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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 TASK 12-33-02-003-127
 5. Interior Ice Removal (Fig. 301)
____________________
 A. General
 (1)  
After every 50 flight hours of continuous airplane operation in cold weather, do the Overall Ice Removal steps.

 (2)  
Removal of the ice build-up will not impact the airplane's center of gravity.

 (3)  
This task is for interior ice removal in airplanes that have continuous operation in cold weather.

 (4)  
In the usual operation of the airplane, air goes 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 213-155
 (1)  Inspect the upper lobe for ice:
 (a)  
Get access to the main deck overhead above WL 300 in the front, middle and aft stations. 1) To get access on passenger airplanes, remove some of the

 main deck ceiling panels.

 (b)  
Remove or lift the insulation blankets to check the airplane skin, stringers, and frames for ice.

 (c)  
If ice is not found, do the Lower Lobe Ice Inspection.

 (d)  
If ice is found, 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 208).

 S 213-156
 (1)  Inspect the lower lobe for ice:
 (a)  Remove the floor panels over the aisles in the main deck at approximately STA 925.
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757
MAINTENANCE MANUAL

 (b)  
Look for ice between the longitudinal floor beams over the wing box and wheel well.

 (c)  
Remove the sidewall liners in the aft lower cargo compartment at approximately STA 1400.

 (d)  
Look for ice in the bilge area.

 (e)  
If ice is found, do the Overall Airplane Ice Removal.

 E. Overall Airplane Ice Removal
 NOTE: Do this procedure to remove ice from the interior airplane
____
 structure.

 S 663-157
 (1)  Remove ice from the interior of the airplane:
 (a)  
Move the airplane to a hangar where the air temperature is above 32°F (0°C).

 (b)  
Open all the doors on the main deck to let the air flow freely.

 (c)  
Remove all the main deck seats and floor panels to get access to the ice.

 (d)  
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.
 (e)  Remove the insulation blankets in the nose wheel well area (forward of the EE bay).
 WARNING: DO NOT PUT HOT AIR DIRECTLY ON HALON OR OXYGEN BOTTLES.
_______ IF YOU PUT HOT AIR ON THE HALON OR OXYGEN BOTTLES, THE BOTTLES CAN EXPLODE.
 CAUTION: THE TEMPERATURE OF THE HOT AIR MUST NOT BE ABOVE 150°F
_______ (70°C). HOT AIR CAN CAUSE DAMAGE TO AIRPLANE SYSTEMS.
 (f)  Use a conditioned ground cart to blow hot air on the open airplane structure in the lower lobes and main deck (if it is applicable) to melt the ice that has collected.
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