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During a manual test of the autoslat system, these are some of
the steps you must do:
* Simulate the air mode
* Extend the LE slats using hydraulic system B power
* Manually move the AOA vanes.
When you move the AOA vanes, obey this warning:
WARNING: MAKE SURE THE AOA SENSORS ARE COOL
BEFORE YOU TOUCH THEM. THE AOA SENSORS
CAN BE SUFFICIENTLY HOT TO BURN YOU.
LE AUTOSLAT SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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LE AUTOSLAT SYSTEM - FUNCTIONAL DESCRIPTION
LE AUTOSLAT SYSTEM - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The LE flap and slat position indicating system measures the
position of the LE flaps and slats. The FSEU uses this data to
show the lights on the LE devices annunciator panel in the flight
deck. The FSEU also uses this data to show the LE FLAPS
TRANSIT light and the LE FLAPS EXT light.
Interfaces
There are 30 proximity sensors, two for each LE flap and slats 1
and 8, and three for slats 2 thru 7. These proximity sensors
measure the position of targets that move with the surfaces. The
proximity sensors send this data to the FSEU. The FSEU uses
this data to control the LE devices annunciator panel and lights
in the flight deck.
The FSEU also sends this data to these components:
* Flight data acquisition unit (FDAU)
* Stall management yaw damper (SMYD) computers
* Proximity switch electronic unit (PSEU).
LE FLAP AND SLAT POSITION INDICATING SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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LE FLAP AND SLAT POSITION INDICATING SYSTEM - GENERAL DESCRIPTION
LE FLAP AND SLAT POSITION INDICATING SYSTEM - GENERAL DESCRIPTION
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Purpose
The LE flap proximity sensors send LE flap position data to the
FSEU. The FSEU uses this data for position indication and
sends this data to other user systems.
Location
There are eight LE flap proximity sensors, two for each LE flap.
To get access to the LE flap proximity sensors, extend the LE
flaps.
The LE flap proximity sensors that have a target near at the
retract position are identified as the retract sensors. The LE flap
proximity sensors that have a target near at the extend position
are identified as the extend sensors.
Functional Description
The LE flaps proximity sensors use ferrous metal targets that
are not magnets.
The FSEU monitors the impedance of the proximity sensors.
The impedance has a relation to the position of the targets to
the sensors. As the LE flaps move, the targets move with them
and the impedance of the proximity sensors change.
The FSEU detects a target-near condition when a target is
directly in front of the sensor. When no part of a target is in front
of the sensor, the FSEU detects a target-far condition.
Training Information Point
The LE flap proximity sensors are interchangeable with each
other and with the LE slat inboard and outboard sensors.
Remove or install shims to adjust the sensors.
You can use the FSEU BITE to see the target gap information for
each sensor.
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE FLAP PROXIMITY SENSORS
EFFECTIVITY
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LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE FLAP PROXIMITY SENSORS
LE FLAP AND SLAT POSITION INDICATING SYSTEM - LE FLAP PROXIMITY SENSORS
EFFECTIVITY
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