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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-004
TE FLAP SYSTEM - COMPONENT LOCATIONS 2
TE FLAP SYSTEM - COMPONENT LOCATIONS 2
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-004
Purpose
The flap/slat electronics unit (FSEU) supplies some control and
monitor functions for the TE flaps and the LE devices.
The FSEU includes these functions for the TE flaps and LE
devices:
* TE flap position indication
* TE flap load relief
* TE flap skew and asymmetry detection
* TE flap uncommanded motion detection (UCM)
* LE flap and slat position indication
* LE cruise depressurization
* LE flap and slat uncommanded motion detection (UCM)
* BITE.
There is more information on these functions later.
Location
The FSEU is on the E1-1 shelf in the electronic equipment
compartment.
Physical Description
The FSEU has front panel BITE with an LED display. The FSEU
weighs 13 lb (6 kg), and it is passively cooled.
Interfaces
The FSEU receives analog signals from these components:
* Alternate flaps arm switch for alternate operation
* Flap lever position sensor for monitoring, TE flap load relief,
and LE cruise depressurization
* TE flap position transmitters for position indication,
monitoring, and TE flap load relief
* TE flap skew sensors for monitoring
* LE flap and slat sensors for position indication, monitoring,
and LE cruise depressurization
* Proximity switch electronics unit (PSEU) for a ground signal
to reset a TE skew or asymmetry
* Stall management yaw damper (SMYD) 1 and 2 to inhibit the
LE FLAPS TRANSIT light during an autoslat command.
The FSEU sends analog signals to these components/systems:
* TE flap load relief solenoid
* TE flap bypass valve
* TE flap position indicator
GUN 201-999
* FLAP LOAD RELIEF light
GUN ALL
* LE cruise depressurization valve
* LE UCM shutoff valve
* LE devices annunciator panel
* LE FLAPS EXT light
* LE FLAPS TRANSIT light
* Main rudder power control unit (PCU) for the rudder load
limiter function
* Air conditioning system to operate the right ram air actuator
* Proximity sensor electronic unit (PSEU) for the takeoff
warning system
* Ground proximity module for ground proximity warning
TE FLAP SYSTEM - FLAP/SLAT ELECTRONICS UNIT (FSEU)
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-005
* SMYDs for takeoff warning.
The FSEU has ARINC 429 interfaces with these components:
* Air data inertial reference unit (ADIRU) for airspeed data for
TE flap load relief, TE and LE UCM inhibit, reset of TE skew
and asymmetry, and the rudder load limiter command
* Flight data acquisition unit (FDAU) to send flap lever position,
TE flap position, and LE flap and slat position to the flight
data recorder
* Display electronics units (DEUs) 1 and 2 for flap lever
position data for flap extension and retraction speed
indications.
TE Flap Position Indication
The FSEU receives inputs from the TE flap position transmitters
to operate the TE flap position indicator. The FSEU also sends
this data to other airplane systems.
See the TE flap position indication section for more information.
(SECTION 27-58)
TE Flap Load Relief
The flap load relief function prevents damage to the TE flaps
and their support structures from large aerodynamic loads. The
FSEU receives inputs from the ADIRU for the flap load relief
function. If the TE flaps are in the 30 or 40 position and the
airspeed is more than the limit for the flap position, the FSEU
supplies a ground for the flap load relief solenoid. This causes
the TE flaps to retract to the next lower flap position.
GUN 201-999
When the FSEU sends a flap load relief command, the amber
FLAP LOAD RELIEF light comes on.
GUN ALL
TE Flap Skew and Asymmetry Detection
The FSEU receives inputs from the TE flap skew sensors and
position transmitters to monitor the alignment of the TE flaps. If
the TE flaps do not stay in alignment, the FSEU operates the
bypass valve. This stops the hydraulic operation of the TE flaps.
During a flap skew, the FSEU also causes a change in the TE
flap position indicator.
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