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(29°C)
MAN (spring loaded to 6 o’clock position) - flight deck trim air valve controlled
manually
C (cool) - valve moves toward closed to provide cooler air
W (warm) - valve moves toward open to provide warmer air
Zone Reset Switch and Zone System Fault Light
ZONE RST
SYS
FAULT
ECS PANEL
1
2
December 01, 1999
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.3
1 ZONE Reset (RST) Switch
Push -
• resets zone temperature controller if fault no longer exists
• reopens master trim air valve if duct overheat no longer exists
2 Zone System (SYS) FAULT Light
Illuminated (amber) -
• temperature zone duct overheat or zone temperature controller fault has
occured
• master trim air valve failed closed
• Trim Air switch off
• master trim air valve closed and pack air continues to flow
Trim Air Switch
1 TRIM AIR Switch
ON –
• master trim air valve open and zone trim air valves operate automatically
• automatic and manual selection of pack controller A or controller B
enabled
Off -
• master trim air valve closed
• pack output temperature in backup mode regulated to provide average
passenger cabin temperature from 65°F (18°C) to 85°F (29°C) as selected
by passenger temperature selector inAUTO
• cabin temperature panel control of temperatures inhibited
• pack controller A selected and both automatic and manual selection of
pack controller B inhibited
• if pack controller A failed, pack controller B selected automatically
TRIM AIR
ON
ECS PANEL
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.4 D6-30151-425
Air Systems -
Controls and Indicators
Recirculation Fans Switch
1 Recirculation (RECIRC) Fans Switch
ON - recirculation fans controlled automatically.
Off - recirculation fans off.
Aft Cargo Heat Switch
1 AFT CARGO Heat (HT) Switch
ON –
• overheat shutoff valve opens to provide bleed air heat to aft and bulk
cargo compartments
• temperature control valve closes and opens to maintain temperature
• overheat shutoff valve closes and opens for overheat protection
Off - shuts off aft cargo heat bleed air to compartment.
2 Aft Cargo Temperature (TEMP) Light
Illuminated (amber) –
• compartment temperature excessive
• overheat shutoff valve closes
• inhibited on the ground and during climb
UPR-RECIRC-LWR
ON ON
ECS PANEL
1
ON
TEMP
AFT CARGO HT
ECS PANEL
1
2
December 01, 1999
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.5
Equipment Cooling Selector
1 Equipment (EQUIP ) COOLING Selector
STBY -
• equipment cooling ground exhaust valve closed and inboard exhaust valve
open; automatic control bypassed to configure system for flight
• all other automatic system operation same as in NORM
NORM -
• ground operation based on ambient temperature; equipment cooling air
exhausted overboard or exhausted into forward cargo compartment
• with two or more engines running, cooling air exhausted into forward
cargo compartment and equipment cooling ground exhaust valve closed
• with a single internal fault, inboard exhaust valve closes and cooling
system reconfigures to allow internal closed loop recirculation of cooling
air
OVRD -
• equipment cooling ground exhaust valve and inboard exhaust valve closed
• equipment cooling supply valve closed; cooling air supplied through
flight panels
• smoke/override valve open; differential pressure exhausts cooling air
overboard
Pack High Flow Switch
EQUIP COOLING
STBY OVRD
NORM
ECS PANEL
1
HI FLOW
ON
ECS PANEL
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.6 D6-30151-425
Air Systems -
Controls and Indicators
1 Pack High (HI) FLOWSwitch
ON –
• all operating packs provide high air flow
• memo message PACKS HIGH FLOW displayed on EICAS
Off - pack air flow controlled automatically.
Pack Control
1 PACK Reset (RST) Switch
Push –
　
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