Conquest SERVICE BULLETIN CQB-34-01

CESSNA CONQUEST II · Maintenance Manual

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Overview

This service bulletin provides instructions for the replacement of the stall warning horn on Cessna Model 425 and 441 aircraft. The original stall warning horn is no longer available, and this document outlines the necessary parts and procedures for installing a new stall warning horn, which requires an additional bracket. The bulletin is optional and can be performed at the owner's discretion. It includes detailed compliance instructions, material requirements, and labor hours needed for the modification, ensuring that maintenance personnel can effectively carry out the replacement process while adhering to safety and regulatory standards.

This service bulletin is for Cessna Model 425 and 441 aircraft.
The original stall warning horn is no longer available; a new horn requires an additional bracket for installation.
Compliance with this bulletin is optional and at the owner's discretion.
Step-by-step instructions are provided for the removal and installation of the stall warning horn.
Safety precautions must be followed, including grounding the aircraft and disconnecting electrical power.

Document

Source

Originally published by cessnaowner.org. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

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Document details

Type: Maintenance Manual
Year: 2022
Pages: 20
File size: 2.4 MB
Publisher: cessnaowner.org

Documentation completeness

2/7

Most owners only have the POH. Here's the essential set for the CESSNA CONQUEST II.

Pilot's Operating Handbook / AFM
Checklist
Maintenance Manual
Parts Catalog (IPC)
Systems & Wiring
Service Bulletins
Type Certificate (TCDS)

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In this document

Effectivity

This service bulletin applies to Cessna Model 425 aircraft with serial numbers 425-0001 through 425-0236 and Cessna Model 441 aircraft with serial numbers 441-0001 through 441-0362.

Compliance

The compliance with this service bulletin is optional and can be performed at the discretion of the aircraft owner. It is essential that all instructions are followed precisely to ensure proper installation and functionality.

Accomplishment Instructions

The document provides step-by-step instructions for the removal of the original stall warning horn and the installation of the new stall warning horn. It includes detailed procedures for disconnecting electrical power, removing old components, and installing new parts, including specific tools and materials required.

Material Information

The bulletin lists the necessary parts and kits required for the installation of the new stall warning horn. Each configuration (1, 2, and 3) has specific part numbers and quantities, ensuring that maintenance personnel have the correct materials for the job.

Safety Notes

It is crucial to ensure that the aircraft is electrically grounded and that all switches are in the OFF/NORM position before beginning maintenance. Maintenance warning tags should be applied to prevent accidental reconnection of electrical power during the procedure.

Safety notes

Ensure the aircraft is electrically grounded before maintenance.
Disconnect electrical power from the aircraft before beginning work.
Use maintenance warning tags to prevent accidental reconnection of power.

Full document text

Conquest SERVICE BULLETIN CQB-34-01 TITLE NAVIGATION - STALL WARNING HORN REPLACEMENT EFFECTIVITY MODEL SERIAL NUMBERS 425 425-0001 thru 425-0236 441 441-0001 thru 441-0362 REASON The original stall warning horn is no longer available. If the stall warning horn needs to be replaced, a new stall warning horn is available and will require an additional bracket for installation. DESCRIPTION This service document provides parts and instructions to remove the original stall warning horn and install a new stall warning horn. NOTE: At the customer's discretion, they may choose to replace only the stall warning horn, or the landing gear warning horn and the stall warning horn together. • CONFIGURATION 1: Aircraft replacing the 9910080-2 Stall Warning Horn and the 9910080-1 Landing Gear Warning Horn. • CONFIGURATION 2: Aircraft replacing only the 9910080-2 Stall Warning Horn. • CONFIGURATION 3: Aircraft that have installed CONFIGURATION 2, from CQB-32-01: Landing Gear Warning Horn Replacement, that have a 9910080-5 Landing Gear Warning Horn, and the 9910080-2 Stall Warning Horn needs to be replaced. NOTE: If the customer would like to replace the landing gear warning horn in conjunction with the stall warning horn, refer to CQB-32-01: Landing Gear Warning Horn Replacement. COMPLIANCE OPTIONAL. This service document can be accomplished at the discretion of the owner. A service document published by Textron Aviation may be recorded as completed in an aircraft log only when the following requirements are satisfied: 1) The mechanic must complete all of the instructions in the service document, including the intent therein. 2) The mechanic must correctly use and install all applicable parts supplied with the service document kit. Only with written authorization from Textron Aviation can substitute parts or rebuilt parts be used to replace new parts. 3) The mechanic or airplane owner must use the technical data in the service document only as approved and published. 4) The mechanic or airplane owner must apply the information in the service document only to aircraft serial numbers identified in the Effectivity section of the document. 5) The mechanic or airplane owner must use maintenance practices that are identified as acceptable standard practices in the aviation industry and governmental regulations. CQB-34-01 October 11, 2022 Page 1 of 18 Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800 This document contains technical data and is subject to U.S. export regulations. This information has been exported from the United States in accordance with export administration regulations. Diversion contrary to U.S. law is prohibited. ECCN: 9E991 COPYRIGHT © 2022 CQB-34-01 Page 2 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 No individual or corporate organization other than Textron Aviation is authorized to make or apply any changes to a Textron Aviation-issued service document or flight manual supplement without prior written consent from Textron Aviation. Textron Aviation is not responsible for the quality of maintenance performed to comply with this document, unless the maintenance is accomplished at a Textron Aviation-owned Service Center. APPROVAL Textron Aviation received FAA approval for the technical data in this publication that changes the airplane type design. FLIGHT CREW OPERATIONS No Changes CONSUMABLE MATERIAL You must use the consumable materials that follow, or their equivalent, to complete this service document. NAME NUMBER MANUFACTURER USE Color Chemical Film Treatment U074093 (Alodine 1132 Touch n Prep) Textron Aviation Parts Distribution 7121 Southwest Boulevard Wichita, KS 67215 To protect bare aluminum surface. TOOLING No specialized tooling is required to complete this service document. WEIGHT AND BALANCE INFORMATION Negligible REFERENCES Cessna Model 425 Maintenance Manual Cessna Model 441 Maintenance Manual CQB-32-01: Landing Gear Warning Horn Replacement PUBLICATIONS AFFECTED Cessna Model 425 Parts Catalog Cessna Model 441 Parts Catalog ACCOMPLISHMENT INSTRUCTIONS 1. Prepare the airplane for maintenance. A. Make sure that the airplane is electrically grounded. B. Make sure that all switches are in the OFF/NORM position. C. Disconnect electrical power from the airplane. (1) Disconnect external electrical power. (2) Disconnect the airplane battery. D. Attach maintenance warning tags to the battery and external power receptacle that have "DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS" written on them. E. Gain access as necessary to do the stall warning horn replacement. (Refer to the applicable Maintenance Manual, Chapter 25, Flight Compartment Trim and Panels - Maintenance Practices.) Conquest SERVICE BULLETIN CQB-34-01 CONFIGURATION 1 NOTE: To install the 9910080-5 Landing Gear Warning Horn, reference CONFIGURATION 1 procedures and parts from CQB-32-01: Landing Gear Warning Horn Replacement. 2. (Refer to Figure 1, Sheet 1.) Remove the 9910080-2 Stall Warning Horn as follows: A. Disconnect and label the electrical wiring from the 9910080-1 Landing Gear Warning Horn and the 9910080-2 Stall Warning Horn. B. Remove the four rivets from the 5718117-5 Tee. (Refer to the applicable Maintenance Manual, Chapter 51, Fastener Installation and Removal.) C. Remove and discard the screw, nut, and lock washer from the 9910080-1 Landing Gear Warning Horn. D. Remove and discard the screw, nut, and lock washer from the 9910080-2 Stall Warning Horn. E. Remove and keep the two mounting screws from the 5118331-6 Channel Support. NOTE: The kept mounting screws will be used for installation. F. Discard the lock washers and the 5118331-6 Channel Support. G. Keep the 5618033-1 Insulator. NOTE: The kept 5618033-1 Insulator will be used for installation. 3. (Refer to Figure 2, Sheet 1, 2, and 3.) Install the 9910080-6 Stall Warning Horn as follows: A. Align the existing holes of the 5618033-1 Insulator onto the 5718117-5 Tee.

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B. Put the 5990604-2 Bracket onto the 5618033-1 Insulator. C. Match drill the two 0.147 inch diameter holes of the 5990604-2 Bracket into the 5618033-1 Insulator and the 5718117-5 Tee. (1) Debur the drilled holes from the 5618033-1 Insulator and the 5718117-5 Tee. (2) Apply Color Chemical Film Treatment to all bare metal. D. Install two MS21069L06 Nutplates with four MS20426AD3-6A Rivets onto the 5718117-5 Tee. (Refer to the applicable Maintenance Manual, Chapter 51, Fastener Installation and Removal.) E. Put the drilled holes of the 5618033-1 Insulator onto the drilled holes of the 5718117-5 Tee. F. Install the 5990604-2 Bracket with two MS35206-228 Screws and two NAS1149FN616P Washers. G. Install the 9910080-6 Stall Warning Horn into the 5990604-2 Bracket. H. Install the knurled nut onto the 9910080-6 Stall Warning Horn. NOTE: The plastic knurled nut must be installed with the three indents toward the bracket and horn assembly. On the internal circumference, the smooth side without threads is installed first, towards the bracket and horn. This technique of installation will make sure the nut fully seats against the bracket and not bottom-out on the threads. If not installed correctly the knurled nut will bottom-out on the threads and the horn assembly will not be fully tightened to the bracket. I. Install the 9910080-5 Landing Gear Warning Horn. (Refer to CQB-32-01: Landing Gear Warning Horn Replacement, CONFIGURATION 1.) J. Install the 5718117-5 Tee. (Refer to CQB-32-01: Landing Gear Warning Horn Replacement, CONFIGURATION 1.) K. Install the labeled electrical wiring and screws into the 9910080-6 Stall Warning Horn. NOTE: The screws are supplied with the 9910080-6 Stall Warning Horn. 4. Connect the airplane battery. CQB-34-01 October 11, 2022 Page 3 CQB-34-01 Page 4 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 5. Put the airplane battery switch to the ON position. 6. Do the Operational, Ground Check, of the Stall Warning System. (Refer to the applicable Maintenance Manual, Chapter 27, Stall Warning - Maintenance Practices.) 7. Go to Step, 19. CONFIGURATION 2 8. (Refer to Figure 1, Sheet 1.) Remove the 9910080-2 Stall Warning Horn as follows: A. Disconnect and label the electrical wiring from the 9910080-1 Landing Gear Warning Horn and the 9910080-2 Stall Warning Horn. B. Remove the four rivets from the 5718117-5 Tee. (Refer to the applicable Maintenance Manual, Chapter 51, Fastener Installation and Removal.) C. Remove and discard the screw and lock washer from the 9910080-2 Stall Warning Horn. D. Discard the 9910080-2 Stall Warning Horn. E. Remove and keep the screw and lock washer from the 9910080-1 Landing Gear Warning Horn. NOTE: The kept screw and lock washer will be used for installation. F. Keep the 9910080-1 Landing Gear Warning Horn. NOTE: The kept 9910080-1 Landing Gear Warning Horn will be used for installation. G. Remove and keep the mounting screws, lock washers, and the 5118331-6 Channel Support. NOTE: The kept mounting screws, lock washers, and the 5118331-6 Channel Support will be used for installation. 9. (Refer to Figure 3, Sheet 1, 2, and 3.) Install the 9910080-6 Stall Warning Horn as follows: A. Align the existing holes of the 5618033-1 Insulator onto the 5718117-5 Tee. B. Put the 5990604-2 Bracket onto the 5618033-1 Insulator. C. Match drill the two 0.147 inch diameter holes of the 5990604-2 Bracket into the 5618033-1 Insulator and the 5718117-5 Tee. (1) Debur the drilled holes from the 5618033-1 Insulator and the 5718117-5 Tee. (2) Apply Color Chemical Film Treatment to all bare metal. D. Install two MS21069L06 Nutplates with four MS20426AD3-6A Rivets onto the 5718117-5 Tee. (Refer to the applicable Maintenance Manual, Chapter 51, Fastener Installation and Removal.) E. Put the drilled holes of the 5618033-1 Insulator onto the drilled holes of the 5718117-5 Tee. F. Install the 5990604-2 Bracket with two MS35206-228 Screws and two NAS1149FN616P Washers. G. Install the 9910080-6 Stall Warning Horn into the 5990604-2 Bracket. H. Install the knurled nut onto the 9910080-6 Stall Warning Horn. NOTE: The plastic knurled nut must be installed with the three indents toward the bracket and horn assembly. On the internal circumference, the smooth side without threads is installed first, towards the bracket and horn. This technique of installation will make sure the nut fully seats against the bracket and not bottom-out on the threads. If not installed correctly the knurled nut will bottom-out on the threads and the horn assembly will not be fully tightened to the bracket. I. Install the 5118331-6 Channel Support with the mounting screws and lock washers into the existing holes of the 5618033-1 Insulator. Conquest SERVICE BULLETIN CQB-34-01 J. Install the 9910080-1 Landing Gear Warning Horn onto the forward side of the 5118331-6 Channel Support with the screw and lock washer. K. Install the 5718117-5 Tee with four CR3214-4-2 Pull Fasteners onto the frame. L. Install the labeled electrical wiring into the 9910080-1 Landing Gear Warning Horn. M. Install the labeled electrical wiring and screws into the 9910080-6 Stall Warning Horn. NOTE: The screws are supplied with the 9910080-6 Stall Warning Horn. 10. Connect the airplane battery. 11. Put the airplane battery switch to the ON position. 12. Do the Operational, Ground Check, of the Stall Warning System. (Refer to the applicable Maintenance Manual, Chapter 27, Stall Warning - Maintenance Practices.) 13. Do the operational check for the landing gear warning horn as follows: NOTE: For additional information on the landing gear warning horn operation refer to the applicable Maintenance Manual, Chapter 32, Position and Warning - Description and Operation. A. Do the Landing Gear Functional Test, Operational Check, to retract the landing gear into the up and locked position. (Refer to the applicable Maintenance Manual, Chapter 32, Landing Gear General - Maintenance Practices.) NOTE: Keep the landing gear in the up and locked position during the landing gear warning horn operational test. B. Extend the flaps below the 15-degree position. NOTE: For aircraft model 441 extend the flaps to the APPROACH position. C. Make sure that the landing gear warning horn operates once the flaps are below the 15-degree position. NOTE: For the aircraft model 441, the landing gear warning horn operates once the flaps are below the APPROACH position. D. Retract the flaps to the 0-degree position. E. Extend the gear to the down and locked position. F. Make sure that the gear is extended and locked. NOTE: The three green down and lock lights must be illuminated. G. Remove the hydraulic cart. ( Refer to the applicable Maintenance Manual, Chapter 29, General - Maintenance Practices.) H. Remove airplane from jacks. (Refer to the applicable Maintenance Manual, chapter 7, Jacking Instructions.) 14. Go to Step, 19. CONFIGURATION 3 NOTE: Make sure that CONFIGURATION 2 from CQB-32-01: Landing Gear Warning Horn Replacement has been installed. 15. (Refer to Figure 4, Sheet 1.) Remove the 9910080-2 Stall Warning Horn as follows: A. Disconnect the electrical wiring from the 9910080-2 Stall Warning Horn. B. Remove and discard the screw and lock washer from the 9910080-2 Stall Warning Horn. C. Discard the 9910080-2 Stall Warning Horn. CQB-34-01 October 11, 2022 Page 5 CQB-34-01 Page 6 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 D. Remove and keep the mounting screws from the 5118331-6 Channel Support. NOTE: The kept mounting screws will be used for installation. E. Discard the lock washers and the 5118331-6 Channel Support. 16. (Refer to Figure 5, Sheet 1 and 2.) Install the 9910080-6 Stall Warning Horn as follows: A. Put the 5990604-2 Bracket onto the existing holes of the 5718117-5 Tee. B. Install the two mounting screws with two NAS1149FN616P Washers into the 5990604-2 Bracket. C. Install the 9910080-6 Stall Warning Horn into the 5990604-2 Bracket. D. Install the knurled nut onto the 9910080-6 Stall Warning Horn. NOTE: The plastic knurled nut must be installed with the three indents toward the bracket and horn assembly. On the internal circumference, the smooth side without threads is installed first, towards the bracket and horn. This technique of installation will make sure the nut fully seats against the bracket and not bottom-out on the threads. If not installed correctly the knurled nut will bottom-out on the threads and the horn assembly will not be fully tightened to the bracket. E. Install the wiring and screws into the 9910080-6 Stall Warning Horn. NOTE: The screws are supplied with the 9910080-6 Stall Warning Horn. 17. Connect the airplane battery. 18. Do the Operational, Ground Check, of the Stall Warning System. (Refer to the applicable Maintenance Manual, Chapter 27, Stall Warning - Maintenance Practices.) 19. Put the battery switch to the OFF position. 20. Install all access panels and upholstery items that were removed during this bulletin. (Refer to the applicable Maintenance Manual, Chapter 25, Flight Compartment Trim and Panels - Maintenance Practices.) 21. Remove the maintenance warning tags and connect the airplane battery. 22. Make an entry in the airplane logbook that states compliance and method of compliance with this service document. NOTE: Textron Aviation recommends that compliance with all service documents is reported to a maintenance tracking system provider. • Complete a record of compliance. (Maintenance Transaction Report, Log Book Entry, or other record of compliance.) • Put a copy of the completed record of compliance in the airplane logbook. • Send a copy of the completed record of compliance to the maintenance tracking system provider used. Conquest SERVICE BULLETIN CQB-34-01 Figure 1. Before Modification (Sheet 1) CQB-34-01 October 11, 2022 Page 7 CQB-34-01 Page 8 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 Figure 2. After Modification (Sheet 1) Conquest SERVICE BULLETIN CQB-34-01 Figure 2. After Modification (Sheet 2) CQB-34-01 October 11, 2022 Page 9 CQB-34-01 Page 10 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 Figure 2. After Modification (Sheet 3) Conquest SERVICE BULLETIN CQB-34-01 Figure 3. After Modification (Sheet 1) CQB-34-01 October 11, 2022 Page 11 CQB-34-01 Page 12 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 Figure 3. After Modification (Sheet 2) Conquest SERVICE BULLETIN CQB-34-01 Figure 3. After Modification (Sheet 3) CQB-34-01 October 11, 2022 Page 13 CQB-34-01 Page 14 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 Figure 4. Before Modification (Sheet 1) Conquest SERVICE BULLETIN CQB-34-01 Figure 5. After Modification (Sheet 1) CQB-34-01 October 11, 2022 Page 15 CQB-34-01 Page 16 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 Figure 5. After Modification (Sheet 2) Conquest SERVICE BULLETIN CQB-34-01 MATERIAL INFORMATION NOTE: CONFIGURATION 1: Order the kit below to install this modification. NOTE: To install the 9910080-5 Landing Gear Warning Horn in conjunction with the 9910080-6 Stall Warning Horn, order the kit CONFIGURATION 1 from CQB-32-01: Landing Gear Warning Horn Replacement. NEW P/N QUAN- TITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION CQB-34-01-0 1 Kit, consisting of the following parts: MS20426AD3-6A 4 Rivet N/A Install MS21069L06 2 Nut Plate N/A Install MS35206-228 2 Screw N/A Install NAS1149FN616P 2 Washer N/A Install 5990604-2 1 Bracket 5118331-6 Discard 9910080-6 1 Stall Warning Horn 9910080-2 Discard CQB-34-01 1 Instructions NOTE: CONFIGURATION 2: order the kit below to install this modification. NEW P/N QUAN- TITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION CQB-34-01-1 1 Kit, consisting of the following parts: CR3214-4-2 4 Pull Fastener N/A Install MS20426AD3-6A 4 Rivet N/A Install MS21069L06 2 Nut Plate N/A Install MS35206-228 2 Screw N/A Install NAS1149FN616P 2 Washer N/A Install 5990604-2 1 Bracket N/A Install 9910080-6 1 Stall Warning Horn 9910080-2 Discard CQB-34-01 1 Instructions CQB-34-01 October 11, 2022 Page 17 CQB-34-01 Page 18 October 11, 2022 Conquest SERVICE BULLETIN CQB-34-01 NOTE: CONFIGURATION 3: Order the kit below to install this modification. NOTE: Prior to order this kit make sure that CONFIGURATION 2 from CQB-32-01: Landing Gear Warning Horn Replacement has been installed. NEW P/N QUAN- TITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION CQB-34-01-2 1 Kit, consisting of the following parts: NAS1149FN616P 2 Washer N/A Discard 5990604-2 1 Bracket 5118331-6 Discard 9910080-6 1 Stall Warning Horn 9910080-2 Discard CQB-34-01 1 Instructions * Please contact a Textron Aviation Authorized Service Facility for current cost and availability of parts listed in this service document. Based on availability and lead times, parts may require advanced scheduling. Conquest OWNER ADVISORY CQB-34-01 TITLE NAVIGATION - STALL WARNING HORN REPLACEMENT TO: Cessna Model 425 and 441 Aircraft Owner REASON The original stall warning horn is no longer available. If the stall warning horn needs to be replaced, a new stall warning horn is available and will require an additional bracket for installation. COMPLIANCE OPTIONAL. This service document can be accomplished at the discretion of the owner. LABOR HOURS WORK PHASE LABOR-HOURS Modification As Necessary MATERIAL AVAILABILITY PART NUMBER AVAILABILITY COST CQB-34-01-0 * * CQB-34-01-1 * * CQB-34-01-2 * * * Please contact a Textron Aviation Authorized Service Facility for current cost and availability of parts listed in this service document. Based on availability and lead times, parts may require advanced scheduling. WARRANTY None Textron Aviation reserves the right to void continued airplane warranty coverage for the parts affected by this service document until the service document is accomplished. NOTE: 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 at www.txtavsupport.com to register. CQB-34-01 October 11, 2022 Page 1 of 1 Textron Aviation Customer Service, P.O. Box 7706, Wichita, KS 67277, U.S.A. 1-316-517-5800 This document contains technical data and is subject to U.S. export regulations. This information has been exported from the United States in accordance with export administration regulations. Diversion contrary to U.S. law is prohibited. ECCN: 9E991 COPYRIGHT © 2022

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