King Air C90GTi, Руководство по подготовке пилотов

Страница: 188 / 557

propeller r pm and reset either gover nor as
r e q u i r e d . P r o p e l l e r r p m a n d p o s i t i o n i s
sensed by a magnetic pickup mounted ad-
jacent to each propeller spinner bulkhead.
This magnetic pick-up will transmit elec-
trical pulses once per revolution to a control
box installed forward of the pedestal.
The control box conver ts any pulse rate dif-
ferences into cor rection commands, which
are transmitted to coils mounted close to the
f ly we i g h t s o f e a c h p r i m a r y g ove r n o r. B y
varying the coil voltage, the governor speed
settings are biased until the prop r pm’s ex-
actly match. A toggle switch installed ad-
jacent to the synchroscope tur ns the system
on. In the synchrophaser OFF position, the
gover nors operate at the manual speed set-
tings selected by the pilot. To operate the
synchrophaser system, synchronize the pro-
pellers manually or establish a maximum of
10 r pm difference between the engines, then
tur n the synchrophaser on. The system may
be on for takeoff and landing.
To change r pm with the system on, adjust
both propeller controls at the same time. If
the synchrophaser is on but does not adjust
t h e p r o p r p m t o m a t c h , t h e s y s t e m h a s
reached the end of its range. Increasing the
setting of the slow prop, or reducing the set-
ting of the fast prop, will bring the speeds
within the limited synchrophaser range. If
p r e f e r r e d, t u r n t h e s y n c h r o p h a s e r sw i t c h
off, resynchronize manually, and tur n the
synchrophaser on.
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
7-43
FOR TRAINING PURPOSES ONLY
7
POWERPLANT
L PRIMARY
GOVERNOR
L PROP R PROP
R PRIMARY
GOVERNOR
PROP SYNC
5A
ON
OFF
CONTROL
BOX
RPM AND PHASE RPM AND PHASE
Figure 7-40. Propeller Synchrophaser