King Air C90GTi, Pilot Training Manual

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t h e D N p o s i t i o n ( Fi g u r e 1 4 - 1 9 ) . R e m ove
t h e p u m p h a n d l e f r o m t h e s e c u r i n g c l i p ,
and pump the handle up and down until the
green NOSE-L-R gear down indicator lights
i l l u m i n a t e . P l a c e t h e p u m p h a n d l e i n t h e
fully down position and secure in the re-
taining clip.
A f t e r a p r a c t i c e m a n u a l ex t e n s i o n o f t h e
landing gear, the gear may be retracted hy-
draulically by pushing the LANDING GEAR
RELAY circuit breaker in and moving the
LDG GEAR CONTROL switch handle to the
UP position.
If an alter nate landing gear extension be-
c o m e s n e c e s s a r y, t h e r e i s n o l i m i t t o t h e
amount of cycles the hydraulic gear may be
pumped. During a complete or partial elec-
trical failure, the gear down lights, in-tran-
sit lights, and gear warning horn may not be
operating. A positive method of checking
that the gear is down is through resistance
when pumping the extension handle. When
all three gears are extended, hydraulic pres-
sure is built up until the pressure relief valve
opens, relieving the pressure built up by the
handle. This can be felt by the pilot as in-
creased resistance while pumping, followed
by a give as the relief valve opens.
Landing Gear Maintenance
Retraction
A service valve (Figure 14-20), located for-
ward of the power pack assembly, may be
used in conjunction with the hand pump to
r a i s e t h e g e a r f o r m a i n t e n a n c e p u r p o s e s .
With the aircraft on jacks and an exter nal
electrical power source attached, unlatch
the hinged retainer and pull up on the red
knob located on top of the ser vice valve.
The hand pump can then be used to raise the
gear to the desired position. After the re-
q u i r e d m a i n t e n a n c e h a s b e e n p e r f o r m e d,
push the red knob down, and use the hand
pump to lower the gear. The valve is not ac-
cessible to the pilot.
If the red knob on the service valve
is pushed down while the landing
g e a r i s r e t r a c t e d, t h e e l e c t r i c a l
power on, and the landing gear con-
trol handle is in the down position,
th e lan d in g g ear will ex ten d im-
mediately.
A f ill reser voir, located just inboard of the
left nacelle and forward of the front spar,
contains a cap and dipstick assembly to fa-
c i l i t a t e m a i n t e n a n c e o f t h e s y s t e m f l u i d
level. A line plumbed to the upper por tion
of the f ill reser voir is routed overboard to
act as a vent.
TIRES
The nose landing gear wheel is equipped with
a 6.50 x 10, 6-ply-rated, tubeless, rim-infla-
tion tire. For the C90GTi, each main landing
gear wheel is equipped with an 8.50 x 10, 8-
ply-rated, tubeless, rim-inflation tire, unless
m o d i f i e d by S T C f o r t h e G r o s s We i g h t
Increase, thus requiring the 10-ply tires on
the mains.The C90GTx requires the 10-ply
tires on the Main. For increased service life,
10-ply-rated tires of the same size may be in-
s t a l l e d . C h e c k t h e
P i l o t ’s O p e ra t i n g
Handbook for cor rect tire pressure.
SHOCK STRUTS
Shock str uts should always be properly in-
flated. Do not over- or under-inflate, and
never tow or taxi an aircraft when any str ut
is flat. Cor rect inflation is approximately 3
inches for the main strut and 3.0 to 3.5 inches
for the nose str ut.
CAUTION
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
14-16
FOR TRAINING PURPOSES ONLY
14
LANDING
GEAR
AND
BRAKES