Airplane Maintenance Manual
Bristell
B23-915
Chapter 21
supplement
Chapter 21 Page 2
Issue: 09.12.2021
21-40
Heating
Cockpit heating is ensured by hot air from the heat exchanger (see
Fig. 3). The heat exchanger (3) is located on the muffler (2). Ambient
inlet air (1) taken by the muffler is heated in the heat exchanger and
supplied through heating flap (6) located on the firewall into the
cockpit by air hose (2). Quantity of hot air is regulated by CabinHeat
knob (11) on the instrument panel. Behind the firewall a up/down
mixture flap (7) is located, which splits hot air flow into the canopy
bubble outlet (9) and into the crew legs outlet (8). The mixture flap is
controlled by the UP/DOWN knob (10).
Fig. 3
Heating System
Item
Description
Item Description
1
Air inlet (cowling connection)
2
Muffler
3
Heat exchanger (front & rear)
4
Clamp
5
Air hoses
6
Heating flap
7
Up/down mixture flap
8
Down outlet (crew legs)
9
Up outlet (canopy bubble)
10
UP/DOWN knob
11
CabinHeat knob