King Air C90GTi, Pilot Training Manual

Page: 304 / 557

LANDING GEAR OPERATING
LIMITS
The landing gear operating limits are shown
in Table 14-2 above.
KING AIR WHEEL
BRAKES
T h e K i n g A i r s e r i e s b r a ke s a r e a n o n - a s -
s i s t e d hy d r a u l i c b r a ke s y s t e m . T h e m a i n
landing gear wheels are equipped with multi-
disc dual hydraulic brakes. These brakes are
actuated by toe pressure on the r udder ped-
als by either the pilot or copilot. The de-
pression of either set of pedals compresses
the piston rod in the master cylinder attached
to each pedal. The hydraulic pressure re-
sulting from the movement of the pistons in
the master cylinders is transmitted through
flexible hoses and f ixed aluminum tubing
t o t h e d i s c b r a ke a s s e m bl i e s o n t h e m a i n
landing gear wheels. This pressure forces
t h e b r a k e p i s t o n s o n t h e w h e e l t o p r e s s
against the multiple linings and discs of the
brake assembly.
As with any air plane, proper traction and
braking control cannot be expected until the
landing gear is car r ying the full weight of
the air plane. Use extreme care when brak-
ing to prevent skidding and the resulting flat
sections on tires caused by skidding. Braking
should be smooth and even all the way to the
end of g round roll.
SERIES BRAKE SYSTEM
T h e d u a l b r a k e s a r e p l u m b e d i n s e r i e s
(Figure 14-21). Each rudder pedal is attached
to its own master cylinder. The pilot’s mas-
ter cylinders are plumbed through the copi-
lot’s master cylinders, thus allowing either
set of pedals to perfor m the braking action.
The pilot’s and copilot’s right rudder pedals
control the brake in the right main landing
gear. Similarly, the pilot’s and copilot’s left
r u d d e r p e d a l s c o n t r o l b r a k i n g i n t h e l e f t
main gear. This ar rangement allows differ-
ential braking for taxiing and maneuvering
on the g round.
PARKING BRAKE
The parking brake utilizes the regular brakes
a n d a s e t o f va l ve s ( Fi g u r e 1 4 - 2 2 ) . D u a l
parking brake valves are installed adjacent
t o t h e r u d d e r p e d a l s b e t we e n t h e m a s t e r
cylinders of the copilot’s r udder pedals and
the wheel brakes. The two lever-type valves
are located just aft of the flight compar t-
ment under the center aisle floorboard. A
push-pull cable from the valve control levers
r u n s t o t h e p e d e s t a l , t e r m i n a t i n g w i t h a
knob. The control knob for the parking brake
v a l v e s , p l a c a r d e d “ PA R K I N G B R A K E -
PULL ON,” is below the lower left cor ner of
the pilot’s subpanel.
To set the parking brake: depress the brake
pedals to build up pressure in the brake sys-
tem, then depress the button in the center
of the parking brake control, and pull the
control handle aft or ON. This procedure
closes both parking brake valves simulta-
neously. The parking brake valves should
retain the pressure previously pumped into
the system.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
14-19
FOR TRAINING PURPOSES ONLY
14
LANDING
GEAR
AND
BRAKES
AIRSPEED KIAS REMARKS
Maximum landing gear operation (V
LO
) Do not extend or retract the landing
• Extension 182 gear above this speed.
• Retraction 163
Maximum Landing gear extended (V
LE
) 182 Do not exceed this speed with the
landing gear extended.
Table 14-2. LANDING GEAR OPERATING LIMITS