the display.
(g)
Decrease the vacuum to the ambient pressure (14.70 psia at sea level).
(h)
Remove the vacuum pump from the altitude warning switch.
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757 MAINTENANCE MANUAL
G. Do the Cabin Pressure Indication System Test
S 735-008
(1)
Do the cabin altimeter test
(a)
Open this circuit breaker, on the overhead circuit breaker panel P11: 1) 11B13, CABIN ALTM
(b)
Make sure the needle, on the cabin altitude indicator, on the pilot's overhead panel P5, aligns with the OFF mark on the indicator face.
(c)
Close this circuit breaker, on the P11 panel: 1) 11B13, CABIN ALTM
(d)
Turn the BARO knob, on the standby altimeter on pilot's center instrument panel P1, set the internal barometer to 29.92 in. Hg.
(e)
Make sure the CABIN ALT indicator, on the P5 panel, shows the same altitude (|125 feet) as the standby altimeter, on the P1 panel.
S 735-009
(2)
Do the cabin differential pressure indicator test
(a)
Open this circuit breaker, on the P11 panel:
1) 11B12, CABIN DIFF PRESS IND
(b)
Make sure the needle on the CABIN DIFF indicator, on the P5 panel, points to the OFF mark.
(c)
Close this circuit breaker, on the P11 panel: 1) 11B12, CABIN DIFF PRESS IND
(d)
Make sure the needle on the CABIN DIFF indicator, on the P5 panel, points to 0 |0.15 psi.
WARNING: MAKE SURE THE PROCEDURE TO APPLY THE VACUUM TO THE
_______ ALTERNATE STATIC SYSTEM IS DONE CORRECTLY. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR IF THE PROCEDURE IS NOT DONE CORRECTLY.
(e)
Attach the pitot-static tester to the alternate static pressure system (Ref 34-11-00).
(f)
Increase the vacuum on the alternate static pressure system at a rate no greater than 5000 ft/min (Ref 34-11-00). Increase the vacuum until the airspeed indicator on the pitot-static tester shows 345 knots.
(g)
Make sure the needle on the CABIN DIFF indicator points to
3.0 |0.15 psi.
(h)
Decrease the vacuum to the ambient altitude at a rate no greater than 5000 ft/min.
(i)
Remove the pitot-static tester from the static pressure system.
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757 MAINTENANCE MANUAL
H. Put the airplane back to its usual condition
S 415-013
(1)
Close the access door, 119BL, to the main equipment center (Ref 06-41-00).
S 865-012
(2)
Remove the electrical power if it is not necessary (Ref 24-22-00).
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757
MAINTENANCE MANUAL
PRESSURIZATION AND INDICATION WARNING MODULE - REMOVAL/INSTALLATION
___________________________________________________________________
1. General
_______
A. This procedure contains two tasks. The first task is the removal of the pressurization and indication warning module. The second task is the installation of the pressurization and indication warning module.
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