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General
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A. This chapter covers the independent instruments and instrument systems of the 747-400 airplane. Instrument panels are provided for the flight crew, flight attendants, cargo handling personnel, and ground crew. The instrument systems consist of electronic clocks, a flight data recorder system, an aircraft condition monitoring system, a weight and balance system, an aural warning system, and an integrated display system.
Electrical/Electronic Panels (FIM 31-01-00)
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A. The Electrical/Electronic Instrument panels identified are those that have three or more relays that belong to two or more unrelated systems. The panels may also have other components mounted in them such as transformers, switches, diodes, circuit breakers or modules.
Instrument Panels
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A. The instrument panels are arranged in groups consistent with the prime user of the panels. The location of the panels in the flight compartment area is shown in figure 1. The instrument panels are described in AMM 31-10-00/001.
Independent Instruments
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A. The clocks (electronic) provide the primary time reference for the
flight crew. The clocks are described in AMM 31-25-00/001.Recorders
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A. A flight data recorder system (AMM 31-31-00/001) maintains a record of significant airplane flight parameters which are recorded in digital form on magnetic tape.
B. The aircraft condition monitoring system (ACMS) collects and records an airplane's operational data to permit detailed analysis of performance and maintenance requirements. ACMS records operational data of engine condition, auxiliary power unit condition, and the environmental control system condition. This data is gathered by the data management unit and sent to a digitial ACMS recorder. The aircraft condition monitoring system is described in AMM 31-35-00/001.
Central Computers
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A. The weight and balance system (AMM 31-41-00/001) provides on-board aircraft weighing and a determination of the center of gravity point. This system allows the airplane load to be maximized while providing greater safety for takeoff and flight conditions.
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MAINTENANCE MANUAL
P461
P10
P7-1 P7-2
P72 P2-1 P5 P2-3 P72
P2-4
P11
P2-2
P1-2 P9
P1-1
P3-2
P13
P8
P6
P1-3 P3-3 P3-1 P45
P1-4 P2-4
P44
P1 PANEL-CAPTAINS MAIN INSTRUMENT
P2 PANEL-PILOTS CENTER INSTRUMENT
P3 PANEL-FIRST OFFICERS MAIN INSTRUMENT
P5 PANEL-PILOTS OVERHEAD
P6 PANEL-MAIN POWER DISTRIBUTION
P7 PANEL-OVERHEAD CIRCUIT BREAKER
P8 PANEL-AFT PILOTS ELECTRONICS
P9 PANEL-FWD PILOTS ELECTRONICS
P10 PANEL-AUTOMATIC FLIGHT CONTROL
P11 PANEL-FIRST OBSERVERS CONSOLE
P13 PANEL-SECOND OBSERVERS CONSOLE
P44 PANEL-CAPTAINS AUXILIARY
P45 PANEL-FIRST OFFICERS AUXILIARY
P72 PANEL-PILOTS GLARESHIELD
P461 PANEL-PILOTS MAINTENANCE
Flight Compartment Instrument Panel Location
Figure 1
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MAINTENANCE MANUAL
7. Central Warning Systems
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A. The Modularized Avionics Warning Electronics Assembly (MAWEA) is a card file containing cards that generate signals for four different warning systems (AMM 31-51-00/001).
B. The aural warning system alerts the flight crew of abnormal takeoff and landing conditions, abnormal airspeed indications, autopilot disconnect, altitude alert, a detected fire condition, calls from attendants, and selective calls received over the communications system. The aural warning system is described in AMM 31-52-00/001.
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