NO INDICATIONS (CAPTURE, RESET, OR INHIBIT MODE)
ALTITUDE READOUT BOX ON PFD's CHANGE FROM HALF-INTENSITY TO FULL-INTENSITY WHITE; WHITE BOX IS DISPLAYED AROUND THE SELECTED ALTITUDE READOUT ON PFD'S (APPROACH MODE)
ALTITUDE READOUT BOX ON PFD'S CHANGE FROM WHITE TO YELLOW; CAUTION MESSAGE ">ALTITUDE ALERT" APPEARS ON MAIN EICAS DISPLAY; MASTER CAUTION LIGHT COMES ON (DEVIATION MODE)
1 ALTITUDE ALERT SYSTEM RESETS
Altitude Alert Indications Envelope
Figure 3
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A
747-400 MAINTENANCE MANUAL
ALTITUDE ALERT SYSTEM - ADJUSTMENT/TEST
_______________________________________
1. General_______
A. This subject contains one task. This task is an operational test of the altitude alert system. This task uses equipment that is on the airplane to do a test of the system's operation.
TASK 34-16-00-715-001
2. Operational Test - Altitude Alert System________________________________________
A. General
(1) The operational test is made up of these components:
(a)
A test of the altitude alert system
(b)
A test of the EIU interface
(c)
A test of the air data inputs to the system
B. References
(1)
AMM 22-10-00/501, Autopilot/Flight Director
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 31-51-00/501, Aural Warning System
(4)
AMM 31-51-02/401, MAWEA Printed Circuit Cards
(5)
AMM 31-61-00/501, Integrated Display System
(6)
AMM 34-12-00/501, Air Data System
(7)
AMM 73-11-01/401, Fuel Pump
C. Access
(1) Location Zone 116 Area Between Nose Gear Well and Fuselage, RH 221 Control Cabin, LH 222 Control Cabin, RH
D. Prepare for the Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-003
(2)
Make sure that you disengage the autopilot and flight director (AMM 22-10-00/501).
S 865-004
(3)
Make sure that the air data system is serviceable
(AMM 34-12-00/501).
S 865-005
(4)
Make sure that the MAWEA and aural warning speakers are serviceable (AMM 31-51-00/501).
S 865-006
(5)
Make sure that the crew alerting and aural synthesizer cards are installed in the MAWEA (AMM 31-51-02/401).
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A
747-400 MAINTENANCE MANUAL
S 865-043
(6)
Make sure that the front panel LED's are not on (AMM 31-51-02/401).
S 865-007
(7)
Push the STAT button, on the EICAS display select panel, to show the status page on the auxiliary EICAS display.
S 865-008
(8)
Set the parking brake.
S 865-039
WARNING: DO NOT SET THE FUEL CONTROL SWITCH TO RUN BEFORE YOU OPEN THE
_______ APPLICABLE CIRCUIT BREAKERS. FUEL IN THE COMBUSTION CHAMBER CAN CAUSE A FIRE AND INJURY TO PERSONS OR ENGINE DAMAGE.
(9) Open these circuit breakers for engine No. 1 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) 6L10 FUEL CONT VALVE ENG 1
5) 6G1 FUEL SHUTOFF VALVE ENG 1
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