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.005 ohms or less. Use a
calibrated digital volt ohm
meter for measurments
CAUTION
Only those familiar with
saf e t y p r a c t i ces whi l e
working on live electrical
circuits should do so. Injury
or damage to equipment
may result otherwise.
Select batt. to off
Flow-Chart Sheet 2
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-60-00 Page 201
19 Dec 1997
MAINTENANCE PRACTICES
1. General
This part gives you the data to remove/install and adjust/test the components of the DC electrical
distribution system on the airplane. See the component manufacturer’s manuals for more data and
shop data.
2. Electrical Safety
The DA20-C1 has a low-voltage DC electrical system. When correctly maintained it is safe to work
on. But the battery can supply heavy current through low-resistance circuits (for example, if you
ground the positive output with a wrench by accident).
Always follow the usual safety practices for working on electrical equipment. Allow only qualified
persons to maintain the electrical system.
CAUTION: DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON
THE ELECTRICAL SYSTEM. MAKE SURE YOU DISCONNECT THE
NEGATIVE LEAD FIRST.
CAUTION: AFTER DOING ELECTRICAL MAINTENANCE DO A CONFIDENCE
TEST OF THE SYSTEM WITH A 14 VOLT POWER SUPPLY THAT HAS
OVER-CURRENT PROTECTION. DO THIS BEFORE CONNECTING
THE BATTERY
CAUTION: USE ONLY DA20-C1 SPARE PARTS APPROVED BY THE
MANUFACTURER.
Electrical Power
DA20-C1 AMM
Page 202
19 Dec 1997 24-60-00 Doc # DA201-C1
Rev. 0
3. Remove/Install the Avionic Master Relay
A. Remove the Avionic Master Relay
Detail Steps/Work Items Key Items
(1) Disconnect the battery. Disconnect the negative cable first.
(2) Remove the instrument panel cover. Refer to Chapter 25-10.
(3) Disconnect the control and power wires from
the avionic master relay.
(4) Release the bolt which attaches the avionic
master relay to the instrument panel shelf.
(5) Remove the relay.
B. Install the Avionic Master Relay
Detail Steps/Work Items Key Items
(1) Put the avionic master relay in position on
the instrument panel shelf.
(2) Install the attaching bolt.
(3) Connect the control and power wires to the
avionic master relay.
Refer to Chapter 92 for wiring diagrams.
Obey the numbering and terminal layout
placard on the relay.
(4) Connect the battery. Connect the positive cable first.
(5) Do a test of the avionic master relay.
(6) Install the instrument panel cover. Refer to Chapter 25-10.
C. Avionic Master Relay Functional Test
Detail Steps/Work Items Key Items
(1) Set the GEN/BAT switch to ON.
(2) Set the radios ON.
(3) Set the AVIONIC MASTER switch to ON. The radios must operate.
(4) Set the AVIONIC MASTER switch to OFF.
(5) Pull the AVIONIC MASTER CTRL. Circuitbreaker.
The radios must operate.
(6) Set the GEN/BAT switch to OFF.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-60-00 Page 203
19 Dec 1997
4. Remove/Install a Circuit-Breaker
A. Remove a Circuit-Breaker
Detail Steps/Work Items Key Items
(1) Disconnect the battery. Disconnect the negative cable first.
(2) Remove the instrument panel cover. Refer to Chapter 25-10.
(3) Disconnect the wires from the circuitbreaker.
(4) Remove the screw from the copper bus-bar.
(5) Remove the attaching nut.
(6) Remove the circuit-breaker.
B. Install a Circuit-Breaker
Detail Steps/Work Items Key Items
(1) Put the circuit-breaker in position in the
instrument panel.
(2) Install the attaching nut.
(3) Install the screw in the copper bus-bar
(4) Connect the wires to circuit-breaker. Refer to Chapter 92 for wiring diagrams.
(5) Connect the battery. Connect the positive cable first.
(6) Do a functional test of the circuit-breaker.
(7) Install the instrument panel cover. Refer to Chapter 25-10.
C. Circuit-Breaker Functional Test
Detail Steps/Work Items Key Items
(1) Set the GEN/BAT switch to ON.
(2) Operate the related system. Apply the full electrical load to the system.
(3) Pull the circuit-breaker. The system must stop operating. Make
sure there is no power to the system.
(4) Close the circuit-breaker.
(5) Set the GEN/BAT switch to OFF.
Electrical Power
DA20-C1 AMM
Page 204
19 Dec 1997 24-60-00 Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Equipment/Furnishings
Doc # DA201-C1
Rev. 0 25-TITLE Page 1
19 Dec 1997
CHAPTER 25
EQUIPMENT/FURNISHINGS
Equipment/Furnishings
　
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