C. Procedure
S 424-007
CAUTION:_______BE CAREFUL WITH THE ACCELEROMETER. YOU CAN EASILY CAUSE DAMAGE TO THE ACCELEROMETER.
(1)
Put the accelerometer on the mounting bracket.
S 434-008
(2)
Install the screws that attach the accelerometer to the bracket.
S 434-009
(3)
Connect the electrical connector, D821.
S 864-010
(4)
Supply electrical power (AMM 24-22-00/201).
S 864-011
(5)
Close these circuit breakers:
(a) P18 Panel
1) FLIGHT RECORDER AC
2) FLIGHT RECORDER DC
S 734-029
(6) Do the applicable task: "Flight Data Recorder System acceleration signals test" (AMM 31-24-00/501 or 31-24-01/501 or 31-24-02/501 or 31-24-03/501 or 31-24-04/501).
NOTE: Some of the references may not be applicable to your airplanes.
S 864-014
(7) Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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31-24-81
ALL ú ú 10.1 Page 403 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CLOCKS - DESCRIPTION AND OPERATION
__________________________________
1. General_______
A. The captain's instrument panel contains one electronic clock. The first officer's instrument panel also contains one electronic clock. The two clocks are the primary time reference for the flight crew.
B. Each clock has an output data bus for transmitting Greenwich Mean Time (GMT) data. One clock transmits GMT data to the flight management computer (FMC).
C. AIRPLANES WITH P/N 2610-07-1 CLOCKS; The GMT data is also transmitted to the digital flight data acquisition unit.
D. The clocks receive operating power from the 28 VDC hot battery bus. Power for the displays comes from the 28VDC battery bus. Each clock and the display of each clock operate after the CLOCKS and CLOCKS DISPLAY circuit breakers on the P6 load control center - right are closed.
2. The Captain's and the First Officer's Clocks (Fig. 1)____________________________________________
A. Each clock has a display for the GMT, a display for the ET/CHR functions, and a sweep second hand. The top display on each clock shows GMT. The bottom display shows elapsed time and chronograph time. The sweep second hand shows CHR seconds.
B. The top display provides GMT display continuously from 00 hours 00 minutes to 23 hours 59 minutes. The GMT display is controlled by the GMT switch located in the lower right corner of the clock.
C. The GMT switch controls the GMT display as follows:
(1)
The RUN position is the normal operating position for the clock. The GMT operates normally while in this mode.
(2)
The HLD (hold) position is used to stop the GMT. Setting the switch to this position will hold the display at its present indicated value. The internal circuits of the clock will stop until the switch is set back to RUN. The HLD function is useful for synchronizing the clock with another time source.
(3)
The SS (slow slew) setting is used for slow slew operation. When set to this position, the minute display advances at a rate of 1 minute in each second. The hours display is stopped.
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31-25-00
ALL ú ú 04 Page 1 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
P/N 2600-03-1
P/N 2610-07-1
Captain's and First Officer's Clock Figure 1
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