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• resets pack fault protection system
• restarts pack after automatic shutdown if fault no longer exists
2 Pack System (SYS)FAULT Light
Illuminated (amber) –
• pack overheat or other system fault has occured
3 PACK Control Selector
OFF –
• pack valve closed
• rextinguishes SYS FAULT light for pack selected off
• resets pack fault protection system
Normal (NORM) -
• pack controller A or B selected automatically on alternate flights
• selected controller is primary controller; selects secondary controller if
primary controller fails
A - selects pack controller A as primary controller; selects B if A fails.
SYS
FAULT
PACK RST
1 PACKS 2 PACKS 3
OFFNORM A
B
OFFNORMA
B
OFFNORMA
B
ECS PANEL
1
3
2
April 01, 2001
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.7
B - selects pack controller B as primary controller; selects A if B fails.
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.8 D6-30151-425
Air Systems -
Controls and Indicators
Pilot’s Auxiliary Heat andWindshield Air
Electric shoulder heater and foot heater operate only in flight.
1 FOOT Heater Switch
HI - under-floor electric heater operates on high setting.
LO - under-floor electric heater operates on low setting.
OFF - under-floor electric heater off.
2 SHOULDER Heater Switch
HI - electric heater adds heat at high setting to conditioned air flow to side
windows.
LO - electric heater adds heat at low setting to conditioned air flow to side
windows.
OFF - electric heater off.
3 Windshield (WSHLD) AIR Switch
ON - supplemental anti-fogging air supplied to windshield.
OFF - anti-fogging air off.
CAPTAIN’S AND FIRST OFFICER’S
SIDEWALL PANELS
1
2
3
HEATERS
FOOT
HI
LO
OFF
SHOULDER
WSHLD AIR
ON
HI
LO
OFF
OFF
December 01, 1999
747 Operations Manual
Air Systems -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 2.10.9
Pressurization System
Cabin Altitude Control
1 Landing Altitude (LDG ALT) Switch
Push - alternately changes landing altitude control between Automatic and
Manual.
Manual -
• landing altitude set by rotating Landing Altitude selector
• landing altitude information displays on primary EICAS followed by
MAN
Automatic -
• landing altitude set automatically from FMS
• landing altitude information displays on primary EICAS followed by
AUTO
2 Landing Altitude (LDG ALT) Selector
Rotate – sets landing altitude when MAN displayed on primary EICAS.
3 Outflow Valve Manual (MAN) Switch
ON -
• outflow valve in manual mode
• bypasses automatic outflow valve control and cabin altitude limiter
Off - outflow valve controlled automatically.
4 OUTFLOW VALVES Position Indicator
OP (Open) - outflow valve open.
CL (Closed) - outflow valve closed.
2
5
1
4
3 6
OVERHEAD PANEL
LDG ALT
.11 PSI
T/O & LDG
MAX ~P
PUSH ON
ON ON
CABIN ALTITUDE
CONTROL
NORM
A
B
OPEN MAN R
CLOSE
OP
CL
OUTFLOW
-VALVESAUTO
SELECT
OP
CL
MAN L
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
2.10.10 D6-30151-425
Air Systems -
Controls and Indicators
5 Cabin Altitude AUTO Selector (SELECT)
NORM -
• cabin altitude controller A or B selected automatically on alternate flights
• selected controller is the primary controller; selects secondary controller
if primary controller fails
A - selects cabin altitude controller A as primary controller; selects B if A fails.
B - selects cabin altitude controller B as primary controller; selects A if B fails.
6 Outflow Valves Manual Control
OPEN - valve moves toward open in manual mode.
CLOSE - valve moves toward closed in manual mode.
Bleed Air Control
1 Isolation (ISLN) VALVE Light
Illuminated (amber) – isolation valve position disagrees with switch position
2 Isolation (ISLN) Valve Switch
ON (bar in view) – valve open.
Off - valve closed.
1
OFF
　
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