Specifications

SECTION IV
OPERATING INFORMATION
MODEL 560
FLIGHT INTO ICING
Flight into known icing is the intentional flight into icing conditions that are known to exist by either
visual observation or pilot weather report information. Icing conditions exist any time the indicated RAT is
+10°C (+50°F) and below, and visible moisture in any form is present. This airplane, with properly
operating anti-ice and deice equipment, is approved to operate in maximum intermittent and maximum
continuous icing conditions as defined by 14 CFR 25, Appendix C. The equipment has not been designed
to provide protection against freezing rain or severe conditions of mixed or clear ice. During all operations,
the pilot is expected to exercise good judgement and be prepared to alter the flight plan, i.e. exit icing, if
conditions exceed the capability of the aircraft and equipment.
Ice accumulations significantly alter the shape of airfoils and increase the weight of the aircraft. Flight
with ice accumulated on the aircraft will increase stall speeds and alter the speeds for optimum
performance. Flight at high angle-of-attack (low airspeed) can result in ice building on the underside of the
wings and the horizontal tail aft of areas protected by boots or leading edge anti-ice systems. Minimum
airspeed for sustained flight in icing conditions (except approach and landing) is 160 KIAS. Prolonged flight
with the flaps and/or landing gear down is not recommended. Trace or light amounts of icing on the
horizontal tail can significantly alter airfoil characteristics which will affect stability and control of the aircraft.
Freezing rain and clear ice will be deposited in layers over the entire surface of the airplane and can
“runback” over the surface before freezing. Runback ice is normal under the right icing conditions. This
can occur during prolonged exposure in moderate or heavy icing when the wing temperature (fuel
temperature) is below freezing. This is typical of most bleed air heated wings and no adjustment to
approach speed is required. Rime ice is an opaque, granular and rough deposit of ice that usually forms on
the leading edges of wings, tail surfaces, pylons, engine inlets, antennas, etc.
ANTI-ICE ADDITIVES
PROCEDURE FOR ADDING ETHYLENE GLYCOL MONOMETHYL ETHER (EGME) FUEL
ADDITIVE
Use the following procedure to blend anti-icing additive as the airplane is being refueled through the
wing filler caps:
1. Attach MIL-I-27686 additive to refuel nozzle, making sure blender tube discharges in the refueling
stream.
2. Start refueling while simultaneously fully depressing and slipping ring over trigger of blender.
WARNING
ANTI-ICING ADDITIVES CONTAINING ETHYLENE GLYCOL MONOMETHYL
ETHER (EGME) ARE HARMFUL IF INHALED, SWALLOWED OR ABSORBED
THROUGH THE SKIN, AND WILL CAUSE EYE IRRITATION. ALSO, IT IS
COMBUSTIBLE. BEFORE USING THIS MATERIAL, REFER TO ALL SAFETY
INFORMATION ON THE CONTAINER.
CAUTION
ASSURE THAT THE ADDITIVE IS DIRECTED INTO THE FLOWING FUEL STREAM
AND THAT THE ADDITIVE FLOW IS STARTED AFTER THE FUEL FLOW STARTS
AND IS STOPPED BEFORE FUEL FLOW STOPS. DO NOT ALLOW
CONCENTRATED ADDITIVE TO CONTACT COATED INTERIOR OF FUEL TANK OR
AIRPLANE PAINTED SURFACE. USE NOT LESS THAN 20 FLUID OUNCES OF
ADDITIVE PER 156 GALLONS OF FUEL OR MORE THAN 20 FLUID OUNCES OF
ADDITIVE PER 104 GALLONS OF FUEL.
I 4-24 Configuration AA 56OMB-01