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747-400 MAINTENANCE MANUAL
(b) Make sure that you do not see an altitude alert indication are on the auxiliary EICAS display.
S 715-034
(9) Set the first officer's AIR DATA source select switch to the R position and the captain's to the C position.
(a)
Make sure that the PFD's show satisfactory data.
(b)
Make sure that you do not see an altitude alert indication on the auxiliary EICAS display.
S 715-035
(10) Set the captain's AIR DATA source select switch to the L position.
(a)
Make sure that the captain's PFD shows incorrect altitude data.
(b)
Make sure that you see the status indication ALT ALERT SYS on the auxiliary EICAS display.
S 865-036
(11) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel.
1) 7A10 OR 7A11 ADC L PWR
G. Put the Airplane to Its Usual Condition
S 865-041
WARNING: SET THE FUEL CONT SWITCH TO OFF BEFORE YOU CLOSE THE ENGINE
_______ IGNITER CIRCUIT BREAKERS. FUEL IN THE COMBUSTION CHAMBER CAN CAUSE A FIRE AND INJURY TO PERSONS OR ENGINE DAMAGE TO THE ENGINE.
(1)
Set engine No. 1 fuel control switch to OFF.
S 865-042
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers for engine No. 1:
(a) P6 Main Power Distribution Panel
1) 6G1 FUEL SHUTOFF VALVE ENG 1
2) 6L10 FUEL CONT VALVE ENG 1
3) 6G19 STBY IGN ENG 1
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747-400 MAINTENANCE MANUAL
4) 6K19 IGN 2 ENG 1
5) 6F1 IGN 1 ENG 1
S 865-037
(3) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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CREW ALERTING CARD - REMOVAL/INSTALLATION
_________________________________________
TASK 34-16-01-004-001
1. Crew Alerting Card Removal__________________________
A. General
(1)
The altitude alert system circuitry is contained on the crew alerting card (YMXA7). It is installed in the Modular Avionics & Warning Electronic Assembly (MAWEA), located in the right crawlway forward of the main equipment center.
(2)
You will find the removal/installation procedure for the crew alerting card in AMM 31-51-02/401.
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WINDSHEAR ALERTING AND DETECTION SYSTEM - DESCRIPTION AND OPERATION
___________________________________________________________________
1. Windshear Alerting and Detection System - Description and Operation___________________________________________________________________
A. General
(1) The windshear alerting and detection system is a part of the ground proximity warning system. Refer to AMM 34-46-00, Ground Proximity Warning System for windshear alerting and detection system description and operation.
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