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Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-CONTENTS Page 7
20 Sep 2007
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
3. Remove/Install the Avionics Master Relay or Essential
Avionics Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
4. Remove/Install a Circuit-Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 203
5. Remove /Install an Instrument Panel Switch . . . . . . . . . . . . . . . . . 204
Section 24-61
DC Electrical Load Distribution - TAE 125 Diesel Engine
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Trouble-Shooting
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Maintenance Practices
1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
2. Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
3. Remove/Install the Avionics Master Relay or Essential
Avionics Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
4. Remove/Install a Circuit-Breaker . . . . . . . . . . . . . . . . . . . . . . . . . 203
5. Remove /Install an Instrument Panel Switch . . . . . . . . . . . . . . . . . 205
6. Remove /Install the ENGINE Switch . . . . . . . . . . . . . . . . . . . . . . . 207
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 8
20 Sep 2007 24-CONTENTS Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-00-00 Page 1
20 Sep 2007
CHAPTER 24
ELECTRICAL POWER
Section 24-00
Electrical Power - Lycoming Engine
1. General
This Section tells you about the electrical system on the airplane with the Lycoming engine installed.
Refer to Section 24-01 for data about the electrical system with the TAE 125 Diesel engine installed.
This Chapter has only simplified schematic diagrams and location diagrams. Refer to Chapter 92 for
the wiring diagrams. Refer to the related Chapter for data about systems. For example, refer to
Chapter 80 for data about the starter system.
The DA 40 has a 28 volt direct current (DC) electrical system. The system has two integral sources
of electrical power and a socket for connecting to an external power source. It has a 28 volt alternator
and it has a 24 volt battery. In the usual operation the alternator supplies the power for the electrical
power system. Refer to Section 24-40 for data on the external power system.
The alternator attaches to the front of the engine. A flexible belt turns the alternator. The alternator
supplies power to the airplane. The power supplied by the alternator is controlled by the voltage
regulator.
The battery is located on the front side of the firewall, on the right side.
An additional emergency battery system is installed in the IFR model (refer to Section 24-32).
An electrical system with essential bus is optional.
Note: Equipment which is certified for installation in the DA 40 is listed in Section 6.5 of
the Airplane Flight Manual. Such equipment may be installed in accordance with
the Airplane Maintenance Manual.
Any equipment which is not listed in Section 6.5 of the Airplane Flight Manual is
called "Additional Equipment". The installation of Additional Equipment is a
modification which must be handled in accordance with national regulations or a
Service Bulletin.
AIRCRAFT
Electrical Power DA 40 Series
AMM
Page 2
20 Sep 2007 24-00-00 Doc # 6.02.01
Rev. 5
VOLTAGE REGULATOR MAIN BUS
ANNUN. AVIONIC BUS
ALT. PROT.
ALT. CONT.
ALT.
ALT
ALTERNATOR CURRENT SENSOR
START
START
BATT
BATT
BATT
EXTERNAL POWER
BATTERY
24 V
11 AMP HRS
STARTER
160 A
ALTERNATOR
28 V / 70 A
OVERVOLTAGE
PROTECTION
AVIONIC
BUS
MASTER CONTROL
AVIONIC
Figure 1: Simplified Schematic Diagram, Electrical System without Essential Bus
AIRCRAFT
DA 40 Series
AMM
Electrical Power
Doc # 6.02.01
Rev. 5 24-00-00 Page 3
20 Sep 2007
Figure 1 shows a simplified schematic diagram of the electrical power system without essential bus.
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