S 865-157
(31)
Monitor the indications as follows:
NOTE: If you cannot monitor the indications in the time
____ specified above, do this step again before you monitor each indication.
(a) Make sure the pressure shown on the HYD BRAKE PRESS gage on the P1 panel does not change.
NOTE: The HYD BRAKE PRESS gage can decrease if hydraulic
____ system No. 2 is pressurized by the No. 2 hydraulic demand pump only. This decrease will occur if hydraulic system No. 2 pressure, as shown on EICAS, decreases below 1400 psig before it goes to 3000 psi.
(b)
Make sure the EICAS pressure indication for hydraulic system No. 2 momentarily decreases.
(32)
Release the brake pedals.
(33)
Remove pressure from hydraulic system No. 2 (AMM 29-11-00/201).
S 865-158
S 865-159
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
32-41-00
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A
747-400 MAINTENANCE MANUAL
S 865-160
WARNING:_______ MAKE SURE TO OPEN THE APPLICABLE ENGINE IGNITION CIRCUIT
BREAKERS BEFORE YOU OPEN THE ENGINE FUEL CONT VALVE CIRCUIT
BREAKER. THE IGNITER PLUGS CAN AUTOMATICALLY FIRE IF YOU DO
NOT OPEN THE CIRCUIT BREAKERS. WITH FUEL IN THE COMBUSTION
CHAMBER, AN INTERNAL ENGINE OR TAILPIPE FIRE CAN OCCUR. THIS
CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE ENGINE.
(34)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6, Main Power Distribution Panel 1) 6F1, IGN 1 ENG 1 2) 6K19, IGN 2 ENG 1 3) 6G19, STBY IGN ENG 1 4) 6F2, IGN 1 ENG 2 5) 6K20, IGN 2 ENG 2 6) 6G20, STBY IGN ENG 2 7) 6F3, IGN 1 ENG 3 8) 6K21, IGN 2 ENG 3 9) 6G21, STBY IGN ENG 3 10) 6F4, IGN 1 ENG 4 11) 6K22, IGN 2 ENG 4 12) 6G22, STBY IGN ENG 4 13) 6L10, FUEL CONT VALVE
NOTE: You must open the circuit breaker to cause the
____ master caution light and aural warning sound to come on. It is possible that the light and the sound will not come on for 5 minutes.
S 865-161
(35)
Make sure the BRAKE SOURCE light on the P1-4 panel is on.
S 865-162
(36)
Make sure the BRAKE SOURCE message shows on the upper EICAS display.
S 865-163
(37)
Make sure the master CAUTION lights on the autoflight control panel, P10, are on.
(38)
Make sure the aural warning sound has come on.
S 865-164
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
G. Put the Airplane Back to Its Usual Condition
S 865-122
(1)
Move the No. 1 through 4 TAIL FLIGHT CONTROL SHUTOFF switches and the WING FLIGHT CONTROL switches No. 1 through 4 on the P461 panel to the ON position.
S 865-123
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6, Main Power Distribution Panel
1) 6F1, IGN 1 ENG 1
2) 6K19, IGN 2 ENG 1
3) 6G19, STBY IGN ENG 1
4) 6F2, IGN 1 ENG 2
5) 6K20, IGN 2 ENG 2
6) 6G20, STBY IGN ENG 2
7) 6F3, IGN 1 ENG 3
8) 6K21, IGN 2 ENG 3
9) 6G21, STBY IGN ENG 3
10) 6F4, IGN 1 ENG 4
11) 6K22, IGN 2 ENG 4
12) 6G22, STBY IGN ENG 4
13) 6L10, FUEL CONT VALVE
TASK 32-41-00-715-171
3. Normal and Alternate Brake System - Operational Test____________________________________________________
A. General
(1)
There must not be unusual noise in the hydraulic lines or in the brake valves during the operational test.
B.
References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 12-15-09/301, Brake Hydraulic Accumulator
(3)
AMM 12-15-11/301, Hydraulic Pressure Surge Accumulator
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