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HIGH LIFT CONTROL -INTERFACES -ANALOG AND DISCRETE SIGNALS
Flap and Slat Electric Motors
The flap and slat electric motors move the flap and slat drive systems in the secondary and alternate modes. They receive electrical power through the sec/altn control relays.
Flap and Slat Primary Control Valves
The flap and slat primary control valves control the direction and speed of the flap and slat movement. The FSEUs control most of the solenoids in the flap and slat primary control valves. The sec/altn control relays control one solenoid in the flap and slat primary control valves. These two solenoids stop the hydraulic operation of the flaps and slats.
Autoslat Priority Valve
The autoslat priority valve limits the flow of hydraulic fluid to the main landing gear system. The FSEUs control a solenoid in this valve during autoslat operation.
Flap and Slat Position Sensors
The flap and slat position sensors supply flap and slat position signals to the FSEUs. The FSEUs use this data for:
*
Control feedback
*
Position indication
*
Fault monitoring.
Flap and Slat Skew Sensors
The flap and slat skew sensors supply signals to the FSEUs. The FSEUs use these signals to monitor the alignment of the flaps and slats.
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HIGH LIFT CONTROL -INTERFACES -ANALOG AND DISCRETE SIGNALS
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D633W101-BEJ Jan 05/2002
HIGH LIFT CONTROL -INTERFACES -ELECTRICAL POWER
General
Multiple buses supply electrical power to the HLCS. The HLCS receives electrical power from the:
*
28v dc battery bus
*
28v dc captain’s flight instrument bus
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28v ac standby bus
*
28v dc right main bus
*
28v ac right main bus
*
28v dc left main bus
*
115v ac left main bus
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115v ac right main bus.
These buses permit the separation of electrical power between lane one and lane two. The components in lane one get power from separate buses than the components in lane two.
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HIGH LIFT CONTROL -INTERFACES -ELECTRICAL POWER
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D633W101-BEJ Jan 05/2002
HIGH LIFT CONTROL -MODE SELECTION
General
The flaps and slats operate in one of three modes:
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Primary mode
*
Secondary mode
*
Alternate mode.
The FSEUs change the operational mode for any of these conditions:
*
There are component failures
*
There are position failures
*
The center hydraulic reservoir quantity is low
*
The secondary mode auto test is active
*
The airplane is in a ground maintenance condition
*
You use the alternate flaps arm switch.
The primary and secondary flap modes are independent of the primary and secondary slat modes. Thus, the flaps may be in the secondary mode while the slats are in the primary mode. This supplies the fastest system response to the flap lever commands.
The alternate flap mode is not independent of the alternate slat mode. Thus, when the alternate mode engages, both the flaps and slats are in the alternate mode.
Primary Mode Selection
The primary mode is automatically selected when there is a flap lever command. At that time, one lane is in control while the other lane is in standby.
If there is a component failure in the control lane, it causes a lane change. The flaps and slats continue to operate in primary mode.
These are the four types of component failures that cause a lane change:
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