S 745-025
S 755-026
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I.
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747-400 MAINTENANCE MANUAL
(c)
31170 Captains Speaker Off/Fail
(d)
31171 First Officers Speaker Off/Fail.
S 865-029
(5) If CMCS messages exist, perform corrective action per 31-CMCS
message index.Landing Config Warning Test
S 755-051
(1) Make sure the yellow LED (Interface Fault) in front of the Config.
Warn Card (A13) is off after 20 seconds after the MAWEA power up.Autopilot Disengage Test
S 865-024
(1) Open this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7E24 AUTO FLT WARN
S 865-025
(2) Push and hold the Autopilot Disengage switch on the Capt's or F/O's Control Column.
(a) Make sure the siren comes on for 1 second.
S 865-028
(3) Release the Autopilot Disengage switch.
(a) Make sure the warning goes off.
S 865-039
(4) Close this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7E24 AUTO FLT WARN
S 865-031
(5) If the Master Warn light does not go off, reset the Master Warn
light.Put the Airplane Back to Its Usual Condition
S 865-008
(1) Remove electrical power if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
AURAL WARNING SPEAKER - REMOVAL/INSTALLATION
____________________________________________
1. General_______
A. This procedure has three tasks. The tasks are: a removal, an installation, and a test of the aural warning speakers. The aural warning speakers are in the control cabin.
B. Power is supplied through the AURAL WARN (L & R) circuit breakers on the overhead circuit breaker panel P7.
TASK 31-52-04-004-001
2. Aural Warning Speaker Removal (Fig. 401)_____________________________
A. Access
(1) Location Zone
221 Control Cabin
B. Procedure
S 864-009
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7A04 AURAL WARN R
2) 7A03 AURAL WARN L
S 024-010
(2) Remove the speaker:
(a)
Loosen the four screws that hold the speaker to the ceiling.
(b)
Pull the speaker from the ceiling.
(c)
Remove the wires that connect to the speaker. 1) Identify the wires with labels, if it is necessary.
TASK 31-52-04-404-005
3. Aural Warning Speaker Installation (Fig. 401)__________________________________
A. Access
(1) Location Zone
221 Control Cabin
B. Procedure
S 424-011
(1) Install the speaker:
(a) Connect the speaker wires to the speaker pins.
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MAINTENANCE MANUAL
FIRST OFFICER'S
WARNING SPEAKER
SEE A
CAPTAIN'S WARNING SPEAKER
SEE A
ATTACHMENT SCREW (4 LOCATIONS)
FRONT VIEW
A
Aural Warning Speaker Installation
Figure 401
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