•
As flight spoilers, only the two outboard spoilers on each wing (a
total of four spoiler panels) can be used in conjunction with the
ailerons to increase the rate of roll of the aircraft
Flight spoilers deploy upward on the side of the upward displaced aileron to
contribute to the decrease in lift on the downward rolling wing. By
interrupting additional airflow over the wing on the inside of a turn, roll rate
into the turn is increased. Spoilers are activated by the same cable linkage
that controls aileron deployment. A bellcrank in the aileron cables on the aft
wing beam provides an input to a mixing and summing series of pushrods
and hinges to provide a mechanical command to the hydraulic actuator for
the two outboard spoiler panels.
The amount of flight spoiler extension is proportional to aileron
displacement. Maximum aileron displacement is eleven degrees (11°) from
neutral and maximum flight spoiler extension is forty-seven degrees (47°)
up from the faired position. The following table shows examples of the
aileron / flight spoiler displacement ratio:
Aileron Displacement
Flight Spoiler Extension
Up one half degree (+½°)
Up one half degree (+½°)
Up one degree (+1°)
Up five and one half degrees (+5.5°)
Up seven degrees (+7°)
Up twenty-eight degrees (+28°)
Up eleven degrees (+11°)
Up forty-seven degrees (+47°)
If the spoilers are in use as speed brakes, all three spoiler panels on each
wing can be extended up to thirty degrees (30°) with commands from the
speed brake control handle on the cockpit center pedestal. If a turn is
initiated with speed brakes extended, the two outboard spoiler panels on
the downward rolling wing will extend an additional amount up to fifty-five
degrees (55°) to increase the roll rate into the turn.
Malfunctions in the spoiler system are controlled by selecting the spoilers
off. There is no manual extension provision for spoilers. A SPOILER
CONTROL pushbutton is installed in the cockpit center pedestal just
forward of the speedbrake handle, as shown in Figure 12. Pushing the
button in will bypass all hydraulic pressure to the spoilers and illuminate the
amber OFF legend on the face of the button.
3. Controls and Indications:
(See Figure 12.)
NOTE:
A full description of the Flight Controls 2/3 synoptic
page appears in section 2B-07-00.
A. Circuit Breakers (CBs):
The following circuit breakers protect the aileron and flight spoiler roll
controls:
Circuit Breaker Name:
CB Panel:
Location:
Power Source:
LEFT AIL HYD S/O
POP
C-4
L ESS DC Bus
RIGHT AIL HYD S/O
CPOP
C-4
R ESS DC Bus
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS
2A-27-00
Page 40
August 14/03
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