AIRCRAFT
DA 42 NG AMM
Electrical Power
Doc # 7.02.15
Rev. 4
24-30-00
Page 201
15 Mar 2018
Maintenance Practices
1. General
This Section tells you how to replace components of the 28 V DC electrical generation system on the
airplane. Refer to the components manufacturers’ manuals for more data and for shop data.
2. Electrical Safety
The DA 42 NG has a low voltage DC electrical system. When correctly maintained it is safe to do work
on. The battery can supply heavy current through low resistance circuits (for example, if you ground
the battery positive 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 BATTERIES (MAIN AND ECU BACKUP) BEFORE
YOU DO ANY WORK ON THE ELECTRICAL SYSTEM. MAKE SURE
THAT YOU DISCONNECT THE NEGATIVE LEAD FIRST.
CAUTION:
AFTER DOING ELECTRICAL MAINTENANCE ALWAYS DO A
CONFIDENCE TEST OF THE SYSTEM WITH A 24 VOLT POWER
SUPPLY THAT HAS OVER-CURRENT PROTECTION. DO THIS
BEFORE CONNECTING THE BATTERY.
CAUTION:
WHEN OPERATING THE AIRPLANE ELECTRICAL SYSTEM WITH
ENGINE MASTER ON (LH OR RH) AND THE ENGINE IS NOT RUNNING
(e.g. EVENT LOG READOUT) ALWAYS CONNECT AN EXTERNAL
POWER SUPPLY WITH A PRESET VOLTAGE OF 29 V TO THE
AIRPLANE. OTHERWISE THE ALTERNATORS MAY BE DAMAGED.
ADDITIONALLY, IF MÄM 42-551 IS INSTALLED, SWITCH OFF BOTH
(LH AND RH) ALTERNATOR SWITCHES.
CAUTION:
USE ONLY DA 42 NG SPARE PARTS APPROVED BY THE
MANUFACTURER.
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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