Flaps and Slats
The flaps and slats are high lift devices that increase wing lift and decrease stall
speed during takeoff, low speed maneuvering and landing. LE devices consist of
four flaps and eight slats: two flaps inboard and four slats outboard of each
engine. Slats extend to form a sealed or slotted leading edge depending on the
TE flap setting. The TE devices consist of double slotted flaps inboard and
outboard of each engine. TE flap positions 1–15 provide increased lift; positions
15–40 provide increased lift and drag. Flaps 15, 30 and 40 are normal landing
flap positions. Flaps 15 is normally limited to airports where approach climb
performance is a factor.
Flap and Slat Sequencing
LE devices and TE flaps are normally extended and retracted by hydraulic power
from system B. When the FLAP lever is in the UP detent, all flaps and LE devices
are commanded to the retracted or up position. Moving the FLAP lever aft allows
selection of flap detent positions 1, 2, 5, 10, 15, 25, 30 or 40. The LE devices
deployment is sequenced as a function of TE flaps deployment.
When the FLAP lever is moved from the UP position to the 1, 2, or 5 position, the
TE flaps extend to the commanded position and the LE:
When the FLAP lever is moved beyond the 5 position the TE flaps extend to the
commanded position and the LE:
The LE devices sequence is reversed upon retraction.
The flaps and slats are high lift devices that increase wing lift and decrease stall
speed during takeoff, low speed maneuvering and landing. LE devices consist of
four flaps and eight slats: two flaps inboard and four slats outboard of each
engine. Slats extend to form a sealed or slotted leading edge depending on the
TE flap setting. The TE devices consist of double slotted flaps inboard and
outboard of each engine. TE flap positions 1–15 provide increased lift; positions
15–40 provide increased lift and drag. Flaps 15, 30 and 40 are normal landing
flap positions. Flaps 15 is normally limited to airports where approach climb
performance is a factor.
Flap and Slat Sequencing
LE devices and TE flaps are normally extended and retracted by hydraulic power
from system B. When the FLAP lever is in the UP detent, all flaps and LE devices
are commanded to the retracted or up position. Moving the FLAP lever aft allows
selection of flap detent positions 1, 2, 5, 10, 15, 25, 30 or 40. The LE devices
deployment is sequenced as a function of TE flaps deployment.
When the FLAP lever is moved from the UP position to the 1, 2, or 5 position, the
TE flaps extend to the commanded position and the LE:
- Flaps extend to the full extended position and
- slats extend to the extend position.
When the FLAP lever is moved beyond the 5 position the TE flaps extend to the
commanded position and the LE:
- Flaps remain at the full extended position and
- slats extend to the full extended position.
The LE devices sequence is reversed upon retraction.
