ELECTRICAL POWER - ALTERNATOR CONTROL UNIT (ACU) AND CONNECTOR OBSOLESCENCE
CESSNA 172S Skyhawk · Service Bulletins
Overview
This service bulletin addresses the obsolescence of the Alternator Control Unit (ACU) and its connector for various Cessna aircraft models, including the Cessna 172P. It provides instructions and parts required for replacing the ACU with new models (DGR3-5, VR515F-5, and VR515GA-5). Compliance with this bulletin is optional and can be performed at the discretion of the aircraft owner. The document outlines the necessary steps for safely removing the old ACU and installing the new unit, ensuring that all electrical connections are properly handled. It is crucial for mechanics to follow the guidelines to maintain safety and compliance with FAA regulations.
- This service bulletin is applicable to Cessna 172P aircraft with serial numbers 17274010 to 17276673.
- The old ACU can be replaced with DGR3-5, VR515F-5, or VR515GA-5 models.
- Compliance with the bulletin is optional and at the owner's discretion.
- Proper documentation in the aircraft logbook is required after completing the service.
- Safety precautions include grounding the aircraft and disconnecting electrical power before maintenance.
Document
Source
Originally published by www.aircraftspruce.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2024
- Pages
- 10
- File size
- 765 KB
- Publisher
- www.aircraftspruce.com
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In this document
Effectivity
This service bulletin applies to several Cessna models, specifically the Cessna 172P among others. The serial numbers for the 172P range from 17274010 to 17276673.
Compliance
Compliance with this service bulletin is optional. Aircraft owners can choose to replace the ACU at their discretion. Proper documentation in the aircraft logbook is required upon completion.
Accomplishment Instructions
The instructions include preparing the airplane for maintenance, disconnecting electrical power, and removing access panels. The old ACU must be removed, and the new ACU installed according to specified procedures. Wiring modifications are also detailed, including the installation of a new electrical connector.
Material Information
The bulletin lists required parts for the ACU replacement, including the new ACU models (DGR3-5, VR515F-5, VR515GA-5) and associated connectors. It advises contacting a Textron Aviation Authorized Service Facility for parts availability and costs.
Safety Notes
Mechanics must ensure the airplane is electrically grounded and that all switches are in the OFF/NORM position before beginning work. Maintenance warning tags should be used to prevent accidental electrical connections during the procedure.
Safety notes
- Ensure the airplane is electrically grounded before maintenance.
- Use maintenance warning tags to prevent accidental electrical connections.
Full document text
Single Engine SERVICE BULLETIN SEB-24-06 TITLE ELECTRICAL POWER - ALTERNATOR CONTROL UNIT (ACU) AND CONNECTOR OBSOLESCENCE EFFECTIVITY MODEL SERIAL NUMBERS 152 15282032 thru 15286033 A152 A1520809 thru A1521049 F152 F15201529 thru F15201980 FA152 FA1520347 thru FA1520425 172N 17271035 thru 17274009 172P 17274010 thru 17276673 172Q 17275869 thru 17276259 FR172K FR17200631 thru FR17200675 F172N F17201750 thru F17202039 F172P F17202040 thru F17202254 R172K R1722930 thru R1723454 180K 18053001 thru 18053203 182Q 18266591, thru 18267301, 18267303 thru 18267715 R182/TR182 R18200584 thru R18202041 FR182 FR18200026 thru FR18200070 A185F 18503684 thru 18504448 U206G/TU206G T20604650 thru U20607020 207A/T207A 20700483 thru 20700788 210N/T210N 21062955 thru 21064897 210R/T210R 21064898 thru 21065009 P210N P21000151 thru P21000834 P210R P21000835 thru P21000874 NOTE: This service document applies only to customers that are replacing the installed Alternator Control Unit (ACU) with the DGR3-5, VR515F-5, and VR515GA-5 ACU's. REASON The alternator control unit connector is no longer manufactured and replacement is provided. NOTE: This service document applies only to customers that are replacing the installed Alternator Control Unit (ACU) with the DGR3-5, VR515F-5, and VR515GA-5 ACU's. SEB-24-06 July 8, 2024 Page 1 of 8 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 © 2024 SEB-24-06 Page 2 July 8, 2024 Single Engine SERVICE BULLETIN SEB-24-06 DESCRIPTION This service document provides parts and instructions to remove and replace the alternator control unit and replace the airplane connector. COMPLIANCE OPTIONAL. This service kit 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. 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 No specialized consumable materials are required to complete this service document. TOOLING No specialized tooling is required to complete this service document. WEIGHT AND BALANCE INFORMATION Negligible REFERENCES Cessna Model 150 Series (1969-1976) Service Manual Cessna Model 152 Series (1978-1985) Maintenance Manual Cessna Model 172 Skyhawk Series (1969-1976) Service Manual Cessna Model 172 Series (1977-1986) Service Manual Cessna Model 172RG (1980-1985) Service Manual Cessna Model FR172 (1968-1976) Service Manual Single Engine SERVICE BULLETIN SEB-24-06 Cessna Model R172 Series (1977-1981) Service Manual Cessna Model 180 and 185 (1969-1980) Service Manual Cessna Model 180 and 185 Series (1981-1985) Service Manual Cessna Model 182 Series (1969-1976) Service Manual Cessna Model 182 and T182 Series (1977-1986) Maintenance Manual Cessna Model R182/TR182 (1978-1986) Maintenance Manual Cessna Model 206 and T206 Series (1969-1976) Service Manual Cessna Model 206 and T206 Series (1977-1986) Service Manual Cessna Model 207 and T207 Series (1969-1984) Service Manual Cessna Model 210 Centurion Series (1969) Service Manual Cessna Model 210 Centurion Series (1970-1976) Service Manual Cessna Model 210 and T210 Series (1977-1984) Service Manual Cessna Model 210 and T210 Series (1985-1986) Service Manual Cessna Model P210 Series (1978-1983) Service Manual Cessna Model P210 Series (1985-1986) Service Manual PUBLICATIONS AFFECTED None. 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 main 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. NOTE: Use the references that follow for the removal and operational procedures of the Alternator Control Unit (ACU). • Applicable Service / Maintenance Manuals - Section 16, Electrical Systems - Alternator Control Unit. 2. Remove applicable panels/doors to get access to the ACU. (Refer to applicable Service / Maintenance manuals - Section 11 - Engine.) NOTE: The Alternator Control Unit (ACU) is installed on the forward side of the firewall on some models
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or is installed on the aft side of the firewall on other models. 3. Disconnect the Alternator Control Unit (ACU) electrical connector from aircraft electrical connector. 4. (Refer to Figure 1, Sheet 1.) Remove and keep the screw that attaches the grounding strap to the Alternator Control Unit (ACU) and aircraft structure. A. Disconnect the grounding strap. B. Record the installed position of the ground strap. SEB-24-06 July 8, 2024 Page 3 SEB-24-06 Page 4 July 8, 2024 Single Engine SERVICE BULLETIN SEB-24-06 5. Hold the Alternator Control Unit (ACU) and remove the screws that attach the Alternator Control Unit (ACU) to the airplane. A. Keep the screws. B. Remove and discard the Alternator Control Unit (ACU) as per below table. NOTE: Each airplane may have any one of the below ACU P/N. Table 1: Alternator Control Unit OLD ALTERNATOR CONTROL UNIT NEW ALTERNATOR CONTROL UNIT DGR3 DGR3-5 VR515F VR515F-5 VR515GA VR515GA-5 VR515 (Textron P/N C611005-0101) DGR3-5 CSV-2860-1 (Textron P/N C611005-0102) DGR3-5 VR515G (Textron P/N C611005-0103) DGR3-5 6. (Refer to Figure 2, Sheet 1.) Do the wiring modification as follows: A. Tag and identify each wire with the pin number from the 207575-1 Electrical Connector. NOTE: There should be no wire in pin 7. B. Depin the wires from the electrical connector. C. Remove and discard the 207575-1 Electrical Connector from the airplane. D. Re-terminate each wire with 0462-201-20141 Sockets. E. Pin the wires into the pin numbers identified in Step 6.A in the new DTM06-6S Electrical Connector. NOTE: DTM06-6S Electrical Connector only has 6 pins. F. Install the WM-6S Wedge Lock. G. Install 0413-204-2005 Sealing Plug in any unused pins in DTM06-6S Electrical Connector. 7. (Refer to Figure 1, Sheet 1.) Install the new Alternator Control Unit (ACU) as per Table 1 to the airplane with the kept screws. 8. Install the grounding strap to the Alternator Control Unit (ACU) and aircraft structure in the recorded position with the kept screw. NOTE: The installation location of the ground strap may be different for each ACU. The ground strap from the new ACU needs to be installed in the same location when it was removed. 9. Remove the maintenance warning tags and connect the airplane battery. 10. (Refer to Figure 2, Sheet 1.) Connect the Alternator Control Unit (ACU) Electrical Connector to the DTM06-6S Aircraft Electrical Connector. 11. Install the removed access panels/doors. (Refer to applicable Service / Maintenance manuals - Section 11 - Engine.) 12. Do a "Before Takeoff" engine ground run to verify proper operation of the alternator and ACU. (Refer to the Pilot’s Operating Handbook in Section 4 (Normal Procedures) and Section 7 (Systems Description).) NOTE: For DGR3-5 ACU, the low voltage warning light should illuminate at 24.5 ± 0.25 on the ACU for reference. NOTE: For VR515GA-5 and VR515F-5 ACU, the low voltage warning light should illuminate at 24.5 ± 0.5 on the ACU for reference. Single Engine SERVICE BULLETIN SEB-24-06 13. Make an entry in the airplane logbook that states compliance and method of compliance with this service document. SEB-24-06 July 8, 2024 Page 5 SEB-24-06 Page 6 July 8, 2024 Single Engine SERVICE BULLETIN SEB-24-06 Figure 1. ACU Installation (Sheet 1) Single Engine SERVICE BULLETIN SEB-24-06 Figure 2. ACU Wiring Changes (Sheet 1) SEB-24-06 July 8, 2024 Page 7 SEB-24-06 Page 8 July 8, 2024 Single Engine SERVICE BULLETIN SEB-24-06 MATERIAL INFORMATION The parts below may be required to complete this service bulletin. NEW P/N QUANTITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION 0413-204-2005 As Required Sealing Plug N/A Install 0462-201-20141 6 Socket N/A Install DGR3-5 VR515F-5 VR515GA-5 1 Alternator Control Unit DGR3 VR515F VR515GA Discard old, Install new. DTM06-6S 1 Electrical Connector 207575-1 Discard old, Install new. WM-6S 1 Wedge Lock N/A Install * Please contact a Textron Aviation Authorized Service Facility for current cost and availability of parts listed in this service document. For more information, please visit the TAPD Support & Aftermarket Account Management website at https://ww2.txtav.com/Parts/Promos/TAPD. Based on availability and lead times, parts may require advanced scheduling. Single Engine OWNER ADVISORY SEB-24-06 TITLE ELECTRICAL POWER - ALTERNATOR CONTROL UNIT (ACU) AND CONNECTOR OBSOLESCENCE TO: Cessna Models 152, A152, F152, FA152, 172N, 172P, 172Q, FR172K, F172N, F172P, R172K, 180K, 182Q, R182/TR182, FR182, A185F, U206G/TU206G, 207A/T207A, 210N/T210N, 210R/T210R, P210N, P210R Aircraft Owners REASON The alternator control unit connector is no longer manufactured and replacement is provided. NOTE: This service document applies only to customers that is replacing the installed Alternator Control Unit (ACU) with the DGR3-5, VR515F-5, and VR515GA-5 ACU's. COMPLIANCE OPTIONAL. This service kit can be accomplished at the discretion of the owner. LABOR HOURS For planning purposes only: WORK PHASE LABOR-HOURS Modification As Necessary Test and Inspection As Necessary MATERIAL AVAILABILITY PART NUMBER AVAILABILITY COST 0413-204-2005 * * 0462-201-20141 * * DGR3-5 VR515F-5 VR515GA-5 * * DTM06-6S * * WM-6S * * * Please contact a Textron Aviation Authorized Service Facility for current cost and availability of parts listed in this service document. For more information, please visit the TAPD Support & Aftermarket Account Management website at https://ww2.txtav.com/Parts/Promos/TAPD. Based on availability and lead times, parts may require advanced scheduling. SEB-24-06 July 8, 2024 Page 1 of 2 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 © 2024 SEB-24-06 Page 2 July 8, 2024 Single Engine OWNER ADVISORY SEB-24-06 WARRANTY None. 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 support.txtav to register.