(b) Use a surface contact thermometer to measure the temperature of the bottom skin of the tank to be drained.
R R R R NOTE : To do the procedure the temperature near to the drain____ valves should be 1 deg.C (33.80 deg.F) or more. It is possible that not all of the ice will be melted, thus the drain procedure will not be fully successful.
R R (c) Use an approved hot air blower to warm the bottom skin of the tank to be drained. Make sure the temperature of the bottom skin does not increase to more than 50 deg.C (122.00 deg.F).
R R R NOTE : The temperature of the bottom skin near to the drain valve____ should be 1 deg.C (33.80 deg.F) or more measured one minute after the removal of the hot air blower.
R R (d) Drain the accumulated water (Ref. TASK 12-32-28-281-001) 30 minutes after the aircraft has been refuelled (and before the bottom skin temperature near to the drain valves decreases below 0 deg.C (32.00 deg.F)).
NOTE : When you do the water drain procedure, it can be necessary____ to drain large quantities of fuel to get a satisfactory HYDROKIT test result (Ref. TASK 12-32-28-281-001).
Subtask 12-31-28-660-051
R B. Anti-Icing Additives
R R R (1) If you think that fuel temperatures will be less than 0 deg.C (32.00 deg.F) (and if it is not possible to warm the aircraft in a hangar) it is necessary to put anti-icing additives in the fuel. This makes sure that the water in the fuel does not freeze. When you add anti-icing additives to the fuel, the concentration must not be more than 0.15 % by volume. You must also make sure that the additive is fully mixed with the fuel.
R R NOTE : Refer to the engine manufacturer data for approved fuel____ additives.
R
5. Close-up
________ Subtask 12-31-28-942-050
A. Removal of Equipment
(1)
Remove the safety barriers
(2)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
COLD WEATHER MAINTENANCE - INDICATING/RECORDING SYSTEMS AND NAVIGATION
______________________________________________________________________ MAINTENANCE PRACTICES
_____________________ TASK 12-31-31-660-001 Cold Weather Maintenance - Indicating/Recording systems and Navigation
1. Reason for the Job
__________________
This procedure gives the cold weather maintenance practices for the
indicating/recording and navigation systems.
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-31-21-660-001 Cold Weather Maintenance - Air Conditioning
3. Job Set-up
__________ Subtask 12-31-31-941-050
A. Not Applicable
4. Procedure
_________ Subtask 12-31-31-660-050
A. General.
(1) When the Outside Air Temperature (OAT) is very low, cold (temperature lower than -15 deg.C (+5.00 deg.F)) in the avionics compartment can cause incorrect operation of the computers.
NOTE : This is only due to the cold weather conditions and not to a
____
technical malfunction.
Subtask 12-31-31-660-051
B. Recommendations.
(1) Make sure that the computers are at a temperature equal to or higher than -15 deg.C (+5.00 deg.F) for correct operation.
NOTE : If you energize the computers at very low temperatures the
____ following can occur. If the temperature is :
-equal to or lower than -40 deg.C (-40.00 deg.F), you can cause permanent damage to the computers.
-between -40 deg.C (-40.00 deg.F) and -15 deg.C (+5.00 deg.F), the computers can operate but normal operation can stop momentarily.
-equal to or higher than -15 deg.C (+5.00 deg.F), the computers operate normally.
(a)
Preconditioning It is recommended to use the pre-conditioning procedure to increase the temperature in the avionics compartment (Ref. TASK 12-31-21-660-001).
(b)
Energization of the computers If the temperature is higher than -40 deg.C (-40.00 deg.F), you can energize the computers to increase the temperature to -15 deg.C (+5.00 deg.F). The time necessary to increase the temperature will change with the OAT, the humidity and the time since the avionics compartment ventilation stopped.
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