WES -TAKEOFF ATTEMPT AND CONDITIONS MONITORED IN TAKEOFF
Takeoff Attempt
The takeoff attempt signal enable permits the WEU to make a takeoff configuration warning.
The AIMS cabinets supply engine in takeoff thrust signals and the fuel control switch in run signals to the WEUs.
The WEUs make a takeoff attempt signal when a fuel control switch is in the run position and an engine gets to takeoff thrust.
Conditions Monitored in Takeoff
The takeoff configuration function of the WEUs monitors these conditions when the flight crew makes a takeoff attempt:
*
Flaps and leading edge devices not in takeoff position
*
Stabilizer not in takeoff position
*
Parking brake set
*
Main gear steering not locked
*
Rudder not in takeoff trim
*
Speed brake lever not down
*
Passenger entry and cargo doors closed, latched, and locked.
If any of the above conditions occurs in takeoff, the WEUs supply a takeoff configuration warning to the flight crew.
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General
The flap slat electronic units (FSEUs) supply flaps and leading edge devices in takeoff position digital signals to the WEUs.
Each WEU channel gets inputs from the two FSEUs. Selection logic on each WEU channel uses one of the FSEUs to set a true output when the flaps or leading edge devices are in the takeoff position.
Each selection logic selects one FSEU input only. The selection priority depends on the WEU channel. This is the selection priority for channel L1:
*
Left FSEU through the left bus
*
Left FSEU through the center 1 bus
*
Right FSEU through the center 1 bus.
This is the selection priority for Channel L2:
*
Left FSEU through the center 1 bus
*
Right FSEU through the center 1 bus
*
Left FSEU through the left bus.
This is the selection priority for Channel R1:
*
Right FSEU through the right bus
*
Right FSEU through the center 1 bus
*
Left FSEU through the center 1 bus.
This is the selection priority for Channel R2:
*
Right FSEU through the center 1 bus
*
Left FSEU through the center 1 bus
*
Right FSEU through the right bus.
Takeoff Configuration Warning Test Logic Interface
Each WEU channel has a takeoff configuration warning test logic. When you do a takeoff configuration warning test, this logic verifies all inputs to the takeoff configuration warning function. The logic checks that all inputs are available and valid.
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Stabilizer Not In Takeoff Position
The primary flight computers (PFCs) supply stabilizer position signals to the AIMS cabinets. The AIMS cabinets supply the signals to the WEUs. The compare logic gets the stabilizer position signals.
The stabilizer green band function of the WEUs supplies stabilizer green band selection to the compare logic. The selection is one of these:
*
Nose up band
*
Mid band
*
Nose down band.
The compare logic compares the stabilizer position and the stabilizer green band selection. If the stabilizer position is not in the green band, the compare logic makes a stabilizer not in takeoff signal.
Parking Brake Set
The parking brake handle has three switches. The switches supply parking brake handle released signals to the AIMS. The AIMS supplies the signals to the WEUs.
Each WEU channel supplies the signals from the three parking brake handle switches to a 2 of 3 vote logic. When at least two signals show the parking brake handle not released, the 2 of 3 vote logic makes a parking brake set signal.
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Speed Brake Lever Not Down 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 指示和记录系统 2
