(2) This task is for interior ice removal in airplanes that have continuous operation in cold weather.
NOTE: This procedure will remove the ice build-up on the inside of
____
the airplane structure.
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(3) In the usual operation of the airplane, air comes through the airplane structure. During flight, the water vapor in the air can condense and freeze in the airplane. When you continuously operate the airplane in cold weather, ground temperatures below the freezing point will not let the ice melt. You must do the applicable tasks to find and remove the ice. Too much ice will lower the performance of the airplane below the permitted values.
B. Access
(1) Location Zones
100 Lower Half of Fuselage
200 Upper Half of Fuselage
C. Upper Lobe Ice Inspection
S 203-062
(1) Get access to the main deck overhead above WL 270 in the front, middle and aft stations.
(a) To get access on passenger airplanes, you must also remove some of the main deck ceiling panels.
S 583-063
(2) Remove or lift the insulation blankets to do a check of the airplane skin, stringers, and frames.
(a) Make sure no ice has collected on the airplane skin, stringers or frames. 1) If you do not find ice, you must do the Lower Lobe Ice
Inspection. 2) If you do find ice, you must do the Overall Airplane Ice Removal.
D. Lower Lobe Ice Inspection
NOTE: Do this procedure to find if ice has collected in the lower lobes
____
(below WL 210).
S 203-064
(1) Remove the floor panels over the aisles in the main deck at
approximately STA 660.
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S 203-065
(2)
Look for ice collection between the longitudinal floor beams over the wing box and wheel well.
S 203-066
(3)
Remove the sidewall liners in the aft lower cargo compartment at approximately STA 747.
S 203-067
(4)
Look for ice collection in the bilge area.
(a) If you do find ice, you must do the Overall Airplane Ice Removal.
S 203-068
(5) Do the Overall Ice Removal after every 50 flight hours when you operate continuously in cold weather.
E. Overall Airplane Ice Removal
NOTE: Do this procedure to remove all ice that has collected throughout
____
the airplane structure.
S 203-069
(1)
Move the airplane to a hangar where the air temperature is above 32°F (0°C).
S 203-070
(2)
Open the doors on the main deck to let the air flow freely.
S 203-071
(3)
Remove all the main deck seats and floor panels to get access to the ice.
S 203-072
(4)
Remove the insulation blankets from the sidewall and below the floor in the forward and aft lower lobe cargo compartment where it is possible.
NOTE: This will let the water flow freely to the structural drains
____ and will make sure the blankets do not get wet.
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S 203-073
(5) Remove the insulation blankets in the nose wheel well area (forward of the EE bay).
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