737 Flight Crew Operations Manual
Air Systems -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 2.10.5
7 TRIM AIR Switch
ON - trim air pressure regulating and shutoff valve signaled open.
OFF - trim air pressure regulating and shutoff valve signaled closed.
8 Recirculation (RECIRC) FAN Switches
OFF - fan signaled off.
AUTO –
• in-flight –
• the left recirculation fan operates if both packs are operating unless
either PACK switch is in HIGH
• the right recirculation fan operates if both packs are operating unless
both PACK switches are in HIGH.
• on the ground –
• the left recirculation fan operates unless both PACK switches are in
HIGH
• the right recirculation fan operates even if both PACK switches are in
HIGH.
9 PACK Light
Illuminated (amber) –
• indicates pack trip off or failure of both primary and standby pack
controls
• during Master Caution recall, indicates failure of either primary or
standby pack control. Extinguishes when Master Caution is reset
10 TRIP RESET Switch
Push (if fault condition is corrected) –
• resets BLEED TRIP OFF, PACK or ZONE TEMP lights
• related engine bleed air valve opens, or related pack valve opens, or
related trim air modulating valve opens
Lights remain illuminated until reset.
September 27, 2012
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