King Air C90GTi, Pilot Training Manual

Page: 200 / 557

is derived from the hot batter y bus. The de-
tection system is operable whenever the gen-
erator buses are active. But the extinguishing
system can be discharged at any time, since
i t i s o p e r a t e d f r o m t h e h o t b a t t e r y b u s .
Therefore, even though the air plane may be
parked with the engines off, the f ire extin-
guishing system may be discharged.
Each push-to-actuate switch incor porates
three indicator lenses. The red lens, plac-
a r d e d L ( o r ) R E N G F I R E E X T – P U S H ,
war ns of the presence of f ire in the engine.
The amber lens, placarded D, indicates that
the system has been discharged and the sup-
ply cylinder is empty. The g reen lens, plac-
arded OK, is provided only for the preflight
test function.
To discharge the car tridge, raise the break-
away wired clear plastic cover and press the
face of the lens. This is a one-shot system
and will be completely expended upon ac-
tivation. The amber D light will illuminate
and remain illuminated, regardless of battery
switch position, until the pyrotechnic car-
tridge has been replaced.
FIRE EXTINGUISHER TEST
SYSTEM
The f ire extinguisher system test functions,
i n c o r p o r a t e d i n t h e r o t a r y T E S T
SWITCH–FIRE DET & FIRE EXT, test the
circuitr y of the f ire extinguisher system.
During preflight, the pilot should rotate the
TEST SWITCH to each of the two positions
(RIGHT EXT and LEFT EXT) and verify
the illumination of the amber D light and
the green OK light on each f ire-extinguisher
a c t iva t i o n sw i t c h b e l ow t h e g l a r e s h i e l d .
Illumination during this check indicates that
the bottle charge detector circuitry and squib
f iring circuitr y are operational and that the
squib is in place.
A gage, (Figure 8-3) calibrated in psi, is
provided on each supply cylinder for de-
t e r m i n i n g t h e l eve l o f c h a rg e . T h e ga g e s
s h o u l d b e c h e c ke d d u r i n g p r e f l i g h t . T h e
cylinder and gages are located in the main
wheel wells.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
8-5
FOR TRAINING PURPOSES ONLY
8
FIRE
PRO
TECTION
Figure 8-3. Fire Extinguisher Cylinder
Pressure Gage