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arm switch to the ARM position, this switch supplies electrical
power to move the bypass valve to the bypass position. This
prevents a hydraulic lock on the hydraulic motor and lets the
electric motor operate.
TE Flap Skew
The FSEU compares the data from symmetrical flap skew
sensors to monitor the alignment of the TE flaps. If the FSEU
detects a skew, it energizes the bypass valve.
TE Flap Asymmetry
The FSEU compares the data from the left and right TE flap
position transmitters to monitor the position of the TE flaps. If
the FSEU detects a flap asymmetry, it energizes the bypass
valve.
TE Flap Uncommanded Motion (UCM)
The FSEU compares the data from the TE flap skew sensors 1
and 8 to the data from the flap lever position sensor for the TE
flap UCM detection. If the TE flaps move away from their
commanded position, the FSEU energizes the bypass valve.
The TE flap uncommanded motion function is inhibited at
airspeeds below 60 knots. The FSEU gets airspeed data from
the left ADIRU.
BITE
During the TE ASYM-SKW-IND test on the FSEU BITE, the
bypass valve is commanded to the bypass position, then back to
the normal position. If the bypass valve does not operate
correctly, the BITE test fails.
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC BYPASS
EFFECTIVITY
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TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC BYPASS
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC BYPASS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
Trailing edge flap asymmetry protection is provided in normal
operation by the FSEU and the TE flaps bypass valve. No
asymmetry protection is provided during alternate flaps
operation.
When the FSEU detects a TE flap asymmetry, it sends a signal
to the TE flaps bypass valve to move to the bypass position. In
the bypass position, the bypass valve prevents TE flap hydraulic
motor operation.
Asymmetry Detection
The FSEU compares the data from the left and right TE flap
position transmitters to monitor the position of the TE flaps. If
they are different by more than 9 resolver degrees, there is an
asymmetry condition.
If the TE flaps are in an asymmetry condition, the FSEU sends
electrical power to the bypass valve. This stops the hydraulic
operation of the TE flaps.
During an asymmetry condition, the needles on the flap position
indicator show the actual data from the flap position
transmitters.
After a flap asymmetry, you must correct the asymmetry
condition to permit normal operation again. The asymmetry
condition resets when all of these conditions are true:
* The difference between left and right flap position
transmitters is less than 7.5 degrees
* The airplane is on the ground
* The airspeed is less than 60 knots.
The FSEU BITE TE ASYM-SKW-IND TEST? can also operate the
TE flaps bypass valve.
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - ASYMMETRY DETECTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-033
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - ASYMMETRY DETECTION
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - ASYMMETRY DETECTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-033
General
Trailing edge flap uncommanded motion (UCM) protection is
provided in normal operation by the FSEU and the TE flaps
bypass valve. No UCM protection is provided during alternate
flaps operation.
The FSEU detects and limits the amount of TE flap travel if there
is a failure that causes the flaps to move without a pilot
command. When the FSEU detects a TE flap uncommanded
motion, it sends a signal to the TE flaps bypass valve to move to
the bypass position. In the bypass position, the bypass valve
prevents TE flap hydraulic motor operation.
TE Flap Uncommanded Motion (UCM) Detection
The FSEU compares the data from the TE flap skew sensors 1
and 8 to the data from the flap lever position sensor. The FSEU
　
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