the FWD LH fire extinguisher container squib (E25 No. 1) terminal. (b) Connect wire W62C20 to the FWD RH fire extinguisher container squib (E25 No. 1) terminal. (7) Set BATTERY 1 and BATTERY 2 switches ON. CAUTION: DO NOT PUSH THE ENG ARMED ANNUNCIATOR/SWITCH WITH THE ENG FIRE TEE-HANDLE PULLED AND ENG ARMED ANNUNCIATOR ON OR THE FIRE BOTTLE WILL DISCHARGE. (8) Pull the pilot's ENG FIRE PULL tee-handle out. (9) Make sure that the ENG EXT ARMED annunciator on the pilot's instrument panel comes on and • the copilot's ENG EXT ARMED annunciator does not come on. (10) Push the pilot's tee-handle in. (11) Pull the copilot's ENG FIRE PULL tee handle out. (12) Make sure that the pilot's ENG EXT ARMED annunciator comes on and the copilot's ENG EXT ARMED annunciator does not come on. (13) Push the copilot's ENG FIRE PULL tee handle in. (14) Set BATTERY 1 AND BATTERY 2 switches OFF. (15) Connect the wires to the aft fire extinguisher squibs (E26, AFT No. 2) as follows: (a) Connect wire W63C20 to the AFT LH fire extinguisher container squib (E26 No. 2) terminal. (b) Connect wire W58C20 to the AFT RH fire extinguisher container squib (E26 No. 2) terminal. (16) Set BATTERY 1 and BATTERY 2 switches ON. (17) Set the SYSTEM TEST switch to FIRE DET. (18) Push and hold the PRESS TEST switch. (19) Make sure that the ENG EXT ARMED annunciator located on the pilot's switch panel comes on. (21) Release the PRESS TEST switch. (20) Make sure that the ENG EXT ARMED annunciator located on the copilot's switch panel comes on. (22) Set the test switch to OFF. (23) Pull the pilots ENG FIRE PULL tee-handle out. (24) Make sure that the pilot's and copilot's ENG EXT ARMED annunciator comes on. (25) • Push the pilot's ENG FIRE PULL tee-handle in. (26) Pull the copilot's ENG FIRE PULL tee-handle out. (27) Make sure that the pilot's and copilot's ENG EXT ARMED annunciator comes on. (28) Push the copilot's ENG FIRE PULL tee-handle in. (29) Set BATTERY 1 and BATTERY 2 switches OFF. Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 5 of 8 ### Page 6 (OCR) LEARJET 60 Service Bulletin D. Return Aircraft to Airworthy Status (1) Install equipment that was removed to complete this modification. Do not install the APU at this (2) Connect the batteries to the aircraft. (Refer to Chapter 24 of the Maintenance Manual.) (3) If necessary, install the APU. (Refer to PATS Maintenance Manual Supplement, Chapter 49.) (4) Close and secure the tailcone access door. (Refer to Chapter 52 of the Maintenance Manual.) (5) Push the L FIRE EXT and R FIRE EXT circuit breakers in. E. Compliance Response Form (1) Complete the compliance response form. (2) Send the compliance response form to Learjet Inc. as soon as possible. F. Aircraft Maintenance Records (1) Complete the Aircraft Maintenance Records in accordance with the regulatory requirements of your aircraft certification authority. Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 6 of 8 ### Page 7 (OCR) LEARJET 60 Service Bulletin FIRE EXTINGUISHER CONTAINER NO. 2 (E26, AFT) (REF) FIRE EXTINGUISHER CONTAINER NO. 1 (E25, FWD) (REF) RH AFT SQUIB (REF) LH AFT SQUIB (REF) HFWD RH FWD SQUIB (REF) LH FWD SQUIB (REF) Detail A K60-602604-001-01 Fire Extinguisher Container Squibs Figure 1 Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 7 of 8 ### Page 8 (OCR) LEARJET 60 Service Bulletin E25 NO. 1 FIRE EXTINGUISHER CONTAINER W64C20 LH RH ENGINE ENGINE - W62C20 CARTRIDGE CARTRIDGE (SQUIB) (SQUIB) WB6A20N M W87A20N E26 NO. 2 FIRE EXTINGUISHER CONTAINER W63C20 LH RH ENGINE ENGINE • W58C20 CARTRIDGE CARTRIDGE! (SQUIB) (SQUIB) W84A20N W85A20N NOTES No. 8 terminal at this location. No. 10 terminal at this location. WIRE CODE Label wire W64C20 as "E25 FWD LH" ---- Represents Existing Wires and Components. Label wire W62C20 as "E25 FWD RH" -*? Represents Wire is Continued. Label wire W63C20 as "E26 AFT LH" Label wire W58C20 as "E26 AFT RH" K60-602604-002-01 Fire Extinguisher Container Squib Wiring Figure 2 Basic Issue: May 2/11 THIS PUBLICATION IS AVAILABLE AT: SB 60-26-4 www.cic.bombardier.com Page 8 of 8 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.