AIRCRAFT
DA 42 NG AMM
Electrical Power
Doc # 7.02.15
Rev. 4
24-31-00
Page 1
15 Mar 2018
Section 24-31
Battery Systems
1. General
This Section tells you about the battery systems for the DA 42 NG airplane. See Section 24-00 and
24-30 for the description and operation of the batteries in the electrical generation system.
The DA 42 NG has these battery systems:
)
A main battery located in the front baggage compartment. This battery provides the usual airplane
electrical services.
)
ECU backup batteries.
2. Main Battery Description and Operation
The main battery is a 24 V, 13.6 Ah sealed battery. A battery tray located on the forward face of the
cockpit bulkhead holds the battery. You can access the battery through the front baggage
compartment, right side after removing the baggage compartment rear cover. A clamp and two bolts
hold the battery in position. The positive and negative cables attach to terminals on the top of the
battery, at the front. The usual rubber caps protect the electrical connections.
When either, or both of the engine alternators are online and the system voltage is greater than the
battery voltage, the system charges the battery.
When either or both alternators are on-line the integrated cockpit system (ICS) display shows each
alternator voltage. When both alternators are offline, the ICS display shows the battery voltage.
The battery supplies current to the RELAY BOX BUS through the battery relay. There is no circuit
protection. The RELAY BOX BUS also supplies power to the LH MAIN BUS, RH MAIN BUS and the
hydraulic pump. Each of the main bus systems are protected by 90 Ampere circuit breakers. The
landing gear extension and retraction system is protected by a 50 Ampere fuse.
The battery also supplies the HOT BUS.
Regular maintenance of the battery system is necessary. Do not wait until a problem occurs.
Summary of Contents for DA 42 NG
Page 933: ...AIRCRAFT DA 42 NG AMM Fuel Doc 7 02 15 Rev 4 28 TITLE Page 1 15 Mar 2018 CHAPTER 28 FUEL ...
Page 1459: ...AIRCRAFT DA 42 NG AMM Lights Doc 7 02 15 Rev 4 33 TITLE Page 1 15 Mar 2018 CHAPTER 33 LIGHTS ...
Page 1711: ...AIRCRAFT DA 42 NG AMM Doors Doc 7 02 15 Rev 4 52 TITLE Page 1 15 Mar 2018 CHAPTER 52 DOORS ...
Page 1853: ...AIRCRAFT DA 42 NG AMM Wings Doc 7 02 15 Rev 4 57 TITLE Page 1 15 Mar 2018 CHAPTER 57 WINGS ...
Page 2071: ...AIRCRAFT DA 42 NG AMM Engine Doc 7 02 15 Rev 4 72 TITLE Page 1 15 Mar 2018 CHAPTER 72 ENGINE ...
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