ATR 42 Model : 400/500
OXYGEN SYSTEM
EMERGENCY EQUIPMENT
P 2
NOV 98
001
1.07
.
20
HP ind.
Oxygen bottle pressure is displayed in PSI X 1000.
The scale is marked by a red arc from 0 to 85 PSI and by a green arc from 85 to
2025 PSI.
If preflight pressure is below 1400 PSI, quantity must be checked to be adequate
for intended flight (refer FCOM 2.01).
MAIN SUPPLY pb
Controls the low pressure supply solenoid valve.
ON
(pb pressed in). The valve is open, low pressure oxygen is supplied to
the cockpit crew oxygen masks.
OFF
(pb released). The valve is closed. OFF illuminates white.
LO PR Illuminates amber and the CCAS is activated when a low pressure (below
50 PSI) is detected in the low pressure distribution circuit.
PAX SUPPLY pb
ON
(pb pressed in) Passengers supply valve is open. ON illuminates blue.
OFF
(pb released) Passengers supply valve is closed.
AA
1
2
R
3
R
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