King Air C90GTi, Pilot Training Manual

Page: 296 / 557

Each normally closed, up-position switch is
l o c a t e d i n t h e u p p e r p o r t i o n o f i t s
respective wheel well. When the gear is in
t h e f u l l y r e t r a c t e d p o s i t i o n , e a c h s t r u t
actuates its respective up-position switch
to open the circuit from the in-transit light
to g round. As soon as the gear moves from
t h e f u l l y r e t r a c t e d p o s i t i o n , e a c h s t r u t
actuates its respective up-position switch
to illuminate the in-transit light by provid-
ing a path to g round through the down-po-
sition switch. The in-transit light goes out
when the drag brace in each landing gear
passes over-center to actuate its respective
down-position switch to the momentary con-
tacts. In this position, the switch opens the
circuit to the in-transit light and completes
a path to ground for the down-position lights.
The down-position switch on each landing
gear also functions as a war ning switch for
the system.
The landing gear in-transit light will indi-
cate one or all of the following conditions:
• Landing gear handle is in the UP po-
s i t i o n , a n d t h e a i r p l a n e i s o n t h e
g r o u n d w i t h we i g h t o n t h e l a n d i n g
gear.
• With flaps up or approach and one or
both power levers retarded below ap-
proximately 79 ±2% N
1
, one or more
landing gears are not down and locked.
• Any landing gear is not in the fully re-
tracted position.
• Flaps are beyond the APPROACH po-
s i t i o n ( 3 6 % o r m o r e ) w i t h a ny g e a r
not down, regardless of power lever
position.
Thus, the function of the landing gear in-
transit light is to indicate that the landing
gear is in transit.
The up indicator, down indicator, and warn-
ing hor n systems are essentially indepen-
d e n t s y s t e m s . A m a l f u n c t i o n i n a ny o n e
system will probably leave the other two
systems unaffected.
LANDING GEAR WARNING
SYSTEM
The landing gear warning system is provided
to warn the pilot that the landing gear is not
d ow n a n d l o c k e d d u r i n g s p e c i f i c f l i g h t
regimes. Various warning modes result, de-
pending upon the position of the flaps.
With the flaps in the UP or APPROACH po-
sition and either or both power levers re-
t a r d e d b e l ow a b o u t 7 9 % N
1
, t h e wa r n i n g
horn will sound intermittently. The horn can
be silenced by pressing the GEAR WARN
SILENCE button adjacent to the LDG GEAR
CONTROL switch handle. On the C90GTi
and C90GTx, the war ning hor n is silenced
by pressing the silence button located on the
left power lever. The landing gear war ning
system will be rear med if the power levers
are advanced suff iciently.
With the FLAPS beyond the APPROACH
p o s i t i o n , t h e wa r n i n g h o r n a c t iva t e s r e -
gardless of the power lever settings and can-
not be canceled.
L a n d i n g g e a r wa r n i n g h o r n o p e r a t i o n i s
shown in Table 14-1 below.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
14-11
FOR TRAINING PURPOSES ONLY
14
LANDING
GEAR
AND
BRAKES
GEAR POSITION FLAPS POWER HORN SILENCE MODE
Up Up +77 to 81% No N/A
Up Up –77 to 81% Yes Silence button
Up Approach –77 to 81% Yes Silence button
Up Past approach Any Yes Lower gear
Table 14-1. LANDING GEAR WARNING HORN OPERATION