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See the flap skew detection section for more information.
(SECTION 27-59)
TE Flap Uncommanded Motion (UCM) Detection
The FSEU receives inputs from the flap lever position sensor
and the TE flap skew sensors for UCM detection. If the TE flaps
move away from their commanded position, then the FSEU
operates the bypass valve. This stops the hydraulic operation of
the TE flaps.
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
EFFECTIVITY
GUN ALL 27-51-00
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LE Flap and Slat Position Indication
The FSEU receives inputs from the LE flap and slat sensors to
control the lights on the LE devices annunciator panel. The
FSEU also sends this data to the FDAU.
See the LE flap and slat position indicating section for more
information. (SECTION 27-88)
LE Cruise Depressurization
During cruise, the FSEU supplies a ground for the LE cruise
depressurization valve to prevent movement of the LE flaps and
slats.
See the LE flap and slat control section for more information
about the LE cruise depressurization function. (SECTION 27-81)
LE Flap and Slat Uncommanded Motion (UCM) Detection
The FSEU receives inputs from these to monitor the position of
the LE flaps and slats:
* Flap lever position sensor
* LE flap and slat sensors.
If two or more LE flaps or slats move away from the flap lever
position, the FSEU operates the LE UCM shutoff valve. This
stops the movement of all the LE flaps and slats.
See the LE flap and slat control section for more information
about the LE flap and slat uncommanded motion detection.
(SECTION 27-81)
BITE
The FSEU uses all of the electrical inputs that it receives to
monitor for failures. The FSEU has front panel BITE interface to
let you see this data and to do some tests of the TE flaps and LE
devices.
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
EFFECTIVITY
GUN ALL 27-51-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-005
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
EFFECTIVITY
GUN 001-099, 101-115 27-51-00
Page 19
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-005
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
EFFECTIVITY
GUN 201-999 27-51-00
Page 20
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-005
Purpose
The flap lever controls the position of the TE flaps and LE
devices. You use the flap lever during the normal operation of
the TE flaps. During the alternate operation, you do not use the
flap lever.
The flap lever position sensor sends flap lever position data to
the FSEU for the TE flaps UCM detection function. The FSEU
also sends this data to other airplane systems.
The flap lever position switches monitor flap lever position for
the flap load relief function and the LE uncommanded motion
(UCM) function.
Location
The flap lever is on the right side of the P10 control stand. The
flap lever position sensor and switches are below the flap lever,
in the control stand. To get access to the flap lever position
sensor, remove the lower panel on the right side of the control
stand. To get access to the flap lever position switches, remove
the stabilizer trim indicator panel and cover.
Physical Description
The flap lever is a spring-loaded, telescoping handle. It attaches
to the flap lever quadrant in the control stand. The quadrant
moves the flap cables that supply inputs to the flap control unit
in the MLG wheel well. Springs in the flap control unit supply a
resistant force on the flap lever.
The flap lever has an index pin that holds the flap lever in
detents in the detent plate. The detent plate has these detent
positions:
* 0
* 1
* 2
* 5
* 10
* 15
* 25
* 30
* 40.
Gates at detents 1 and 15 help the flight crew identify these
positions during go-arounds.
The flap lever position sensor has one synchro that uses 28v ac
excitation. The flap lever position sensor is at 0 resolver
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