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has retract and extend limits that change based on flap lever
position and flap position. If the TE flaps move to less than the
retract limit, or more than the extend limit, the FSEU detects an
uncommanded motion.
The left ADIRU provides airplane speed input to the FSEU. The
FSEU will detect a UCM at any airspeed. When a UCM is
detected at an airspeed less than 60 knots, the FSEU sends a
signal to the PSEU for the takeoff warning system. When a UCM
is detected at an airspeed more than 60 knots, the FSEU also
sends a signal to the TE flaps bypass valve to move to the
bypass position.
During TE flap load relief operation, the FSEU changes the
retract and extend limits to let the flaps move.
After a flap UCM, you must cycle the power to the FSEU on the
ground to permit normal operation again.
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - UNCOMMANDED MOTION DETECTION
EFFECTIVITY
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TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - UNCOMMANDED MOTION DETECTION
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General
The flap load relief function prevents damage to the flaps and
their support structures from large aerodynamic forces.
Flap load relief limits the positions of the TE flaps as a function
of airspeed. Flap load relief operates only during normal
operation of the TE flaps.
Load Relief - 30
The load relief solenoid energizes when the flap lever is at the
40 unit position and the airspeed increases to more than 163
knots. This causes the TE flaps to retract to the 30 position.
The load relief solenoid deenergizes when the pilot moves the
flap lever to the 30 unit position or if the airspeed decreases to
less than 158 knots.
Load Relief - 25
The load relief solenoid energizes when the flap lever is at the
30 unit position and the airspeed increases to more than 176
knots. This causes the TE flaps to retract to the 25 position.
The load relief solenoid deenergizes when the pilot moves the
flap lever to the 25 unit position or if the airspeed decreases to
less than 171 knots.
NOTE: If the flap lever is at 40, the flap load relief function
cannot retract the flaps to 25.
Indication
GUN 001-099, 101-115
There is no indication for the flap load relief function.
GUN 201-999
When the FSEU sends a command to energize the flap load
relief solenoid, the FLAP LOAD RELIEF amber light shows on
the P3 panel.
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Test
You can do a test of the flap load relief function when the
airplane is on the ground. Use the BITE panel on the FSEU to do
this test. During this test, the TE flaps move.
TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - FLAP LOAD RELIEF
EFFECTIVITY
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TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - FLAP LOAD RELIEF
EFFECTIVITY
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TE FLAP SYSTEM - FUNCTIONAL DESCRIPTION - FLAP LOAD RELIEF
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
During the alternate operation, the alternate flaps switches
control the TE flap electric motor and flap bypass valve.
Arm
When you move the alternate flaps arm switch to the ARM
position, electrical power becomes available to the alternate
flaps control switch. The arm switch also supplies power to
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