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# Supplement Airplane Maintenance Manual Cessna 172 & Reims F172 TAE 125-01
Doc. No.: AMM-20-01 (US-Version) Version: 2/4 Tel. +49-(0)37204/ 696-0 Fax +49-(0)37204/ 696-2912 www.centurion-engines.com support@centurion-engines.com



## CAUTION: This Supplement to the Airplane Maintenance Manual must be read completely before maintenance action, as it contains important safety information.

 

## Note: The Supplement to the Airplane Maintenance Manual is to be included at every Cessna 172 and Reims F172 with TAE 125-01 installation  

## CAUTION: The organizations and staff who carry out these maintenance action must be approved by the authority, with the exception of the “Pre-flight check“

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 1 6 4 08.10.2010 

## Table of Contents

0.1 LIST OF REVISIONS ....... ..........................................................5 0.2 LIST OF APPLICABLE CHAPTERS .....

............................ .........6

1 INTRODUCTION........................................................................1 1.1 ACCOMPANYING APPL ICABLE DOCUMENTS ....

........... .......1 1.2 IDENTIFICATION OF PARTS OF TAE 125-01 INSTALLATION................ ..........................................................2 1.3 COPYRIGHT © ............. .............................................................4 1.4 CONVENTIONS IN THIS MANUAL ......

............................ .........4 1.5 VALIDITY OF THIS MANUAL .......... ..........................................4 1.6 ABBREVIATIONS ............ ..........................................................5 1.7 PACKING AND TRANSPORT ..............

............................ .........5 1.8 STORAGE..........................................

............... .........................5 1.9 QUALIFICATIONS OF THE OPERATING AND MAINTENANCE PERSONNEL .............. ...............................................................5 1.10 UPDATE INFORMATION SERVICE.....

............................ .........5 1.11 SERVICE LIFE OF THE ENGINE......

............... .........................5 1.12 CONVERSION FACTORS...

.............. ............... .........................6

4 AIRWORTHINESS LIMITATIONS, INITIAL ISSU E ..................1 4.1 ENGINE LIFE LIMIT...... .............................................................1 4.2 MANDATORY MAINTENANCE ACTION S ................ ................1 4.3 LOG OF REVISIONS TO AI RWORTHINESS LIMITATIONS ....2

5 TIME LIMITS / MAINTENANCE CHEC KS ................ ................1 5.10 TIME LIMITS ............... ...............................................................2 5.20 SCHEDULED MAINTENANCE CHECKS. .................................2 5.50 UNSCHEDULED MAINTENANCE..........

.............. .....................5

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 2 6 Revision no.: Revision date: 4 08.10.2010 6 DIMENSIONS AND AREAS ...

.......................................... .........1 6.1 MODEL ................

.............................. ............... .........................1 6.2 ENGINE .............................................

............... .........................1 6.3 PROPELLER..........

............................ ............... .........................2 6.4 FUEL SYSTEM ................ ..........................................................2

12 SERVICING ...........

............................ ............... .........................1 12.00 GENERAL ............

.............................. ............... .........................1 12.10 REPLENISHING ....

............................ ............... .........................2 12.20 SCHEDULED SERVICING ..

.............. ............... .........................5

20 STANDARD PRACTICES - AIRFRAME .. .................................1 20.00 GENERAL ............

.............................. ............... .........................1

21 ENVIRONMENTAL SYSTEMS..

........................... .....................1 21.00 GENERAL ............

.............................. ............... .........................1

24 ELECTRICAL POWER........

.............. ............... .........................1 24.00 GENERAL ............

.............................. ............... .........................1 24.30 DC GENERATION ........... ..........................................................2 24.50 ELECTRICAL LOAD DISTRIBUTION...

............................ .........7

28 FUEL............. .............................................................................1 28.00 GENERAL ............

.............................. ............... .........................1 28.20 DISTRIBUTION............. .............................................................2 28.40 INDICATING

............... .............................................................10

31 INDICATING / RECORDING SYSTEMS .. .................................1 31.50 CENTRAL WARNING SYSTEMS.........

............................ .........1 31.60 INDICATING INSTRUMENTS

............... .............. .....................2

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 3 6 4 08.10.2010 37 VACUUM ...............

............................ ............... .........................1 37.00 GENERAL ............

.............................. ............... .........................1

61 PROPELLER .........

............................ ............... .........................1 61.10 CONSTANT SPEED PROP ELLER........... .................................1 61.20 CONSTANT SPEED UNIT............... ..........................................2

71 POWER PLANT............... ..........................................................1 71.00 GENERAL ............

.............................. ............... .........................1 71.20 MOUNTS.............. ....................................................................32 71.40 ATTACH FITTINGS ......... ........................................................34 71.60 AIR INTAKES ............. .............................................................36

73 ENGINE FUEL SYSTEM ....

............... ............... .........................1 73.00 GENERAL ............

.............................. ............... .........................1

74 IGNITION .............

.............................. ............... .........................1 74.00 GENERAL ............

.............................. ............... .........................1

77 ENGINE INDICATION .......

................ ............... .........................1 77.00 GENERAL ............

.............................. ............... .........................1

78 EXHAUST ..............

............................ ............... .........................1 78.00 GENERAL ............

.............................. ............... .........................1

79 OIL .................. ...........................................................................1 79.00 GENERAL ............

.............................. ............... .........................1 79.30 INDICATING

............... ...............................................................4

80 STARTING.............

............................ ............... .........................1 80.00 GENERAL ............

.............................. ............... .........................1

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 4 6 Revision no.: Revision date: 4 08.10.2010 91 CHARTS AND WIRING DI AGRAMS .......... ..............................1 91.10 WIRING DIAGRAMS........ ..........................................................1 91.20 SPECIAL TOOLS.............

.......................................................... 5

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 5 6 4 08.10.2010 

## 0.1 LIST OF REVISIONS
Chapter Issue/Revision Date Approved by 20-AMM-00-01-US 1/1 01.09.2006 Bollen 20-AMM-05-01-US 1/1 01.09.2006 Bollen 20-AMM-06-01-US 2/2 01.09.2006 Bollen 20-AMM-28-01-US 2/3 01.09.2006 Bollen 20-AMM-61-01-US 2/2 01.09.2006 Bollen 20-AMM-71-01-US 2/2 01.09.2006 Bollen 20-AMM-91-01-US 2/3 01.09.2006 Bollen 20-AMM-00-01-US 2/4 08.10.2010 van den Bosch 20-AMM-01-01-US 2/2 08.10.2010 van den Bosch 20-AMM-04-01-US 2/0 08.10.2010 van den Bosch 20-AMM-05-01-US 2/0 08.10.2010 van den Bosch 20-AMM-06-01-US 2/3 08.10.2010 van den Bosch 20-AMM-12-01-US 2/2 08.10.2010 van den Bosch 20-AMM-20-01-US 2/0 08.10.2010 van den Bosch 20-AMM-21-01-US 2/2 08.10.2010 van den Bosch 20-AMM-24-01-US 2/2 08.10.2010 van den Bosch 20-AMM-28-01-US 2/4 08.10.2010 van den Bosch 20-AMM-31-01-US 2/2 08.10.2010 van den Bosch 20-AMM-61-01-US 2/3 08.10.2010 van den Bosch 20-AMM-71-01-US 2/3 08.10.2010 van den Bosch 20-AMM-79-01-US 2/2 08.10.2010 van den Bosch 20-AMM-91-01-US 2/4 08.10.2010 van den Bosch

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-00-01-US 2 02.06.2004 6 6 Revision no.: Revision date: 4 08.10.2010 

## 0.2 LIST OF APPLICABLE CHAPTERS
Chapter Issue/Revision Date 20-AMM-00-01-US 2/4 08.10.2010 20-AMM-01-01-US 2/2 08.10.2010 20-AMM-04-01-US 2/0 08.10.2010 20-AMM-05-01-US 2/0 08.10.2010 20-AMM-06-01-US 2/3 08.10.2010 20-AMM-12-01-US 2/2 08.10.2010 20-AMM-20-01-US 2/0 08.10.2010 20-AMM-21-01-US 2/2 08.10.2010 20-AMM-24-01-US 2/2 08.10.2010 20-AMM-28-01-US 2/4 08.10.2010 20-AMM-31-01-US 2/2 08.10.2010 20-AMM-37-01-US 2/1 22.11.2004 20-AMM-61-01-US 2/3 08.10.2010 20-AMM-71-01-US 2/3 08.10.2010 20-AMM-73-01-US 2/1 22.11.2004 20-AMM-74-01-US 2/1 22.11.2004 20-AMM-77-01-US 2/1 22.11.2004 20-AMM-78-01-US 2/1 22.11.2004 20-AMM-79-01-US 2/2 08.10.2010 20-AMM-80-01-US 2/1 22.11.2004 20-AMM-91-01-US 2/4 08.10.2010

Prepared by: Checked by Released by:

S. Braun M. Steinberg, MPI R. van den Bosch, MPL

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 1 16 2 08.10.2010 

## 24 ELECTRICAL POWER
24.00 GENERAL
DESCRIPTION AND OPERATION For Cessna 172 with TAE 125-01 installation there are two electrical system variants possible:



## • 14 Volt or



## • 28 Volt The 14 V system is equipped with a 90 am p alternator, a 14 V starter, a 12 V battery and an excitation battery for the alternator. The 28 V system is equipped with a 60 am p alternator, a 28 V starter, a 24 V battery and an excitation battery for th e alternator. The alternator and the battery are operated by a separate rocker switch (BAT and ALT) located on the instrument panel. The excitation battery of the alternator is operated with the BAT switch simultaneously. A warning light (ALT WRNGLT) on the TAE-lightpanel will illuminate if the alternator fails to produce current, accompanied by a zero indication on the AED-125. The battery switch (BAT) must be ON before any electrical equipment will operate. In addition to the main battery and alternator, a backup battery which only supplies power to FADEC-A is part of the electrical system when installed. The FADEC backup battery is integrated into the electrical system without manual control. The pilot can not manually switch the FADEC backup battery on or off. Under normal operating conditions when the alternator voltage is greater than the battery vo ltage, the alternator charges the battery. In the event of an alternator failure and a depleted or failed main Battery, the FADEC backup battery is the only power source and will automatically supply power to FADEC A. This prevents the engine from stopping in the unlikely event of interrupted power supply from both alternator and main battery.

For wiring diagrams of the electrical systems of TAE 125- 01 installations refer to Chapter 91, Sectio n 91.10 of this supplement. S WARNING: When operating on FADEC backup battery only, the "Force B" switch must not be activated. This will shut down the engine.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 2 16 Revision no.: Revision date: 2 08.10.2010 

## 24.30 DC GENERATION
PRECAUTIONS The following precautions must be observed when testing the electrical system.
S WARNING: Failure to observe t hese precautions will result in serious dam age to the electrical equipment !

 CAUTION: Refer to wiring diagram in Chapter 91, Section 91.10 when install-ing or testing alternator.

 CAUTION: Disconnect battery, excitation battery and backup battery before connecting or disconnecting test instruments (except voltmeter), or before removing or replacing any unit or wiring. Accidental grounding or shorting at alternator with internal regulator (14V version only), alte rnator without internal regulator (28V versi on only), regulator (28V version only), excitation battery, ammeter or accessories, will cause severe damage to units and/or wiring.

 CAUTION: Disconnect main battery before connecting or disconnecting the excitation or backup battery! The excitation battery wire from the alternator (14V version)or from the regulator (28V version) may carry electrical power even without connected excitation battery in case the main battery isstill connected to the system.

 CAUTION: Grounding th e alternator out put terminal will damage alternator and/or circuit and components !

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 3 16 2 08.10.2010 

### TROUBLESHOOTING

Table 24-1a Troubleshooting TAE 125-01 DC Generation  CAUTION: Reversed battery connections will damage rectifiers, wiring, regul ator and other charging system components ! Battery polarity must be checked with a voltmeter before connecting battery. The aircraft is negative ground.

 CAUTION: If booster battery or fast charger is used, its polarity must be connected correctly to prevent damage to electrical system components !

Trouble Check Corrective Action Check alternator wiring Replace alternator wiring Check alternator fuse Replace alternator fuse Check alternator relay Replace alternator relay Check alternator switch Replace alternator switch Check alternator funcion Replace alternator Check excitation battery Replace excitation battery Check excitation battery wiring Repair wiring FADEC backup battery capacity low Replace Battery
FADEC backup battery defect Replace Battery FADEC backup battery system wiring defective Do a test of the FADEC backup battery system wiring Refer to chapter 91 for the wiring diagrams Lack of alternator current

Alternator does not work correctly without main battery connected and switched on FADEC backup battery functioning test negative

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 4 16 Revision no.: Revision date: 2 08.10.2010 

### MAINTENANCE PRACTICES
1. General These maintenance practice s provide instructions to



## • inspect the main battery



## • replace the main battery



## • replace the exci tation battery



## • Functioning check of th e FADEC backup battery



## • replace the FADEC backup battery(if installed per TM TAE 601-0007) 2. Inspecting the Main or FADEC backup battery



## • Visually inspect the battery fo r signs of damage, leaks and corrosion. Refer to the battery manufacturer’s specifications (refer to 01.1).



## • Check for incorrect mounting.



## • Check the terminal connections. 3. Disconnecting/Connecting the Main Battery for Maintenance A. Disconnect the Main Battery for Maintenance (1) Remove the bottom of the extended baggage area. Refer to the airplane manufact uerer ́s specifications. (2) Remove the cover from the battery box. (3) Disconnect the negative ca ble from the main battery. See Fig. 24-1a.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 5 16 2 08.10.2010 Fig. 24-1a Main Battery 1 Main battery 2 Negative cable 3 Battery box (4) Disconnect the positive ca ble from the main battery. B. Connect the Main Battery after Maintenance (1) Connect the positive cable to the main battery

(2) Connect the negative cable to the main battery. (3) Install the cover to the battery box (4) Install the bottom of t he extended baggage area. Refer to the airplane manufacture r ́s specifications. 4. Replacing the Main Battery A. Remove the Main Battery (1) Remove the bottom of the extended baggage area. Refer to the airplane manufact uerer ́s specifications. (2) Remove the cover from the battery box. (3) Disconnect the negative ca ble from the main battery. See Fig. 24-1a. (4) Disconnect the positive ca ble from the main battery. (5) Remove the main battery from the airplane.  CAUTION: Make sure that you connect the cables to the correct terminals ! Inco rrect connection can damage the electrical and avionic systems.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 6 16 Revision no.: Revision date: 2 08.10.2010 B. Install the new Main Battery in the Airplane (1) Make sure that the main battery is dry and clean (2) Place the main battery in to position in the battery box (3) Connect the positive cable to the main battery

(4) Connect the negative cable to the main battery. (5) Install the cover to the battery box (6) Install the bottom of t he extended baggage area. Refer to the airplane manufacture r ́s specifications.  CAUTION: Make sure that you connect the cables to the correct terminals ! Inco rrect connection can damage the electrical and avionic systems.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 7 16 2 08.10.2010 5. Replacing the Excitation Battery A. Remove the Excitation Battery (1) Disconnect the main battery. Refer to 3, Disconnect /Connect the Main Battery for Maintenance. (2) Disconnect the negative cable from the excitation battery. (3) Disconnect the positive cable from the excitation battery. (4) Remove the battery carrier (top) (5) Remove the excitation battery from the airplane. B. Install the new Excitation Battery (1) Place the excitation battery into position in the battery carrier (bottom). (2) Install the battery carrier (top) (3) Connect the positive cable tothe excitation battery (4) Connect the negative cable tothe excitation battery (5) Connect the main battery. Refer to 3, Disconnect / Connect the Ma in Battery for Maintenance. (6) Do an engine ground run. Refer to OM-02-01. The Alternator Warning La mp (AWL) must go OFF. 6. Functioning check of th e FADEC backup battery (1) Start engine in accordance with TAE POH supplement (2) Turn off all avionics (3) FADEC Backup Battery Test a) Alternator Switch - O FF, engine must operate normally b) Battery Switch - OFF, engi ne must operate normally, FADEC Battery test successfull c) Battery Switch - ON d) Alternator Switch - ON (4) Ammeter - Check positive change, al ternator warning light must be OFF (5) Voltmeter - Check in green range (6) Shut down engine

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 8 16 Revision no.: Revision date: 2 08.10.2010 7. Replacing the FADEC Backup Battery A. Remove the Backup Battery (1) Disconnect the main battery. Refer to 3, Disconnect / Connect the Ma in Battery for Maintenance. (2) Disconnect the negative cable from the black backup battery terminal. (3) For 28V system only: disconnect the cable which interconnects the two batteries. (4) Disconnect the positive cable from the red backup battery terminal. (5) Remove the battery carrier (top) (6) Remove the backup batte ry from the airplane. B. Install the new Backup Battery

(1) Place the backup battery intoposition in th e battery carrier (bottom). (2) Install the battery carrier (top) (3) Connect cable TF-06-B-10 tobackup battery positive connection (red terminal). (4) For 28V systems only: in terconnect the 2 backup batteries with each other using cable TF-06-C-10 (5) Connect cable TF-06-N-10 to backup battery negative connection (black terminal) (6) Check if plug-in connection on backup battery is fitted tightly! (7) Connect the main battery. Refer to 3, Disconnect / Connect the Ma in Battery for Maintenance. (8) Perform functioning check of the FADEC backup battery.  Note: Charge the battery i.a.w. the manufacturers instruction before instal lation into the aircraft.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 9 16 2 08.10.2010 

## 24.50 ELECTRICAL LOAD DISTRIBUTION
TROUBLESHOOTING For Troubleshooting in case of malfunction refer to refer to Chapter 71 

### MAINTENANCE PRACTICES
1. General These maintenance practices prov ide instructions to inspect



## • all relays



## • all 14V/28V converters, if installed They also provide instructions to accomplish a function test of the following parts:



## • all relays



## • all switches



## • all circuit breakers



## • all 14V/28V converters, if installed 2. Inspecting the relays This is a visual inspection. Ins pect whether the connections of the relays are firmly attached. In addition, the relays have to be checked for signs of corrosion. The following relays have to be checked:



## • Battery Relay (located in the Junction-Box on the firewall)



## • Alternator Relay (located in the Junction-Box on the firewall)



## • Glow Relay (located in the Junction-Box on the firewall)



## • Main Bus Relay, only C172 K,L, M,N,P (located on the LH of the airframe, underneat h the Panel LH) 3. Inspecting the 14V/28V C onverters, if installed This is ab visual inspection. Ins pect whether the connections of the 14V/28V are firmly attached. In addition, the 14V/28V converters has to be checked for signs of corrosion.

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 10 16 Revision no.: Revision date: 2 08.10.2010 4. Accomplishing a function test of all relays The following relays must be tested:



## • Battery Relay (located in the Junction-Box on the firewall)



## • Alternator Relay (located in the Junction-Box on the firewall)



## • Glow Relay (located in the Junction-Box on the firewall)



## • Main Bus Relay, only C172 K,L, M,N,P (located on the LH of the airframe, underneat h the Panel LH) A. Accomplish the function test of the Battery Relay (1) Battery Switch “ON“ (2) AED, CED illuminate (without data) (3) Fuel Pump functional(switch Fuel Pump) (4) => Battery Relay OK (5) Battery Switch “OFF“ B. Accomplish the function testof the Alternator Relay (1) Battery Switch “ON“ (2) Alternator Switch “ON“ (3) A voltmeter must indicatethe same voltage at the Alternator (Terminal Wire3) as at the battery (4) Alternator Switch “OFF“: No voltage at the Alternator (Terminal Wire 3) (5) => Alternator Relay OK (6) Battery Switch “OFF“ C. Accomplish the function test of the Glow Relay (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Voltage at the Glow Plugs , Glow Lamp “ON“ (approx. 5sec.) (4) => Glow Relay OK (5) Engine Master “OFF“ (6) Battery Switch “OFF“

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 11 16 2 08.10.2010 D. Accomplish the function test of the Main Bus Relay (1) Battery Switch “ON“ (2) Main Bus Switch “ON“ (3) Avionics, Lights etc. functional (4) => Main Bus Relay OK (5) Main Bus Switch “OFF“ (6) Battery Switch “OFF“ 5. Accomplishing a function test of all switches/knobs The following switches must be tested:



## • Main Bus Switch



## • Engine Master Switch



## • Force B Switch



## • FADEC Test Knob



## • AED/CED Test Knob



## • Alternator switch

A. Inspect all switches/knobs (1) Visual inspect all switches/knobs on signs of corrosion (2) Visual inspect whether all connections of the switches/ knobs are firmly attached B. Accomplish the function test of the Main Bus Switch (1) Battery Switch “ON“ (2) Main Bus Switch “ON“ (3) Main Bus Relay on, Avi onics, Lights etc. functional (4) => Main Bus Switch OK (5) Main Bus Switch “OFF“ (6) Battery Switch “OFF“ S WARNING: Only run the engine on the ground with the propeller running, even for testing purposes, in a safe and clear area and ensure that prop area is clear !

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 12 16 Revision no.: Revision date: 2 08.10.2010 C. Accomplish the function testof the Engine Master Switch (1) Battery Switch “ON“ (2) Engine Master “ON“ => AED/CED indicate data (3) Start engine

(4) Load Selector “IDLE“ (5) Accomplish FADEC Test procedure => OK (6) Battery Switch “OFF“ => Engine must run without Battery (7) Switch FADEC A to FADEC B using the Force B switch => Engine running OK (8) => Engine Ma ster Switch OK (9) Engine Master “OFF“ (10) Battery Switch “OFF“ D. Accomplish the function test of the Force B Switch (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Start engine

(4) Load Selector “IDLE“ (5) FADEC toggles from FADE C A to FADEC B using the Force B switch (6) => Force B switch OK (7) Engine Master “OFF“ (8) Battery Switch “OFF“ S WARNING: Only run the engine on the ground with the propeller running, even for testing purposes, in a safe and clear area and ensure that prop area is clear !

S WARNING: Only run the engine on the ground with the propeller running, even for testing purposes, in a safe and clear area and ensure that prop area is clear !

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 13 16 2 08.10.2010 E. Accomplish the function test of the FADEC Test Knob (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Start engine

(4) Load Selector “IDLE“ (5) Push FADEC test knob=> Test procedure OK (6) => FADEC Test knob OK (7) Engine Master “OFF“ (8) Battery Switch “OFF“ F. Accomplish the function testof the AED/CED Test Knob (1) Battery Switch “ON“ (2) Push AED/CED test knob => Selftest AED/CED OK (3) => AED/CED Test Knob OK (4) Battery Switch “OFF“ G. Accomplish the function testof the Alternator Switch (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Start engine

(4) Load Selector “IDLE“ (5) Alternator Switch on: Load current (AED), Voltage > 14V (AED), Alternator Wa rning Lamp (AWL) off (6) Alternator Switch off: Noload current, Voltage <14V, Alternator Warning Lamp on (7) => Alternator OK (8) Engine Master “OFF“ (9) Battery Switch “OFF“ S WARNING: Only run the engine on the ground with the propeller running, even for testing purposes, in a safe and clear area and ensure that prop area is clear !

S WARNING: Only run the engine on the ground with the propeller running, even for testing purposes, in a safe and clear area and ensure that prop area is clear !

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 14 16 Revision no.: Revision date: 2 08.10.2010 6. Accomplishing a function test of all Circuit Breakers The following circuit breakers must be tested:



## • FADEC A/B



## • AED/CED



## • Starter A. Accomplish the function test of the Circuit Breaker FADEC A/B (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Establish CAN communicati on by connecting the computer to the airplane (4) Switch FADEC A/B via Circuit Breaker (5) => Circuit Breaker FADEC A/B OK (6) Remove CAN communiction (7) Engine Master “OFF“ (8) Battery Switch “OFF“ B. Accomplish the function testof the Circuit Breaker AED/ CED (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Switch AED/CED via Ci rcuit Breaker AED/CED (4) => Circuit Beaker AED/CED OK (5) Engine Master “OFF“ (6) Battery Switch “OFF“ C. Accomplish the function test of the Circuit Breaker Starter (1) Battery Switch “ON“ (2) Engine Master “ON“ (3) Switch Starter via Ci rcuit Breaker Starter (4) => Circuit Breaker Starter OK (5) Engine Master “OFF“ (6) Battery Switch “OFF“

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Revision no.: Revision date: Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 15 16 2 08.10.2010 7. Accomplishing a function test of all 14V/28V converters, if installed A. Accomplish the function testof all 14V/28V converters (1) Battery Switch “ON“ (2) Main Bus Switch “ON“ (3) Consumer of electricity “ON“ (check under Load) (4) Check Voltage, a voltmeter must indicate the transformed voltage (refer to the 14/28V Converter manufacturer) (5) => 14V/28V Converters OK (6) Main Bus Switch “OFF“ (7) Battery Switch “OFF“

## Supplement Airplane Maintenance Manual Cessna C 172 / TAE 125-01

AMM-20-01 (US-Version)

Chapter: Issue: Issue date: Page: Content: 20-AMM-24-01-US 2 02.06.2004 16 16 Revision no.: Revision date: 2 08.10.2010 This page intentio nally left blank