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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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747-400
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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747-400
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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