King Air C90GTi, Pilot Training Manual

Page: 167 / 557

T h e N
1
i n d i c a t o r i s s e l f - g e n e r a t i n g . T h e
tachometer generator sensing unit, located
i n t h e e n g i n e a c c e s s o r y s e c t i o n , i s g e a r e d
d ow n t o s u p p ly N
1
s p e e d i n f o r m a t i o n t o
t h e i n s t r u m e n t p a n e l t o i n d i c a t e t h e p e r -
c e n t o f N
1
r evo l u t i o n s .
Maximum continuous gas generator speed
is limited to 38,100 r pm, which is 101.5%
on the N
1
indicator. A transient speed up
to 102.6%, 38,500 r pm, is time-limited to
2 s e c o n d s , t o p r ov i d e a b u ff e r f o r s u rg e s
during engine acceleration.
CONTROL PEDESTAL
T h e c o n t r o l p e d e s t a l e x t e n d s b e t we e n
pilot and copilot (Figure 7-22). The three
sets of control levers are left to right: the
p owe r l e v e r s , p r o p e l l e r l e v e r s , a n d t h e
condition levers.
Power Levers
T h e p owe r l ev e r s ( F i g u r e 7 - 2 0 ) c o n t r o l
e n g i n e p o w e r , f r o m i d l e t o m a x i m u m
p owe r, by o p e r a t i o n o f t h e N
1
g ove r n o r i n
t h e f u e l c o n t r o l u n i t . I n c r e a s i n g N
1
r p m
r e s u l t s i n i n c r e a s e d e n g i n e p owe r. T h e
p owe r l ev e r s h av e t h r e e c o n t r o l r a n g e s :
f l i g h t , B e t a , a n d r eve r s e . T h e b o t t o m o f
t h e f l i g h t r a n g e i s a t I D L E . W h e n t h e
l eve r s a r e l i f t e d ove r t h e I D L E d e t e n t a n d
p u l l e d b a c k , t h e y c o n t r o l e n g i n e p owe r
t h r o u g h t h e G R O U N D F I N E a n d R E -
V E R S E r a n g e s .
Condition Levers
T h e c o n d i t i o n l eve r s h ave m u l t i p l e p o s i -
t i o n s : F U E L C U T O F F a n d L O I D L E
t h r o u g h H I I D L E ( F i g u r e 7 - 2 2 ) . A t t h e
FUEL CUTOFF position, fuel flow to its re-
spective engine is cut off.
At LO IDLE, engine gas generator speed (N1)
is a minimum of 58%; at HI IDLE it is 70%.
The levers can be set anywhere between LOW
IDLE and HIGH IDLE.
Propeller Levers
The propeller levers are conventional in set-
ting the propeller r pm for takeoff, climb and
cruise (Figure 7-22). The normal governing
range is 1,600 to 1,900 r pm. This air plane is
equipped with both manual and automatic
propeller feathering systems. To feather a
propeller manually, pull the propeller lever
back past the friction detent into the red and
white striped section of the quadrant. To un-
feather, push the lever forward of the detent
into the governing range. The propellers go
to feathered position when the engines shut
down because of the loss of oil pressure in the
propeller dome.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
7-22
FOR TRAINING PURPOSES ONLY
7
POWERPLANT
Figure 7-22. Control Pedestal