12-33-01
ALL ú ú 01 Page 308 ú Jan 20/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G97011
A
757
MAINTENANCE MANUAL
GUIDELINE SUMMARY FOR APPLICATION OF TYPE II/TYPE IV FLUID MIXTURES (MINIMUM CONCENTRATIONS) AS A FUNCTION OF OAT
CONCENTRATION (PERCENTAGE BY VOLUME)
ANTI-ICING FLUID/WATER
TEMPERATURE OUTSIDE AIR OAT ONE-STEP PROCEDURE 2 TWO-STEP PROCEDURE 2
DEICING/ANTI-ICING 1ST STEP: DEICING 2ND STEP: ANTI-ICING 1
AND ABOVE -3`C (27`F) 50/50 HEATED TYPE II/IV AND WATER. TYPE II OR TYPE IV FLUID (180`F) MINIMUM AT THE TANK OR A HEATED MIX OF TYPE I, WATER TREATED TO 82`C 50/50 TYPE II/IV
TO -14`C (7`F) BELOW -3`C (27`F) 75/25 HEATED TYPE II/IV TYPE I, TYPE II OR TYPE IV HEATED SUITABLE MIX OF 75/25 TYPE II/IV
TO -25`C (-13`F) -14`C (7`F) BELOW HEATED TYPE II/IV 100/0 WITH FP NOT MORE THAN 3`C (5`F) ABOVE ACTUAL OAT. TYPE II/IV 100/0
-25`C (-13`F) BELOW USE OF TYPE II/TYPE IV FLUID FOR ANTI-ICING BELOW -25`C (-13`F) SHALL MAINTAIN 7`C (13`F) BUFFER BETWEEN THE FP OF THE NEAT FLUID AND OAT, AND THE FLUID SHALL CONFORM TO THE LOWEST OPERATIONAL USE TEMPERATURE/AERODYNAMICS ACCEPTANCE LIMITATION. CONSIDER USE OF TYPE I FLUID WHEN TYPE II/TYPE IV FLUID CANNOT BE USED.
TYPE II AND TYPE IV FLUIDS
_______WING SKIN TEMPERATURES MAY DIFFER AND IN SOME CASES MAY BE LOWER THAN OAT.
CAUTION: A STRONGER MIX (MORE GLYCOL) CAN BE USED UNDER THE LATTER CONDITIONS.
____FOR HEATED FLUIDS, A FLUID TEMPERATURE NOT LESS THAN 82`C (180`F) AT THE TANK
NOTE: IS DESIRABLE. UPPER TEMPERATURE LIMIT SHALL NOT EXCEED FLUID AND AIRPLANE MANUFACTURER'S RECOMMENDATIONS.
TO BE APPLIED BEFORE FIRST STEP FLUID FREEZES, TYPICALLY WITHIN 3 MINUTES
REFER TO PARAGRAPH 1.C. FOR DEFINITIONS FOR ONE-STEP, TWO-STEP AND ANTI-ICING PROCEDURES.
Fluid Mixture Guidelines for Deicing
Figure 302 (Sheet 2)
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12-33-01
ALL ú
ú 01 Page 309
ú Jan 20/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G97033
A
757 MAINTENANCE MANUAL
2) The instructions of the fluid manufacturer
3) The air temperature
(h)
Make sure there is no ice, snow, or frost on the wing for the takeoff. To do this, the maintenance persons must carefully examine the airplane before the departure.
(i)
You must remove snow from a parked airplane regularly. This will make sure that a large quantity of snow will not collect and possibly freeze on the airplane surface.
CAUTION: CAREFULLY MOVE ROPES OR FABRIC HOSES ON THE WING OR
_______ FUSELAGE. EQUIPMENT THAT IS INSTALLED ON THE SURFACE OF THE WING OR FUSELAGE CAN BE DAMAGED BY THE MOVEMENT OF THE ROPES OR FABRIC HOSE.
(j)
Use brooms with long handles to remove the snow from the wings and horizontal stabilizers. This will make it easier. You can use ropes or a fabric fire hose to remove the snow from the fuselage. Move the rope or hose back and forth on the top of the fuselage as you move it aft.
(k)
Before you move an airplane out of a warm hangar during icing conditions, do the anti-icing procedure on the airplane. This will make it less possible that ice or snow will melt when it touches the warm airplane and freeze again.
(l)
If you remove ice with water that is not hot, you must do it in a warm hargar, if it is possible. Keep the airplane in the hangar until the surfaces are dry. It will be necessary to do a check fo those areas where the water can collect and freeze. If anti-icing fluid is applied, it is not as necessary for the airplane to dry.
(m)
General Precautions
WARNING:_______DEICING/ANTI-ICING FLUID IS DANGEROUS. DO NOT LET IT TOUCH THE SKIN OR EYES, AND USE CLOTHING THAT GIVES SUFFICIENT PROTECTION.
1) Do not point a spray of deicing/anti-icing fluid directly at or into the pitot inlets, TAT probes or static ports. 2) Do not point a spray of hot deicing fluid or hot water directly at cold windows. 3) Do not point a spray of deicing/anti-icing fluid directly into the engine, APU, scoops, vents, drains, etc.
4) Do not use more than 10 psi on an area of 25 square inches. Do not point a solid flow of fluid directly at the airplane surfaces.
5) Make sure that ice and/or snow is not pushed into the areas
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