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General
For normal operation of the TE flaps, the flap lever makes the
command to the flaps and hydraulic power moves them. If
hydraulic power is not available, you can manually select
alternate operation. During alternate operation, the alternate
flaps switches make the command to the flaps and electrical
power moves them.
Normal Operation
Hydraulic system B power goes through a priority valve and a
flow limiter to the flap control unit. The priority valve gives
priority of hydraulic system B power to the LE devices over the
TE flaps. The flow limiter limits the speed of movement of the TE
flaps.
During normal operation, the flap lever makes the commands to
the TE flaps to move. The flap lever moves a cable system that
supplies a mechanical input to a flap control valve in the flap
control unit. The flap control valve sends system B hydraulic
power through the bypass valve to the flap power drive unit
(PDU). The PDU moves the flap drive system to move the TE
flaps. The PDU supplies a mechanical feedback to the flap
control valve as the flap drive system moves.
The flap PDU also supplies a mechanical input to the slat
control valve and the flap limit switches in the flap control unit.
See the LE flap and slat control section for more information on
the slat control valve. (SECTION 27-81)
The flap load relief function in the FSEU uses data from one of
the flap lever position switches and other systems. If the
airspeed is more than a limit, the FSEU sends a command to the
flap load relief solenoid on the TE flap control valve to retract
the TE flaps.
The TE flap skew and asymmetry functions use signals from the
flap position transmitters and the flap skew sensors to monitor
the alignment of the TE flaps. If the TE flaps do not stay in
alignment, the FSEU moves the bypass valve to the bypass
position. The bypass valve prevents hydraulic power to the flap
PDU and the TE flaps stop moving.
The TE flap UCM detection function uses data from the flap
skew sensors and the flap lever position sensor. If the TE flaps
move from their commanded position, the FSEU moves the
bypass valve to the bypass position to stop the TE flaps.
The flap position transmitters send signals to the FSEU which
sends this data to the flap position indicator in the flight deck.
The flap position data also goes to the flight control computers
(FCCs) and stall management yam dampers (SMYDs).
TE FLAP SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-002
Alternate Operation
During alternate operation, the alternate flaps switches send a
signal to move the bypass valve to the bypass position. The
bypass valve prevents a hydraulic lock on the PDU. The
alternate flaps switches also energize the alternate flap relays.
These relays supply electrical power to an electric motor on the
flap PDU. The PDU moves the flap drive system to move the TE
flaps.
The flap PDU supplies a mechanical feedback to the flap limit
switches as the flap drive system moves. The flap limit switches
remove electrical power from the relays when the flaps move to
a limit. This stops the TE flaps.
During alternate operation, the detection functions and the flap
load relief function in the FSEU are not available.
TE FLAP 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
27-51-00-002
TE FLAP SYSTEM - GENERAL DESCRIPTION
TE FLAP SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-51-00-002
General
These are the components of the TE flap drive system:
* Flap control unit
* Flap PDU
* Torque tubes
* Torque tube supports
* Angle gearboxes
* Transmissions
* Ballscrews
* Gimbals.
The flap drive system on the left wing is the same as the flap
drive system on the right wing. Many of the components are
interchangeable.
Flap Control Unit
There is one flap control unit. The flap control unit receives
commands from the flap lever cables during normal operation
and sends hydraulic power to the flap PDU. During alternate
operation, switches in the flap control unit limit the operation of
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