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B.  In very cold weather, drain fuel tank sumps prior to refueling to remove water from fuel tanks if the airplane has been idle for more than 45 minutes prior to refueling. Drain fuel tank sumps again after refueling if the airplane has been idle for 2 hours or more after refueling, prior to departure.
11.  Toilets and Potable Water
A.  In an operating airplane, there is sufficient heat present to prevent water from freezing. When the airplane is shutdown and left in an unheated area, additional servicing will be required as follows if the cabin temperature is expected to fall below the freezing point.
(1)  
Potable Water The potable water system must be drained of all water (Ref. Chapter 38, Passenger Water Systems - Servicing).

(2)  
Toilets

(a)  
Antifreeze fluids may be added to the toilet flushing water to prevent freezing. Care must be exercised in the selection of materials used. Foaming may occur as a reaction between the antifreeze and the flushing deodorizer detergent. Antifoam agents may also deteriorate in the presence of the deodorizing detergent and allow foaming to occur. Check fluid manufacturers' recommendations for compatibility.

(b)  
The toilet flushing system may be completely drained to prevent freezing (Ref Chapter 12, Waste Water System - Servicing).

 

500 
May 01/00  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  12-50-0 Page 215 

500 
12-50-0 Page 216  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/90 

GUIDELINE SUMMARY FOR APPLICATION OF TYPE I FLUID MIXTURES (MINIMUM CONCENTRATIONS) AS A FUNCTION OF OAT 
OAT  1 STEP PROCEDURE  2 STEP PROCEDURE 
°C  °F  DEICING/ANTI-ICING  1ST STEP: DEICING  2ND STEP: ANTI-ICING* 
-3 AND ABOVE  +27 AND ABOVE  FP OF FLUID MIXTURE SHALL BE AT LEAST 10°C (18°F) BELOW OAT  WATER HEATED TO 80°C (180°F) AT THE TANK, OR A HEATED MIX OF FLUID AND WATER  FP OF FLUID MIXTURE SHALL BE AT LEAST 10°C (18°F) BELOW ACTUAL OAT 
BELOW -3  BELOW +27  FP OF HEATED FLUID MIXTURE SHALL BE NOT MORE THAT 3°C (5°F) ABOVE ACTUAL OAT 

°C °FOAT FP DEGREES CELSIUS DEGREES FAHRENHEIT OUTSIDE AIR TEMPERATURE FREEZING POINT  *TO BE APPLIED WITHIN 3 MINUTES 
TYPE I FLUIDS 

500  Fluid Mixture Guidelines for Deicing 
Feb 20/93  Figure 201 (Sheet 1)  12-50-0 
Page 217 
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GUIDELINE SUMMARY FOR APPLICATION OF TYPE II/TYPE IV FLUID MIXTURES (MINIMUM CONCENTRATIONS) AS A FUNCTION OF OAT 
MIXTURE SHOULD BE HEATED TO 80-90°C (176-194°F) 
OAT  CONCENTRATION (PERCENTAGE BY VOLUME) ANTI-ICING FLUID/WATER 
°C  °F  ONE STEP 1 PROCEDURE  TWO STEP 1 PROCEDURE 2  ANTI-ICING 
-3 -7 -14 -17 -25  +27 +19 +7 +1 -13  1ST STEP DEICING  2ND STEP ANTI-ICING* 
50/50 HEATED TYPE II/IV INCLUDES ANTI-ICING IN REGARD TO WEATHER CONDITIONS  WATER TREATED TO 80°C (180°F) MINIMUM AT THE TANK OR A HEATED MIX OF TYPE I, TYPE II, OR TYPE IV FLUID AND WATER  50/50 TYPE II/IV 
50/50 HEATED OR SUITABLE MIX OF TYPE I, TYPE II, OR TYPE IV FLUID WITH FP NOT MORE THAN 3°C (5°F) ABOVE ACTUAL OAT 
75/25 HEATED TYPE II/IV INCLUDES ANTI-ICING IN REGARD TO WEATHER CONDITIONS  75/25 TYPE II/IV 
100/0 TYPE II/IV 
75/25 HEATED OR SUITABLE MIX OF TYPE I, TYPE II, OR TYPE IV FLUID OR WITH FP NOT MORE THAN 3°C (5°F) ABOVE ACTUAL OAT 
BELOW  BELOW  USE OF TYPE II/TYPE IV FLUID FOR ANTI-ICING BELOW -25°C (-13°F) 
-25  -13  SHALL MAINTAIN 7°C (13°F) BUFFER BETWEEN THE FP OF THE HEATED FLUID AND OAT, AND THE FLUID SHALL CONFORM TO THE LOWEST OPERATIONAL USE TEMPERATURE/AERODYNAMICS ACCEPTANCE LIMITATION. CONSIDER USE OF TYPE I FLUID WHERE TYPE II/TYPE IV FLUID CANNOT BE USED. 

TYPE II AND IV FLUIDS

Refer to Paragraph 1.D. for definitions for one-step, two-step, and anti-icing procedures.

Freezing point of fluid mixture at the first step shall be not more than 3C above OAT.
* To be applied within 3 minutes.
Fluid Mixture Guidelines for Deicing  500 
12-50-0  Figure 201 (Sheet 2)  May 01/98 
　
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