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000º
165
118.000
108.00
n
m
k
t
GTX 327
IDENT FUNC
ON
STBY
OFF
ALT
VFR START
STOP
CRSR
CLR
0
GARM IN
1 2 3 4 5 6 7 8 9
ALT
R
PRESSURE ALT 1200 12300f
t
RPM
LO AD
Oil Pressure Cooling Temp
Oil Temp Ge arb ox Temp
L Fuel Quantity R Fuel Quantity
Water Level
L Fuel Temp ( ºC) R Fuel Temp (ºC)
Amp ere
Fuel F low
Volt
0
IN.Hg
CAL IBRAT ED
T O
2 0,0 0 0 F EE T
m b
28. 7
28.8
975 28.6
970
100FEET
1
2
3
4
5
6
7
8
9
ALT
10 10 10 10 25 5 10 15 2 3
25 10 3 3 5 15 5 3 30 2
3 3 10 5 3
14 VDC ACCESSORY PWR
GROUND OPS. ONLY 2A MAX
Figure 2: Electrical Switches and Circuit-Breakers
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 4
20 Sep 2007 24-61-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-61-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
Make sure that the alternator is supplying power and that there is 14 VDC on the Main Bus. Refer to
Section 24-33. For faults on a piece of equipment, or a system, refer to the applicable Chapter. For
example, for no oil pressure indication, see Chapter 77 Engine Indicating. The table below lists the
defects you could have with the DC load distribution system. If you have the trouble detailed in the
Trouble column, read across to the Possible Cause column. Then do the repair given in the Repair
column.
Trouble Possible Cause Repair
There is 14 VDC on the main
bus but not on the avionic bus.
Avionic master switch set to
OFF.
AV. BUS circuit-breaker not
set.
Avionics master relay
defective.
A failure of the cables which
connect the main bus to the
avionics bus.
Set the avionic master switch
to ON.
Set the AV. BUS circuit
breaker.
Replace the avionics master
relay.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
There is 14 VDC on the
essential bus but not on the
essential avionic bus.
Avionic master switch set to
OFF.
ESS AV. circuit-breaker not
set.
Essential avionics relay
defective.
A failure of the cables which
connect the essential bus to
the essential avionic bus.
Set the avionic master switch
to ON.
Set the ESS AV. circuitbreaker.
Replace the essential avionics
relay.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 102
20 Sep 2007 24-61-00 Doc # 6.02.01
Rev. 5
Trouble Possible Cause Repair
There is 14 VDC on the main
bus but not on the essential
bus with the essential bus
switch set to OFF.
MAIN TIE circuit-breaker not
set.
Set the MAIN TIE circuit
breaker.
ESS TIE circuit-breaker not
set.
Set the ESS TIE circuit
breaker.
Essential tie relay defective. Replace the essential tie relay.
A failure of the cables which
connect the main bus to the
essential tie relay and
essential bus.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
There is 14 VDC on the ECU
bus but not on the main bus
with the essential bus switch
set to OFF.
Power relay defective. Replace the power relay.
5 A power relay fuse failed. Replace the power relay fuse.
A failure of the cables which
connect the ECU bus to the
power relay and main bus.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
A failure of the cables which
connect the power relay coil to
the essential bus switch.
Do a continuity test of the
cables. Refer to Chapter 92 for
the wiring diagrams.
Repair/replace defective
cables.
Essential bus switch
defective.
Replace the essential bus
switch.
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-61-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to remove/install components of the DC load distribution system. Refer to
　
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