WES -FIRE WARNING
EFFECTIVITY BEJ ALL 31-51-00
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WES -AUTOPILOT DISCONNECT WARNING
General
The autopilot flight director computers (AFDCs) supply autopilot disconnect discrete signals to the WEUs when the autopilot disconnects.
If at least two autopilot disconnect discrete signals show for at least one second, the WEUs give an autopilot disconnect warning.
Before a WEU channel gives an autopilot disconnect warning, at least one other WEU channel must give the same warning.
The aural alert logic gives the siren alert aural. The master warning light logic makes the warning lights (MWLs) come on.
Push any master warning light to make the master warning lights go out. The siren continues until the autopilot disconnect signals clear.
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777 AIRCRAFT MAINTENANCE MANUAL
WES -AUTOPILOT DISCONNECT WARNING
EFFECTIVITY BEJ ALL 31-51-00
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D633W101-BEJ Jan 05/2003
WES -OVERSPEED WARNING
General
The stall warning function of the WEUs makes the overspeed warning signal.
Before a WEU channel gives an overspeed warning, at least one other channel must give the same warning.
If there is a takeoff warning inhibit, the WEUs do not make the overspeed warning signal.
BEJ 008-999; BEJ 001-007 POST SB 777-31-0064
Push any master warning light to make the master warning lights go out and stop the siren.
BEJ 001-007 PRE SB 777-31-0064
The siren stops and the overspeed warnings turn off when the overspeed condition stops.
BEJ ALL
EFFECTIVITY BEJ ALL 31-51-00
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777 AIRCRAFT MAINTENANCE MANUAL
WES -OVERSPEED WARNING
EFFECTIVITY BEJ 008-999; BEJ 001-007 POST SB 777-31-0064 31-51-00
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777 AIRCRAFT MAINTENANCE MANUAL
WES -OVERSPEED WARNING
EFFECTIVITY BEJ 001-007 PRE SB 777-31-0064 31-51-00
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31-51-00
Page 55 D633W101-BEJ Jan 05/2003
WES -CABIN PRESSURE WARNING
General
The remote cabin pressure sensor senses cabin pressure. The cabin pressure signal goes to the standby power panel (P310). The standby power panel (P310) supplies the cabin pressure signal to the AIMS cabinets. The AIMS cabinets supply a digital signal for a cabin altitude greater than 10,000 feet to the WEUs.
Before a WEU channel makes a cabin altitude warning, at least another WEU channel must make the same warning.
Each WEU channel inhibits cabin altitude warnings when the airplane is in takeoff.
The master warning light logic makes the master warning lights (MWLs) come on. The alert aural logic makes the siren alert aural.
Push any master warning light to make the master warning lights and the siren go out.
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777 AIRCRAFT MAINTENANCE MANUAL
WES -CABIN PRESSURE WARNING
EFFECTIVITY BEJ ALL 31-51-00
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D633W101-BEJ Jan 05/2003
WES -UNSCHEDULED STABILIZER MOVEMENT WARNING
General
The primary flight computers (PFCs) supply a digital signal for unscheduled stabilizer movement to the AIMS cabinets. The AIMS cabinets supply this signal to the WEUs.
Before a WEU channel makes an unscheduled stabilizer movement warning, at least one other WEU channel must make the same warning.
The alert aural logic makes the siren alert aural. The master warning light logic makes the master warning lights (MWLs) come on.
Push any master warning light to make the master warning lights and the siren go out.
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WES -UNSCHEDULED STABILIZER MOVEMENT WARNING
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WES -ENGINE FAIL WARNING
Operation
The AIMS cabinets supply a digital signal for engine fail warnings.
Before a WEU channel makes an engine fail warning, at least one other WEU channel must make the same warning.
The master warning light logic, makes the master warning lights (MWLs) come on.
Push any master warning light to make the master warning lights go out.
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