(4)
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.
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(d) The aural warning siren sounds.
NOTE: The aural warning siren can be silenced by pressing
____ the Master Warning and Caution switch/light.
(5)
Failure Indication:
(a)
If the high-altitude-landing switchlight is selected on (ON light comes on), and the high-altitude-sel/inop relay is not energized, the INOP light will come on.
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CABIN PRESSURE INDICATION AND WARNING SYSTEM - ADJUSTMENT/TEST
______________________________________________________________
TASK 21-33-00-735-001
1. System Test - Cabin Pressure Indication and Warning System__________________________________________________________
A. General
(1)
This procedure has instructions to do a test of the cabin pressure warning system and the cabin pressure indication system.
B.
Equipment
(1)
Pitot-Static Tester, commercially available
(2)
Portable pressure vacuum pump, commercially available
(3)
End fitting - compatible with MS 33649-4 female thread on the altitude Warning Switch (S431) and test tubing.
C.
References
(1)
06-41-00/201, Fuselage Access Doors and Panels
(2)
24-22-00/201, Electrical Power Control
(3)
34-11-00/201, Pitot-Static System
D.
Access
(1)
Location Zone
119 Main Equipment Center (Left)
(2)
Access Panels
119BL Main equipment center access door
E.
Prepare for the Test
S 865-002
(1)
Supply electrical power (Ref 24-22-00)
S 865-003
(2)
Make sure these circuit breakers, on the overhead circuit breaker panel P11, are closed:
(a)
11A32, INDICATOR LIGHTS 1
(b)
11P1, L IND LTS 1
(c)
11P29, R IND LTS 2
(d)
11S15, AIR/GND SYS 1
(e)
11S19, AIR/GND SYS 2
S 015-004
(3) Open the access door, 119BL, to the main equipment center (Ref/06-41-00)
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MAINTENANCE MANUAL
P5 PANEL
SEE A P11 PANEL
CABIN
PRESSURE
SELECTOR
CABIN ALTITUDE CONTROL
VALVE CLIMB MANUAL
AUTO RATE
P36 PANEL
OP
MIN MAX
CL
PRIMARY STATIC PORTS (REF)
DESCEND
LDG ALT
AUTO INOP
02970
MODE SELECT
AUTO 2
AUTO 1MAN
PRESSURIZATION AND INDICATING SEEB 1
WARNING MODULE
CABIN
HIGH ALT LDG 2
00 2 12
10 25
204 0
2 6
VIDEO ON
b84 6
ON
6 15108 12 6
w
FT X FPM X
INOP
DIFF PSI ALT 1000 RATE 1000
a
R
ALTITUDE
EQUIP COOLING CABIN
ALTNSMOKE PRESS DIFFA LIMIT:OVHT
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