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EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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TE FLAP POSITION INDICATING - FLAP POSITION INDICATOR
TE FLAP POSITION INDICATING - FLAP POSITION INDICATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Functional Description
There are two flap position transmitters and each has three
internal resolvers. The resolvers interface with these
components:
* FSEU
* Stall management yaw damper (SMYD) 1 and 2
* Flight control computer (FCC) A and B
* Integrated flight systems accessory unit (IFSAU).
The FSEU uses the flap position data to control the left and right
pointers in the flap position indicator. The FSEU also uses
inputs from the flap skew monitor. If the TE flaps are in a skew
condition, the FSEU changes the signals to one of the pointers
in the flap position indicator. This causes the pointers to be 15
degrees apart during a TE flap skew.
See the stall warning system for more information about the
SMYDs. (SECTION 27-32) See the autoflight chapter for more
information about the FCCs and the IFSAU. (CHAPTER 22)
TE FLAP POSITION INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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TE FLAP POSITION INDICATING - FUNCTIONAL DESCRIPTION
TE FLAP POSITION INDICATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The flap skew detection system uses the FSEU to monitor the
alignment of the TE flaps. The FSEU uses data from the flap
skew sensors and the flap position transmitters. If the TE flaps
do not stay in alignment, the FSEU does these functions:
* Operates the flap bypass valve
* Changes the flap position indicator
* Sends data to the SMYDs for stall warning
* Sends data to the PSEU for takeoff warning.
The FSEU monitors for a flap asymmetry condition and a flap
skew condition. There is a flap asymmetry condition if a flap on
one wing does not align with the symmetrical flap on the other
wing. There is a flap skew condition if the inboard end of a flap
does not align with the outboard end.
FLAP SKEW DETECTION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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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
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FLAP SKEW DETECTION SYSTEM - GENERAL DESCRIPTION
FLAP SKEW DETECTION SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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Purpose
The flap skew sensors send flap position data to the FSEU. The
FSEU uses this data to monitor the alignment of the TE flaps.
Location
There are eight flap skew sensors. There is one sensor at each
flap drive mechanism. To get access to the sensors at flap drive
mechanism 4 or 5, go through the MLG wheel well. To get
access to all the other sensors, extend the TE flaps.
Physical Description
Each flap skew sensor has one resolver that uses 28v ac 400 Hz
excitation. The table below shows the resolver degrees when
the TE flaps are at up and at 40. For sensors 1 thru 4, TE flap
extension causes the resolver degrees to increase. For sensors
5 thru 8, TE flap extension causes the resolver degrees to
decrease.
Flap Skew Sensor Outputs in Resolver Degrees
1 2 3 4 5 6 7 8
1 21 70 91 32 328 269 290 339
40 233 288 297 274 86 63 72 127
An input rod connects to the flap carriage and the skew sensor
input assembly.
The shaft on each flap skew sensor has a missing tooth for
alignment during installation. The flap skew sensor housing
　
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