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3. Remove/Install the External Power Relay ............................................................. 202
CHAPTER 24-60 DC ELECTRICAL LOAD DISTRIBUTION ................................................................... 1
1. General ...................................................................................................................... 1
2. Description................................................................................................................. 3
3. Operation ................................................................................................................... 3
Trouble-Shooting....................................................................................................................... 101
1. General .................................................................................................................. 101
Maintenance Practices............................................................................................................... 201
1. General .................................................................................................................. 201
2. Electrical Safety ..................................................................................................... 201
3. Remove/Install the Avionic Master Relay .............................................................. 202
4. Remove/Install a Circuit-Breaker........................................................................... 203
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 14 24-00-00 Page 1
30 Oct 2008
CHAPTER 24-00
ELECTRICAL POWER - GENERAL
1. General
NOTE: Throughout this chapter the nomenclatures “generator” and “alternator” are used for the
same component. For DA20-C1 purposes the terms “generator” and “alternator” are
interchangeable in this document.
This Chapter tells you about the electrical system on the airplane. The Chapter has only simplified
schematic diagrams and location diagrams. See Chapter 92 for wiring diagrams. See the related
Chapter for data about systems. For example, see Chapter 80 for data about the starter system.
The DA20-C1 has a 14 volt direct current (DC) electrical system. The system has 2 sources of
electrical power. It has a 14 volt generator. And it has a 12 volt battery. In the usual operation the
generator supplies the power for the system.
The generator attaches to the front of the engine. A flexible belt turns the generator. The generator
has a built-in rectifier and voltage regulator.
The battery position is aft of the baggage compartment in the battery compartment, or battery can
be located on the front left hand side of the firewall.
Electrical Power
DA20-C1 AMM
Page 2
19 Dec 1997 24-00-00 Doc # DA201-C1
Rev. 0
Figure 1 - Simplified Schematic Diagram
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 14 24-00-00 Page 3
30 Oct 2008
Figure 1 shows a simplified schematic diagram of the Electrical Power System. An over-voltage
sensor protects the electrical system from too high a generator voltage. The over-voltage sensor
controls a relay which isolates the generator from the system.
The electrical system has a 12 volt, 20 ampere hour battery. The battery supplies DC to the
electrical system when the generator is not operating. It also supplies power for engine starting.
The battery can also supply power when the load is more than the generator can supply.
The battery supplies heavy current for starting through the battery relay and the starter relay. The
circuit has no protection. Circuit-breakers or fuses protect all other circuits. The GEN/BAT switch
controls all electrical power sources in the system. A main bus and an avionics bus distribute
power to the consumer systems.
The battery relay attaches to the rear of the battery compartment, or the battery relay can be
located on the front left hand side of the firewall.
2. Component Identification
All electrical components are identified in accordance with the ATA 100 specification. For example:
OV2430-02
− OV: Over voltage sensor.
− 24: Chapter 24 Electrical Power
− 30: Section 30 DC Generation
3. Component Location
Figure 2 shows the location of the main components in the electrical power system.
Electrical Power
DA20-C1 AMM
Page 4
29 Apr 2004 24-00-00 Doc # DA201-C1
Rev. 9
A
A
B
B
Battery
Battery Relay
External Power Unit
Relay (Optional)
Over-Voltage Sensor
Warning Light Relay
Avionic Master Relay
Voltage Control Relay
Starter Relay
(See also Chapter 80)
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