Flaps and Slats (Contd.)
Mechanical gates hinder inadvertent FLAP lever movement beyond flaps 1 for one engine
inoperative go–around and flaps 15 for normal go–around. Indicator lights on the center
instrument panel provide overall LE devices position status. The LE DEVICES annunciator
panel on the aft overhead panel indicates the positions of the individual flaps and slats.
Flap Load Relief
The flaps/slat electronics unit (FSEU) provides a TE flap load relief function which protects
the flaps from excessive air loads. This function is operative at the flaps 30 and flaps 40
positions only. The FLAP lever does not move, but the flap position indicator displays flap
retraction and re–extension.
When the flaps are set at 40, the TE flaps: (700/800/900)
- Retract to 30 if airspeed exceeds 163 knots.
- Re–extend when airspeed is reduced to approximately 157 knots or below.
When the flaps are set at 30, the TE flaps: (700/800/900)
- Retract to 25 if the airspeed exceeds 176 knots.
- Re–extend when airspeed is reduced to approximately 170 knots or below.
Option - The FLAP LOAD RELIEF light illuminates when the TE flap load relief function
is activated.
