Page 6-18
P/N 140-590032-0007
Revision A4: Sep, 2010
Section III Sub-section 6
FLIGHT CONTROLS
Pilot’s Operating Manual
A baulk, at the 15
°
slot, prevents inadvertent selection of the up, approach or landing positions. The
baulk is released by pushing the selector lever into the 15
°
slot in the gate. Additional movement of the
flaps downwards from the landing position to a lift dump position, is controlled by the airbrake selector
lever.
Power Supplies
The flap position indication is powered from PS1(a) busbar via circuit breaker FLAP POS (M/7) on panel
DA-D. The warning horn is powered from PE(a) busbar via circuit breaker HORN (K/1) on panel DA-D.
Emergency Operation
The flaps may be operated by means of the auxiliary hydraulic system. Using the auxiliary system the
flaps can be lowered to any pre-set position from 0
°
to 45
°
. Lift dump and airbrakes are not available.
The emergency flap selection is made using the normal flap control lever. Position indication is still
available as long as PS1(a) busbar is energized.
AIRBRAKE CONTROL SYSTEM (Figure 8)
A pair of airbrakes per wing are powered by the main hydraulic system. Of each pair, one airbrake
extends from the wing upper surface, the other one from the wing lower surface.
Control of the airbrakes is by means of an AIRBRAKE selector lever located on the center control
pedestal, immediately left of the thrust levers. The selector lever moves in a slot, which has a scale
marked with three positions of SHUT, OPEN and DUMP. The normal (flight and ground) operating range
is from the SHUT to the fully OPEN selections while intermediate positions are obtained by leaving the
selector lever at the required setting within the range.
AIR BRAKE
A
I
R
B
R
A
K
E
OPEN
DUMP
Center Control Pedestal
Airbrake Selector Lever
HORN
ISOLATE
1
2
Thrust Levers