(6)
For continuing precipitation conditions, the two-step deicing/anti-icing procedure (as defined in paragraph 1.D.(4) is normally the preferred method. The percentage of fluid used in the mixture should be determined based on airline experience or the fluid manufacturer's recommendations and the atmospheric temperature.
(7)
Maintenance personnel must recognize that the requirement for an ice, snow, and frost free wing at takeoff can only be met by close inspection of the aircraft at the time of departure.
(8)
Snow should be removed from parked airplanes at regular intervals to prevent a large build-up, and possible freezing to the airplane surface.
(9)
Removal of snow may be facilitated by brushing snow from wings and horizontal stabilizers with long handled brooms. Fuselage can be cleared by use of ropes or fabric fire hose laid over fuselage and see-sawed aft over fuselage.
(10)
Prior to moving an airplane from heated hangar to an outside location during icing conditions, the airplane should be anti-iced. This reduces the possibility of ice or snow melting upon contact with the warm airplane and then refreezing.
(11)
Unheated water deicing should be accomplished in a heated hangar, if possible, and the airplane should remain in the hangar until the surfaces are dry. It will be necessary to check those areas where water could be trapped and freeze. Application of anti-icing fluid will minimize the drying requirements.
(12)
General Precautions
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CAUTION: PROTRUDING EQUIPMENT MAY BE DAMAGED BY MOVEMENT OF ROPES OR FABRIC HOSE.
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WARNING: DEICING/ANTI-ICING FLUID MAY BE TOXIC. CONTACT WITH SKIN OR EYES SHOULD BE AVOIDED AND ADEQUATE PROTECTIVE CLOTHING SHOULD BE WORN BY PERSONNEL.
(a)
Do not spray deicing/anti-icing fluid directly at or into pitot inlets, TAT probes or static ports.
(b)
Do not spray heated deicing/anti-icing fluid or hot water directly on cold windows.
(c)
Do not spray deicing/anti-icing fluid directly into engine, APU, scoops, vents, drains, etc.
(d)
Do not exceed 10 psi on an area of 25 square inches, and do not direct a solid stream of fluid perpendicular to airplanes surfaces.
(e)
Check that ice and/or snow is not forced into areas around flight controls during ice and snow removal.
(f)
Remove all ice or snow from the door and girt bar areas before closing any door.
(g)
Cargo doors should be opened only when necessary. Cargo containers should be cleared of ice or snow prior to loading. Apply deicing/anti-icing fluid on pressure relief doors, lower door sills and bottom edge of door prior to closing doors for flight.
(h)
Do not use hard or sharp tools to scrape or chip ice from airplane surface.
(i)
Both the right and left sides of the wing and the right and left sides of the horizontal stabilizer must receive the same and complete deicing/anti-icing treatment.
(j)
Any traces of deicing/anti-icing fluid on cockpit windows must be removed prior to departure, particular attention being paid to windows fitted with wipers. In addition any forward area from which fluid may flow back onto windshields during taxi and takeoff must be clean prior to departure.
(k)
After prolonged periods of deicing/anti-icing, it is advisable to check aerodynamic quiet areas and cavities like balance bays and wing and stabilizer rear spars for residue of deicing/anti-icing fluids.
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(13)
When slush is present on runways, inspect the aircraft when it arrives at the ramp for slush accumulation on the airplane or damage to airplane surfaces.
(a)
Check leading edges, flaps, flap wells, vertical stabilizer, rudder, underside and upper surface horizontal stabilizers and elevators for ice accumulation and skin panel damage. Deice as required.
(b)
Check landing gear wheel well areas for accumulation of ice, slush and snow. Deice as required.
(c)
Check skin panels aft of wheel wells for edge deformation.
(14)
Check deicing/anti-icing fluid concentration before application to airplane.
(15)
Use a boomtruck, a cherry-picker or deicing/anti-icing truck to do deicing/anti-icing.
WARNING: DO NOT WALK ON THE WINGS OR THE HORIZONTAL STABILIZER. ICE OR SNOW ON THESE SURFACES IS NOT SAFE. MAINTENANCE PERSONS CAN FALL WHICH MAY CAUSE PERSONAL INJURY OR AIRPLANE DAMAGE.
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