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DA 42 NG AMM
1. General
This Chapter tells you about the air conditioning system for the DA 42 NG. It gives you a description
of the system and operation. It also provides information on trouble-shooting and tells you how to
remove and install the main components of the air conditioning system.
If OÄM 42-193 is carried out, a recirculating air - cabin cooling (RACC) system is installed. Refer to
Section 21-50 (if OÄM 42-193/c or earlier is installed) or Section 21-51 (if OÄM 42-193/d or later is
installed) for more details about the RACC system.
Note:
Refer to Section 20-90 before starting maintenance work in the center wing area.
2. Description and Operation
The DA 42 NG has two separate systems for heating and one ventilating/cooling system for the cabin
area. Figure 1 shows the schematic for the heating and ventilating/cooling systems.
Refer to Section 21-20 for more data about the air conditioning distribution system. Refer to Section
21-40 for more data about the heating system and refer to Section 21-60 for more data about the
temperature control system.
A. Cabin Heating and Canopy Defrosting
A heat exchanger in each engine nacelle provides the warm air for cabin heating. Hot cooling liquid
from the engine cooling system flows through the matrix of the heat exchanger. Ambient air flows
from an air inlet in the engine nacelle through the heat exchanger. The air flows from the heat
exchanger through a control valve to the airplane cabin. The heated air is then used for cabin
heating and windscreen defrosting. Levers in the central control console of the cockpit connect to
the control valves with Bowden cables and control the flow of heated air.
The warm air from the left engine installation supplies the canopy defrosting system and the warm
air from the right engine installation supplies the cabin heating.
Doc # 7.02.15
Rev. 4
AIRCRAFT
CHAPTER 21
HEATING AND VENTILATION
Heating and Ventilation
21-00-00
Page 1
15 Mar 2018
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Table of Contents
Troubleshooting
