Eagle ICA-D212-725, Инструкция по эксплуатации

Страница: 125 / 729

ICA-D212-725 (21
)
Page 4 of 14
CHAPTER 21 – AIR DISTRIBUTION (VENTILATION) (21-00-00)

COPYRIGHT

2007 BY DART AEROSPACE LTD.

THIS DOCUMENT IS PRIVATE AND CONFIDENTIAL AND IS SUPPLIED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED FOR ANY PURPOSE OR COPIED OR COMMUNICATED TO ANY
OTHER PERSON WITHOUT WRITTEN PERMISSION FROM DART AEROSPACE LTD.
Revision:
4
Date: 11.06.01
21.1 AIR DISTRIBUTION
(VENTALATION)
The cabin air distribution system includes two
subsystems which provide optional use of heated
or ventilation air from separate sources directed
through the same ducting. Functional separation
of the systems is obtained by flow actuated Y-
valves located under the windshield defrost-defog
nozzles. Refer to Figure 21-1 for air distribution
system schematic.
Heated air for cabin heating and defrosting
windshields is provided by bleed air from power
section compressor. The system pumps air
through ducting to outlets at both door posts,
either side of center pedestal, each side of
instrument panel, lower forward window nozzles,
and left and right windshield defrosting nozzles.
Heating is controlled by switches on overhead
console, a temperature selecting dial on right side
door post, and heater defrost control lever on right
side of center pedestal.
Ventilating-defogging system uses ram air as
source from intake grilles on cabin nose, with
optional use of blowers for windshield nozzle and
outlets ahead of crew stations. Air intake is
controlled by actuating a cable knob. Blowers are
controlled by an overhead panel switch.
The temperature selecting dial, through an electrical
positioning motor, controls a remote sensor which is
mounted on plenum chamber in the compartment on
right side below engine deck. This sensor, using a
bi-metallic element, senses temperature in heater
duct and controls the mixing valve through a small
tube which operates a bleed port valve.
When heater-defrost lever, on front right pedestal, is
moved forward to ON, a valve in base of pedestal is
closed by linkage to shut off heated air flow to the
four valves in pedestal base. Simultaneously, lever
linkage activates a micro-switch in base and closes
two valves on single shaft in air distribution outlet
control valve and shuts off heated air flow to
passenger compartment valves. When lever is
moved aft to OFF, the reverse actions occur to open
the valves
Engine compressor air flow noise is muffled by a
noise suppressor in rear of fuselage forward of the
mixing valve. Heated air exits from the noise
suppressor into a plenum chamber aft of the cabin
area. A temperature limit switch in aft cabin prevents
overheating. If temperature in plenum exceeds
220°F (104.4°C), the limit switch activates MASTER
CAUTION light and HEATER AIR LINE segment in
caution panel. Cycling continues until heater is
turned off or problem is corrected.