(b)
If engines/APU are operating, close cabin air conditioning pack valves and bleed valves to prevent fumes from entering cabin when applying deicing or anti-icing fluid in the area of the engines/APU inlets.
(c)
Do not spray deicing/anti-icing fluid directly into the engine or APU inlet ducts, exhausts, engine thrust reverser, engine inlet, strut mounted probes or engine bleed air ducts.
(d)
Remove ice from APU inlet door vortex generator while APU is not running.
(5)
Brakes
(a)
Brakes must be cool (hand may be held on housing) before applying deicing/anti-icing fluid to the wheel area.
(b)
When deicing or anti-icing the airplane, protect the wheels and brakes from fluid contamination with the methods below: 1) Do not direct a spray of deicing or anti-icing fluid at the wheels or brakes. 2) Use suitable covers on the wheels and brakes when operationally feasible.
CAUTION: CLEAR APU INLET AREA BEFORE STARTING APU. APU MAY BE DAMAGED BY ACCUMULATED ICE OR SNOW ENTERING INLET.
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CAUTION: MAKE SURE DEICING/ANTI-ICING FLUIDS DO NOT GET IN THE STEEL OR CARBON BRAKE HEAT SINKS. CONTAMINATION CAN CAUSE DAMAGE TO CARBON BRAKES AND REDUCE BRAKING PERFORMANCE FOR CARBON AND STEEL BRAKES.
3) Apply the parking brake to reduce incidental contamination of brake friction surfaces when operationally feasible.
NOTE: The brakes do not need to be reapplied if the wheels have not rotated since the last brake application.
(c) Manually remove snow or ice accumulation from the wheel, brake, or tire. A hot air blower may be used for this purpose.
(6) Landing Gear and Doors
(a)
Landing gear moving parts and position indicating switches may become coated with ice and/or snow which will prevent normal operation. Care must be exercised when applying deicing/anti-icing fluids not to dilute or remove lubricants. Unlubricated parts may seize or fail prematurely if not properly serviced.
(b)
Remove ice and snow from landing gear doors (inside and out), door latches, uplock mechanism, uplock hook, downlock mechanism, bungee springs, lock actuators and position indicating switches. Apply anti-icing fluid as a protection coating following deicing at operator option.
(c)
Check nose gear steering cables for ice accumulation and clear as necessary. Check landing gear alternate extension system control cables and mechanism and gear extension mechanism for ice formation in exposed and unheated areas;
(e)
Clear ground landing gear areas of ice and snow in order to minimize the possibility of tires freezing to the ground or of aircraft sliding due to wind or engine operation.
CAUTION: DO NOT ATTEMPT TO MOVE AIRPLANE IF TIRES ARE FROZEN TO GROUND AND ENSURE WHEELS ROTATE WHEN AIRPLANE IS MOVED.
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1) Use warm air, deicing fluid to free tires from the ground or to remove frozen deposits.
2) The use of salt is not recommended as it may be deposited on metal parts and result in corrosion.
(7) Wing fuel tanks
(a)
Frost may form under the wings in the fuel tank areas in temperatures above freezing. This is caused by atmospheric moisture condensing on the cold surfaces where fuel temperatures are below freezing. The frost will generally melt when warmer fuel is added. If the frost persists and is greater than 1/8 inch thick, it must be removed before takeoff.
(b)
Clear ice may form on the wing upper surface when temperatures of fuel in the tank is below freezing, the ambient temperature is above freezing, and rain, drizzle or fog is present. Carefully check the wing upper surface to determine if clear ice is present. Use suitable equipment to ensure adequate access to the wing upper surface for this check. In some cases, clear ice can only be detected by touch. Clear ice must be removed and the wing anti-iced, if appropriate, before takeoff.
CAUTION: IF YOU CAN DRAIN FUEL FROM DRAIN VALVE AFTER YOU APPLIED HOT AIR TO THE EXTERIOR FOR 3 TO 5 MINUTES, DO NOT THINK THAT ALL THE ICE IS MELTED. ICE ADJACENT TO THE DRAIN VALVE UNIT CAN MELT AND LET SOME WATER AND FUEL FLOW FROM THE DRAIN. BUT A PIECE OF ICE CAN STAY BEHIND. IF FUEL DOES NOT FLOW FROM THE DRAIN, CONTINUE TO APPLY HOT AIR FOR A SHORT TIME, AND FREQUENTLY DO A CHECK OF FLOW FROM THE DRAIN. CATCH FUEL IN A CONTAINER AND MAKE SURE ALL WATER IS REMOVED.
HEAT APPLIED TO THE SUMP DRAIN VALVES FOR OUTBOARD MAIN AND RESERVE TANKS WILL NOT REMOVE ICE WHICH HAS COLLECTED IN THE TANK SUMP OR IN DRAIN LINE BETWEEN TANK SUMP AND VALVE. TO REMOVE THIS ICE, YOU MUST PUT THE AIRPLANE IN A WARM HANGAR FOR SUFFICIENT TIME TO MELT ICE. THEN DRAIN SUMPS UNTIL THE WATER IS REMOVED.
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