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21-33-00
ALL ú ú 02 Page 2 ú Sep 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
STATIC PRESSURE SENSOR
Cabin Pressure Indication System
Figure 2
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21-33-00
ALL ú
ú 02 Page 3
ú Dec 20/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
CABIN PRESSURE
Cabin Pressure Warning System
Figure 3 (Sheet 1)
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GUN 001-003, 008-999 ú 21-33-00
ú ú 03 Page 4 ú Sep 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
HIGH ALTITUDE LANDING SWITCH/LIGHT
Cabin Pressure Warning System Figure 3 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. GUN 004-007 ú
21-33-00
ú ú 02 Page 5 ú Mar 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
A. GUN 001-003, 008-999;
_____________________
Altitude Warning System
_______________________
(1)
If the cabin altitude climbs to 10,000 feet, the altitude switch closes, which supplies a ground to cause the high-cabin-altitude-warning signals to occur. If the cabin altitude goes below 10,000 feet, the altitude switch opens and the high-cabin-altitude-warning signals will go off. The high-cabin-altitude-warning signals are:
(a)
The CABIN ALTITUDE light on the P5 panel comes on.
(b)
The CABIN ALT light on the captains instrument P1 panel comes on.
(c)
A level A EICAS message, CABIN ALTITUDE, appears.
(d)
The aural warning siren sounds.
NOTE: The aural warning siren can be silenced by pressing
____ the Master-Warning-and-Caution switch/light.
B. GUN 004-007;
____________
Altitude Warning System
_______________________
(1)
If the cabin altitude climbs to 10,000 feet, the altitude warning switch closes to supply a ground for the warning system. If the high-altitude-landing switchlight is selected off, the high-titude-sel/inop relay is relaxed to complete the circuit and cause the high-cabin-altitude-warning signals to occur.
(2)
If the high-altitude-landing switchlight is selected on, 28v dc power and ground are supplied through the switchlight to energize the high-altitude-sel/enable relay. When the sel/enable relay is energized, power is supplied to energize the sel/inop relay. When the sel/inop relay is energized, power is supplied to the cabin-high-altitude-warning switch. In this condition, if the cabin altitude goes above 14,500 feet, the switch will close to complete the circuit and cause the high-cabin-altitude-warning signals to occur.
(3)
If the cabin altitude is above 10,000 feet and the high-altitude-landing switchlight is selected off, the high-altitude-sel/enable relay will stay energized. When the sel/enable relay is energized, the high-cabin-altitude-warning signals will only occur if the cabin altitude goes above 14,500 feet. The sel/enable relay will stay energized as long as the cabin-altitude-warning switch supplies a ground (cabin altitude is above 10,000 feet). When the cabin altitude goes below 10,000 feet, the cabin-altitude-warning switch will open to cause the sel/enable relay to relax. With the sel/enable relay relaxed, the high-cabin-altitude-warning signals will occur when the cabin altitude goes above 10,000 feet.
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