King Air C90GTi, Pilot Training Manual

Page: 135 / 557

engine has an average fuel consumption of
40 gallons per hour, each time 40 gallons of
aviation gasoline are added, one hour of the
150 hour limitation is being used. In other
words, using the 40 gph consumption rate as
an example, the engine is allowed 6000 gal-
lons of aviation gasoline between overhauls.
If the tanks have been ser viced with avia-
tion gas, flights are limited to 8,000 feet
pressure altitude or below with the boost
pumps inoperative. Because it is less dense,
aviation gas delivery is much more critical
than jet fuel delivery. Aviation gas feeds well
under pressure feed but does not feed well
on suction feed, par ticularly at high alti-
tudes. For this reason, an alternate means of
pressure feed must be available for aviation
gas at high altitude. This alternate means is
crossfeed from the opposite side. Thus, a
crossfeed capability is required for climbs
above 8,000 feet pressure altitude. These
limitations are found in the Limitations sec-
tion of your
Pilot’s Operating Handbook .
The POH lists three approved fuel additives.
A n y a n t i - i c i n g a d d i t i v e c o n f o r m i n g t o
Specif ication MIL-I-27686 or MIL-I-85470
is approved as is the fuel biocide-fungicide
Biobor
®
JF. Each additive may be used as
the only fuel additive or they may be used
together. It has been deter mined that, used
together, the additives have no detrimental
effect on the fuel system components.
Additive concentrations and blending pro-
c e d u r e s a r e f o u n d i n t h e
K i n g A i r 9 0
Maintenance Manual .
The FUEL BRANDS AND TYPE DESIG-
NATIONS char t in the Handling, Ser vice &
Maintenance section of the
POH gives the
fuel ref iner’s brand names, along with the
cor responding designations established by
the American Petroleum Institute (APT) and
the American Society of Testing Material
( A S T M ) . T h e b r a n d n a m e s a r e l i s t e d f o r
ready reference and are not specif ically rec-
ommended by Beech Aircraft Cor poration.
A n y p r o d u c t c o n f o r m i n g t o t h e r e c o m -
mended specif ication may be used.
FILLING THE TANKS
When f illing the aircraft fuel tanks, always
obser ve the following:
1. M a k e s u r e t h e a i r c r a f t i s s t a t i c a l l y
g rounded to the ser vicing unit and to
the ramp.
2. Ser vice the nacelle tank on each side
f irst. The nacelle tank f iller caps are
located at the top of each nacelle. The
w i n g t a n k f i l l e r c a p s a r e l o c a t e d i n
t h e t o p o f t h e w i n g , o u t b o a r d o f t h e
nacelles.
NOTE
Ser vicing the nacelle tanks f irst
prevents fuel transfer through the
g r av i t y f e e d i n t e r c o n n e c t l i n e s
from the wing tanks into the na-
celle tanks during fueling. If wing
t a n k s a r e f i l l e d f i r s t , f u e l w i l l
transfer from them into the nacelle
tank leaving the wing tanks only
partially f illed. Be sure the nacelle
tanks are completely full after ser-
v i c i n g t h e f u e l s y s t e m t o a s s u r e
proper automatic fuel transfer dur-
ing flight operation.
3. A l l ow a t h r e e - h o u r s e t t l i n g p e r i o d
whenever possible, then drain a small
amount of fuel from each drain point.
Check fuel at each drain point for con-
tamination.
DRAINING THE FUEL SYSTEM
Open each fuel drain daily to drain off any
water or other contamination collected in
the low places. Along with the drain on the
f irewall mounted fuel f ilter, there are four
o t h e r d r a i n s : t h e n a c e l l e t a n k f u e l - p u m p
d r a i n , c e n t e r- s e c t i o n t a n k t r a n s f e r- p u m p
drain, wheelwell drain, and the inboard end
of the outboard-wing tank drain.
The fuel pump and tank drains are accessi-
ble from the underside of the air plane.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
5-18
FOR TRAINING PURPOSES ONLY
5
FUEL
SY
STEM