(b) Make sure the oil temperature is at least 86°F (30°C) before you increase the power above idle.
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747-400 MAINTENANCE MANUAL
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(21) Observe the flight crew and portable oxygen systems.
(a) It may be noted that the pressure in the flight crew and portable oxygen systems may indicate lower than normal at cold temperatures (AMM 12-15-08/301).
TASK 12-33-02-003-062
5. Interior Ice Removal (Fig. 301)
____________________
A. General
(1) After every 290 flight hours when you operate continuously in cold weather, you must do the Overall Ice Removal steps.
NOTE: Removal of the ice build-up will not impact the airplane's
____
center of gravity.
(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.
(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 203-063
(1) Get access to the upper deck overhead. Get access to the main deck overhead in the front, middle and aft stations.
(a) To get access on passenger airplanes, you must also remove some of the upper deck and main deck ceiling panels.
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(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 200).
S 203-065
(1)
Remove the floor panels over the aisles in the main deck at
approximately STA 1230.
S 203-066
(2)
Look for ice collection between the longitudinal floor beams over the wing box and wheel well.
S 203-067
(3)
Remove the sidewall liners in the aft lower cargo compartment. .
S 203-068
(4)
Look for ice collection in the bilge area.
(a) If you do find ice, you must do the Overall Airplane Ice Removal.
S 203-069
(5) Do the Overall Ice Removal after every 290 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 203-070
(1) Move the airplane to a hangar where the air temperature is above 32°F (0°C).
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