Specifications

SECTION IV
OPERATING INFORMATION
MODEL 560
COLD WEATHER OPERATIONS
COLD SOAK
Operation of the airplane has been demonstrated after prolonged exposure to ground ambient
temperature of -40°C (-40°F). This was the minimum temperature achieved in cold weather testing. The
following operational procedures are recommended or required for operations where prolonged exposure to
ground ambient temperatures below -10°C (+14°F) is anticipated or has occurred:
1. Preflight:
a. Battery warmup to at least -10°C (+14°F) is required. Battery temperature may be checked
with the battery temperature gage. Proper battery warmup may require extended application
of heat to the battery.
b. Brake accumulator charge may be below the grey band (675 psi). The needle must,
however, indicate above the lower stop (peg). If this cannot be visibly verified by the flight
crew, the airplane must be serviced prior to flight.
c. After two hours (or longer) of exposure, cabin temperature must be held at or above 0°C
(+32°F) for a minimum of 15 minutes prior to takeoff. This temperature ensures proper
deployment and operation of the passenger oxygen masks. Cabin temperature can be
determined using a handheld thermometer, or with the cockpit cabin temperature indicator, if
installed. If using a handheld thermometer, the temperature should be taken in the middle of
the cabin across from the cabin door. Heating the cabin may be accomplished with either of
the following methods:
(1) Engine Bleed Air - Increase engine thrust setting above idle (
f 65% N
2
) to achieve
higher cabin heat supply duct temperatures. Select the cockpit/cabin environmental
TEMPERATURE CONTROL knob to MANUAL and the MANUAL toggle switch to full
HOT, and the AIR FLOW DISTR to CABIN.
NOTE
Thrust settings above idle may require repositioning the airplane to a suitable ramp
location, and depending on the severity of the cold soak, greater than one hour of
engine operation. Be aware of fuel consumption.
(2) Pre-Heat - Utilize a high output (BTU) external heater to directly heat the cabin. Care
should be exercised as much as possible to heat the cabin uniformly.
I 4-26 Configuration AA 56OMB-01