FSEU 1 (FSEU 2)

This test makes sure that FSEU 1 (FSEU 2) is operating correctly.
Slats Primary Control Valve Test-FSEU 1 (FSEU 2)

This test makes sure that FSEU 1 (FSEU 2) controls the slats primary control valve correctly. During this test, the slats will move.
Flaps Primary Control Valve Test-FSEU 1 (FSEU 2)

This test makes sure that FSEU 1 (FSEU 2) controls the flaps primary control valve correctly. During this test, the flaps will move.
Inboard Slat Skew Test-FSEU 1 (FSEU 2)
This test makes sure that FSEU 1’s (FSEU 2’s) inboard slat skew/loss sensors operate correctly. During this test, the slats will move.

EFFECTIVITY BEJ ALL  27-03-00 
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777 AIRCRAFT MAINTENANCE MANUAL

HIGH LIFT CONTROL -LRU REPLACEMENT TESTS

EFFECTIVITY BEJ ALL  27-03-00 
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D633W101-BEJ  Jan 05/2002 

HIGH LIFT CONTROL -SPECIAL FUNCTIONS

General

The secondary mode inhibit override function permits movement of the slats and flaps with the PDU electric motors while on the ground.
You can select which FSEU controls the flaps and slats when you use this function.
The FSEUs inhibit the secondary mode operation when the airplane is in a ground maintenance condition. Three conditions are necessary for the ground maintenance condition to occur. First, the center hydraulic system pressure must be low. Second, either:
*
The airplane is on the ground, or

*
The ground speed is less than 40 knots.

Third, either:

*
Both engines are not running, or

*
One engine is not running and external power is available.

Operation

When you use this function, the FSEUs permit the use of the PDU electric motors to move the flaps and slats. You can then use the flap lever to control the position of the flaps and slats.
EFFECTIVITY
BEJ ALL

After you enable the secondary mode inhibit override, you have 15 seconds to move the flaps and slats using the flap lever. After 15 seconds, the secondary mode inhibit override stops. If the surfaces are in motion when the inhibit override stops, the surfaces continue to move to the commanded position.
If you use the secondary mode inhibit override when there is no failure of the primary mode, the flaps and slats operate the same as the primary mode. The FSEU sends commands to the electric motors of the flaps and slats power drive units. The flaps/slats sequence is the same as in primary mode (slats sealed with flap lever position 1 through 20, slats gapped with flap lever position 25 and 30). The flaps/slats indication on the EICAS display shows the primary mode display.
If you use the secondary mode inhibit override when there is a failure of the primary mode, the flaps/slats operate the same as the secondary mode. The FSEU sends commands to the electric motors of the flaps and slats power drive units. The flaps/slats sequence is the same as in secondary mode (slats gapped with flap lever position 1 through 30). The flaps/slats indication on the EICAS display shows the secondary mode display.
For example, you could cause a failure of the primary mode if on the ground you move the flap lever with the center hydraulic system depressurized before you enable the secondary mode inhibit override.
27-03-00

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777 AIRCRAFT MAINTENANCE MANUAL

HIGH LIFT CONTROL -SPECIAL FUNCTIONS

EFFECTIVITY BEJ ALL  27-03-00 
Page 45 
D633W101-BEJ  Jan 05/2002 

AILERON AND FLAPERON CONTROL -INTRODUCTION

General

The ailerons and flaperons control the flight attitude of the airplane about the longitudinal axis. They also increase the wing lift with the high lift system during takeoff, approach and landing.
The ailerons are on the wing outboard trailing edge.

The flaperons are standard inboard ailerons which also operate as flaps. They are between the inboard and the outboard flaps on the wing trailing edge.
Roll Control

During roll control, the aileron and flaperon on one wing move up, and the aileron and flaperon of the other wing move down.
The pilots manually command a roll correction with the rotation of the control wheels. When engaged, the autopilot automatically commands the ailerons and the flaperons. During autopilot operation, actuators backdrive the control wheels.
The spoilers also supply roll control. See the spoiler and speedbrake control section for more information (SECTION 27-61).
EFFECTIVITY
BEJ ALL

Aileron Lockout
On the ground and during flight below cruise speed, the ailerons and flaperons are fully operational. At cruise speed, the ailerons fair to the wing surface and lock out. The flaperons supply roll control.
　
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