TM 55-1510-220-10
b. A pilot must be seated at the controls with the
seat belt fastened when the autopilot is in operation.
c. Operation of the autopilot and yaw damper is
prohibited during takeoff and landing, and below 200 feet
above terrain. Maximum speed for autopilot operation is
247 knots/0.47 Mach.
d. During a coupled ILS approach do not operate
the propellers in the 1750 to 1850 RPM range.
5-10. FUEL SYSTEM LIMITS.
NOTE
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 10 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 gasoline above 20,000 feet.
b. Fuel Management. Auxiliary tanks will not be
filled for flight unless the main tanks are full. Maximum
allowable fuel imbalance is 1000 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.
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 temperatures. 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.
The following limitations apply to the brake deice
system:
a. The brake deice system shall not be operated at
ambient temperatures above 150 C.
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.
c. Maintain 85% 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 deice system.
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. PILOT HEAT LIMITATIONS.
Pilot heat should not be used for more than 15
minutes while the aircraft is on the ground.
5-5
