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TE FLAP SYSTEM - TRAINING INFORMATION POINT - OTHER FUNCTIONS
EFFECTIVITY
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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The TE flap position indicating system uses the flap position
transmitters to measure the position of the TE flaps. This data
shows on the flap position indicator in the flight deck and also
goes to other user systems.
Interfaces with Other Components
The flap position transmitters send flap position data to these
components:
* Flap/slat electronics unit (FSEU)
* Flight control computers (FCC) (2)
* Stall management yaw dampers (SMYDs) (2).
The FSEU uses this data to control the flap position indicator
and to monitor the alignment of the TE flaps. The FSEU also
sends this data to other systems.
The FSEU uses data from the flap skew sensors to monitor for a
flap skew. During a flap skew, the FSEU changes the indication
on the flap position indicator to show this condition.
TE FLAP POSITION INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
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TE FLAP POSITION INDICATING - GENERAL DESCRIPTION
TE FLAP POSITION INDICATING - GENERAL DESCRIPTION
EFFECTIVITY
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Purpose
The flap position transmitters send flap position data to these
components:
* FSEU
* FCCs (2)
* SMYDs (2).
Location
There are two flap position transmitters. The position
transmitters are at the left and right ends of the flap drive
system, on transmissions 1 and 8. To get access, extend the TE
flaps.
Physical Description
Each flap position transmitter has three internal resolvers. Each
resolver uses 28v ac, 400 Hz excitation. The excitation for each
resolver comes from a different computer.
The flap position transmitter outputs zero resolver degrees
when the TE flaps are up and 270 resolver degrees when the TE
flaps are at 40. The resolver degrees increase as the TE flaps
extend.
Each flap position transmitter has a shaft lock and two rig
indicator windows.
Training Information Point
The alignment marks in the rig indicator windows must align
before installation. If they do not, you must push on the shaft
lock and turn the shaft until the alignment marks are aligned. To
do this, it may be necessary to turn the shaft up to 800 turns.
If you disconnect the flap torque tubes and manually move the
TE flaps, you must rig the flap position transmitters when you
connect the torque tubes again.
TE FLAP POSITION INDICATING - FLAP POSITION TRANSMITTER
EFFECTIVITY
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TE FLAP POSITION INDICATING - FLAP POSITION TRANSMITTER
TE FLAP POSITION INDICATING - FLAP POSITION TRANSMITTER
EFFECTIVITY
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Purpose
The flap position indicator shows the position of the left and
right wing TE flaps independently.
Location
The flap position indicator is on the P2 center instrument panel.
Physical Description
The flap position indicator has left and right needles to show the
position of the left and right wing TE flaps independently. The
indicator also has reference marks to show the flap lever detent
positions. The indicator has one synchro for each needle. The
synchros receive inputs from the FSEU, which receive inputs
from the flap position transmitters.
There are no internal stops for the needles. Therefore, the
needles can move to any position, including the area at the
bottom left of the indicator.
TE FLAP POSITION INDICATING - FLAP POSITION INDICATOR
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