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also has a hole that engages an alignment pin on the skew
sensor input assembly.
FLAP SKEW DETECTION SYSTEM - FLAP SKEW SENSORS
EFFECTIVITY
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D633A101-GUN Feb 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-59-00-002
FLAP SKEW DETECTION SYSTEM - FLAP SKEW SENSORS
FLAP SKEW DETECTION SYSTEM - FLAP SKEW SENSORS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-59-00-002
Functional Description
There are eight flap skew sensors that interface with the FSEU.
The number in the name of each sensor relates to the flap drive
mechanism that the sensor connects to.
The excitation power for the sensors on the left wing is
independent from the excitation power for the sensors on the
right wing. Also, the wiring for the excitation power goes
through each sensor.
The FSEU uses the data from the flap skew sensors to monitor
the alignment of the TE flaps. These monitoring functions are
skew detection and asymmetry detection.
The skew detection and asymmetry detection functions can
operate on the ground. Either condition can bias the stall
warning command in the SMYDs. Either condition can also
cause the PSEU to command a takeoff warning.
Skew Detection
The FSEU compares the data from symmetrical sensors. If the
difference in the position of two symmetrical sensors is more
than a limit, then there is a skew condition. These are the
resolver difference limits:
* 28 degrees between skew sensors 1 and 8
* 28 degrees between skew sensors 2 and 7
* 26 degrees between skew sensors 3 and 6
* 34 degrees between skew sensors 4 and 5.
The skew condition resets when the difference is less than 13
degrees.
If the TE flaps are in a skew condition, the FSEU sends electrical
power to the bypass valve. This stops the hydraulic operation of
the TE flaps.
Also, during the skew condition, the FSEU sends an input to the
flap position indication control. This causes the needles in the
flap position indicator to be 15 degrees apart. To do this, the
FSEU first determines which wing had the skew, and then it
determines if the skew occurred during retraction or extension.
The FSEU compares the left skew sensor to the left flap position
transmitter. If they disagree, then the skew is on the left wing,
otherwise the skew is on the right wing.
The FSEU then compares the skew sensor on the skewed wing
to the flap position transmitter. If the skew sensor position is
more than the position transmitter position, the FSEU makes the
needle for the skewed flap move 15 degrees in the extend
direction. If the skew sensor position is less than the position
transmitter position, the FSEU makes the needle for the skewed
flap move 15 degrees in the retract direction.
FLAP SKEW DETECTION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-59-00
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-59-00-003
FLAP SKEW DETECTION SYSTEM - FUNCTIONAL DESCRIPTION
FLAP SKEW DETECTION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 27-59-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-59-00-003
General
The spoilers help the ailerons control airplane roll about the
longitudinal axis. They also supply speedbrake control to
reduce lift and increase drag during landing and refused
takeoff.
There are six spoilers on each wing. There is one spoiler
inboard of each engine strut, and five spoilers outboard of each
engine strut. Each spoiler has a number, 1 through 12 (from left
to right). The ground spoilers are the most outboard and the
most inboard spoiler on each wing. All the other spoilers are
flight spoilers.
Roll Control
During roll control, the flight spoilers on one wing move up and
all the other spoilers stay down.
The pilots manually control roll with the control wheels. When
the autopilot is in autoland, the autopilot commands the flight
spoilers.
Speedbrake Control
During speedbrake control, the spoilers on both wings move
symmetrically.
The pilots manually command speedbrake control with a
speedbrake lever on the aisle stand. The autopilot does not
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