Cessna 1971 Super Skymaster - Page 15

PROPELLER SYNCHROSCOPE.
An electrically-operated synchroscope is installed to allow more
accurate propeller synchronization. The synchroscope, located on the
left upper portion of the instrument panel provides a visual indicator for
synchronization. The system utilizes a transmitter electrically connect-
ed in parallel with the dual engine tachometers, and electrical pick-up
coils mounted on the right magneto of each engine. The individual signals
on each magneto are compared in the synchroscope transmitter and their
variation in electrical phase is displayed by the sweeping pointer on the
synchroscope. A large variation in electrical phase (caused by RPM
differential between engines) causes a rapid oscillation of the pointer. As
the RPM of the engines
are more closely adjusted, pointer oscillation will
slow until finally, with
properly synchronized engines, pOinter motion is
minimal. When synchronizing engine RPM, either engine RPM may be
established as a "master, " and the other engine synchronized to match it.
WING FLAP SYSTEM.
Wing flap settings are accomplished in one Simple up or down move-
ment of the wing flap control knob to the flap setting deSired. To extend
the wing
flaps from "UP" to "1/3" down (normal take-off range), merely
push the control knob down until it hits the mechanical stop. For flap
settings greater than" 1/3" down, move the control knob to the right to
clear the stop, and position it as desired. To retract the flaps, Simply
raise the control knob to the setting deSired, Flap positiOns are identi-
fied as "UP, " "1/3, " "2/3" and "FULL. " The "FULL" flap position is 25
degrees.
flaps are retracted, the interconnect will automatically rotate the trim
wheel back to the "TAKE-OFF" range.
COWL FLAP SYSTEM.
Two three-pOSition toggle switches located on the left switch and con-
trol panel near the landing gear handle operate the front and rear engine
cowl
flaps. The switches are labeled "COWL FLAPS, ff ilFRONT" and
"REAR, " and
their pOSitions are labeled "OPEN" (up), "OFF" (center)
and "CLOSE" (down).
Two blue indicator lights, one located beside each
switch, illuminate when the cowl flaps have reached either the full open
or full closed position and remain lighted until the switches are placed in ,
the "OFF" pOSition. The indicator lights also incorporate dimming 1[' .
shutters for night operation. I"
Ii
To fully open or close the cowl flaps, place the cowl flap switches in ;1 j
either the "OPEN" or "CLOSE" position. When the opening or closing
operation is completed (approximately two seconds) the blue indicator
lights will illuminate. If intermediate positioning of the cowl flaps is re-
quired, for example half open, actuate the switches for approximately one
second and return them to the "OFF" position. Other settings can be ap-
proximated in a similar manner. Proper cowl flap settings should be de-
termined by carefully monitoring the cylinder head temperature gages.
LANDING GEAR SYSTEM.
WING FLAP-ELEVATOR TAB INTERCONNECT SYSTEM.
The wing flap system is mechanically interconnected with the elevator
trim tab system to automatically eliminate excessive nose-up trim while
the wing
flaps are being retracted.
With the flaps retracted, the trim control wheel can be rotated in one
direction until the trim position indicator reaches the "NOSE DN" position,
or In the opposite direction until it reaches the lower half of the "TAKE-
OIrF"
range marking for nose-up trim. As the flaps are extended, addi-
tional nose-up trim beyond the "TAKE-OFF" range can be utilized. Maxi-
mum nose-up trim is available when the flaps are fully extended. As the
The
retractable tricycle landing gear is extended and retracted by
hydraulic actuators, powered by an engine-driven hydraulic pump on the
front engine. An optional engine-driven hydraulic pump is offered for
the
rear engine to provide decreased gear operation time and dual pump
safety.
Two pOSition indicator lights show that the gear is either up or down
and locked. The lights are "press-to-test" type. The gear-down indica-
tor llght (green) has two test positions; with the light pushed in half-way
and either throttle retarded, the gear warning horn should sound, and
with the light pushed full in, the light should illuminate. The gear-up
indicator light (amber) has only one test poSition; with the light pushed
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