(2)
IPC 34-13-01 Fig. 1
C. Access
(1) Location Zone
221 Control Cabin, LH
D. Procedure
S 864-005
(1) Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
(a)
P6 Main Power Distribution Panel
1) 6L1 FLT DECK LIGHT STBY INST
2) 6E19 FLT DK LIGHTS PANEL CAPT
(b)
P7 Overhead Circuit Breaker Panel
1) 7B26 STBY INSTR ALTM VIB
S 424-006
(2) Install the standby altimeter:
(a)
Remove the dust caps from the electrical connectors.
(b)
Examine the electrical connectors for loose, bent, or broken pins.
CAUTION: DO NOT CONNECT THE PITOT-STATIC SYSTEM HOSES WHEN THE
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. THIS CAN CAUSE DAMAGE TO THE STANDBY ALTIMETER.
(c)
Connect the pitot-static hose to the altimeter.
(d)
Make sure the pitot-static hose connection is locked in the sealed position.
(e)
Connect the electrical connector to the altimeter.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
CAUTION:_______ CAREFULLY PUT THE ALTIMETER INTO THE INSTRUMENT PANEL. TOO MUCH FORCE CAN CAUSE DAMAGE TO THE ELECTRICAL CABLE AND THE HOSE ON THE REAR OF THE ALTIMETER.
(f) (g) Put the altimeter into the instrument panel.Tighten the two adjustment screws adjacent to the altimeter.
(3) S 864-007Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6 Main Power Distribution Panel 1) 6L1 FLT DECK LIGHT STBY INST 2) 6E19 FLT DK LIGHTS PANEL CAPT
(b) P7 Overhead Circuit Breaker Panel 1) 7B26 STBY INSTR ALTM VIB
(4) S 864-008Supply electrical power (Ref 24-22-00/201).
(5) S 714-009Make sure the altimeter lights are on.
(6) S 864-010Remove electrical power if it is not necessary (Ref 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1.
2.
3.
A
747-400 MAINTENANCE MANUAL
ALTITUDE ALERT SYSTEM - DESCRIPTION AND OPERATION
_________________________________________________
General
_______
A. The altitude alert system provides the pilots with aural and visual awareness of actual airplane altitude compared to a selected altitude. The modes of operation are approach, capture, deviation, reset, or inhibit.
B. The altitude alert system circuitry is contained on the crew alerting card in the modular avionics and warning electronic assembly (MAWEA) card file. The card compares baro-corrected altitude with the selected altitude to determine mode and provides outputs to interfacing systems to generate the appropriate indications for that mode.
Crew Alerting Card (Fig. 1)
__________________
A. The crew alerting card performs altitude alert and several other crew awareness functions as part of the aural warning system.
B. The crew alerting card receives and processes inputs to the altitude alert system and provides altitude advisory and alert outputs to interfacing systems when the airplane approaches or deviates from a selected altitude.
C. The crew alerting card is installed in the MAWEA card file (STA 348, WL 153, RBL 25). The card front panel has a red LED that comes on to indicate a card fault and a yellow LED that comes on to indicate an interface fault.
Altitude Alert Interfacing Systems (Fig. 1)
__________________________________
A. The altitude alert system interfaces with the following systems:
(1)
Aural Warning System (Ref 31-51-00)
(2)
Air Data Computer System (Ref 34-12-00)
(3)
Autopilot/Flight Director (Ref 22-10-00)
(4)
Integrated Display System (Ref 31-61-00)
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