5-9. AUTOPILOT LIMITATIONS.
The RC-12H aircraft is certified with wingtip
pods installed. Should the pods be removed,
the autopilot system must be replaced with a
standard C-12D autopilot. Affected wiring must
also be changed.
Fuel Management. Auxiliary tanks will not be
filled for flight unless the main tanks are full. Maximum
allowable fuel imbalance is 400 lbs. Do not take off if
fuel quantity gages indicate in yellow arc (less than 265
lbs. of fuel in each main tank). Crossfeed only during
single engine operation.
An autopilot preflight check must be. conducted
and found satisfactory prior to each flight on which the
autopilot is to be used.
A pilot must be seated at the controls with the
seat belt fastened when the autopilot is in operation.
c. Fuel System Anti-Icing. Icing inhibitor
conforming to MIL-I-27686 will be added to
commercial fuel, not containing an icing inhibitor,
during fueling operations, regardless of ambient
The additive provides anti-icing
protection and also functions as a biocide to kill
microbial growth in aircraft fuel systems.
5-11. BRAKE DEICE LIMITATIONS.
Operation of the autopilot and yaw damper is
prohibited during takeoff and landing, and below 200
The following limitations apply to the brake deice
feet above terrain. Maximum speed for autopilot
operation is 243 KIAS/O.47 Mach.
The brake deice system shall not be operated at
During a coupled ILS approach do not operate
ambient temperatures above 15°C.
the propellers in the 1750 to 1850 RPM range.
b. The brake deice system shall not be operated
longer than 10 minutes (one timer cycle) with the
landing gear retracted. If operation does not
automatically terminate approximately 10 minutes after
gear retraction, turn the brake deice switch OFF.
5-10. FUEL SYSTEM LIMITS.
Aviation gasoline (AVGAS) contains a form of
lead which has an accumulative adverse effect
on gas turbine engines. The lowest octane
AVGAS available (less lead content) should be
used. If any AVGAS is used the total operating
time must be entered on DA Form 2408-13.
a. Operating Limits. Operation with FUEL
PRESS light on is limited to IO hours. Log FUEL
PRESS light on time on DA Form 2408-13. One
standby boost pump may be inoperative for takeoff.
(Crossfeed fuel will not be available from the side with
the inoperative standby boost pump.) Operation on
aviation gasoline is time limited to 150 hours between
engine overhaul and altitude limited to 20,000 feet with
one standby boost pump inoperative. Crossfeed
capability is required for climb, when using aviation
N1 or higher during
simultaneous operation of the brake deice and surface
deice systems. If adequate pneumatic pressure cannot
be provided for simultaneous operation of the brake
deice and surface deice systems, turn OFF the brake
d. In order to maintain an adequate supply of
systems pneumatic bleed air, the brake deice system
shall be turned OFF during single engine operation.
5-12. PITOT HEAT LIMITATIONS.
Pitot heat should not be used for more than 15
minutes while the aircraft is on the ground.
gasoline above 20,000 feet.
Change 4 5-5