1) Inspect each static port and if necessary use naphtha or equivalent, and a clean dry rag to remove all tape residue, dirt and other contaminants around the static port.
(b)
Surge tank and fuel tank vents
(c)
APU exhaust duct outlet port
(d)
APU oil cooling air exhaust port
(e)
Overboard exhaust valve port
(f)
Ram air inlet and outlet doors
(g)
Outflow valves
S 843-041
(4) Remove the STATIC PORTS COVERED tag from the left control wheel in the flight deck.
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12-25-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
COLD WEATHER MAINTENANCE - SERVICING
____________________________________
1. General_______
A. Airplane operation in cold weather conditions can cause special problems. These problems occur because of the effects of the ice, snow, slush, frost, and low temperatures. Maintenance persons must know the effects of cold weather to keep the costs and time to a minimum.
B. This procedure has the data for protection against ice, snow, slush and frost from the airplane. The procedure gives data for the prevention of subsequent ice, snow, slush and frost. It also includes other related data for the operation of the airplane in cold weather. The operator must find and use the correct procedures for the weather conditions that occur.
C. The person that does the work must make sure the procedures for operation of equipment during ice, snow and/or frost conditions are satisfactory for the conditions of operation. Use the data that follow to make sure the procedures are satisfactory:
(1)
The cold weather conditions that occurred before.
(2)
The equipment or materials that are available.
(3)
The weather conditions at the airport where you will operate.
D. In cold weather it is necessary to drain the fuel tank sumps prior to refueling to remove water from the fuel tanks if the airplane has been idle for more than 45 minutes prior to refueling. Drain the fuel tank sumps again after refueling if the airplane has been idle for 2 hours or more after refueling, prior to departure (AMM 12-11-03/301). In cold weather water can freeze and, and not let the drain valves open.
E. Definitions
(1)
Deicing is a procedure to remove the frost, ice or snow from the airplane. Hot water or a hot mixture of water and deicing/anti-icing fluid is applied to do this.
(2)
Anti-icing is a procedure to make sure that ice, snow and/or frost does not collect and become attached to the airplane surfaces. Anti-icing fluid or a mixture of anti-icing fluid and water is applied to the airplane to do this.
(3)
One step ice removal/anti-icing applies a hot deicing/anti-icing fluid or mixture of fluid and water. Use the conditions that follow to make a decision on how hot to make the fluid or the fluid and water mixture:
(a)
The ambient temperature.
(b)
The weather conditions.
(4)
Two-step ice removal/anti-icing has the steps that follow:
(a)
Apply hot water or a hot mixture of deicing/anti-icing fluid and water to remove the ice.
(b)
Immediately follow with a spray of a deicing/anti-icing fluid or a mixture of deicing/anti-icing fluid and water for anti-icing. This step must be done less than 3 minutes after you started the first step. If it is necessary, do the procedure area by area.
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