Supplement Airplane Maintenance Manual
Cessna 172 with TAE 125-02-99 / -114
AMM-20-02
Rev. No:
Rev. Date:
Chapter:
Issue:
Issue Date:
Page:
Content:
20-AMM-24-02
3
06.11.2013
9
16
1
25.08.2014
24.50 ELECTRICAL LOAD DISTRIBUTION
TROUBLESHOOTING
For Troubleshooting in case of malfunction refer to Chapter 71.
MAINTENANCE PRACTICES
1. General
These maintenance practices provide 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. Inspect whether the connections
of the relays are firmly attached. In addition, the relays have
to be checked for signs of corrosion.
Depending on installation, inspect the following relays:
• 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 F,G,H,I,K,L,M,N,P
(located on the LH of the airframe, underneath the
Panel LH)
3. Inspecting the 14V/28V Converters, if installed
This is a visual inspection. Inspect whether the connections
of the 14V/28V are firmly attached. In addition, the 14V/28V
converters has to be checked for signs of corrosion.
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