AIRPLANE
OPERATIONS
MANUAL
PNEUMATICS
AIR CONDITIONING
AND PRESSURIZATION
REVISION 38
2-14-10
Page
9
Code
01
AOM-145/1114
NOTE: 1) The ECS OFF signal is activated for the pack associated
with the operating engine if the pressure altitude is lower
than 9700 ft and TAT is above -18°C (areas A and B in the
following envelope).
2) TAT above 19°C (66°F) at sea level, decreasing linearly to
-5°C (23°F) at 9700 ft.
3) The ECS OFF signal is activated for the Pack associated
with the operating engine if the pressure altitude is lower
than 9700 ft and TAT is above 19°C at sea level,
decreasing linearly to -5°C at 9700 ft (area A in the
following envelope).
4) A Low N1 condition (actual N1 does not achieve requested
N1) is considered one engine inoperative.
FADEC´S ECS OFF ENVELOPE
The ECS OFF logic is valid only when the packs are using engine
bleed. If APU bleed is being used, the ECS OFF logic is inhibited and
the pack valves will not shut down.
The FADEC’s discrete ECS OFF signal is not produced when using
ALT T/O-1 mode during takeoffs with all engines operative.
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