CAUTION: REMOVE THE DRAIN MAST PLUGS BEFORE YOU REMOVE THE SILL
_______ DRAIN PLUGS. DRAIN CLEANER SOLUTION WILL ENTER THE CABIN AREA IF YOU REMOVE THE SILL DRAIN PLUGS BEFORE YOU REMOVE THE DRAIN MAST PLUGS.
(m) Remove the sill drain plugs.
NOTE: More drain cleaner solution will come out of the
____
drain mast.
(n)
Drain the system fully.
(o)
Flush the system with clean water.
S 602-027
(6) Procedure 4
(a)
Remove the drain line sections which contain the blockage. 1) The usual problem areas are
-
the elbow fittings,
-
the drain mast lines
-
the "Y" sections where the lateral and longitudinal drain lines align.
(b)
On a blocked section which has the ribbon heater installed, do these steps: 1) Open the applicable circuit breaker for the waste line
heater. 2) Disconnect or remove the heater if it is necessary (AMM 30-71-11/401).
(c)
Remove the drain line fasteners, the clamps and the drain line section.
(d)
Do the steps that follow to remove the blockage: 1) Force pressurized air through the drain line. 2) Flush the drain line with the alkaline detergent.
F. Put the Airplane Back to Its Usual Condition
S 432-028
(1) Install the applicable parts that follow:
(a)
The drain line section.
(b)
The drain line heater (AMM 30-71-11/401).
(c)
The drain line strainer.
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A
737-300/400/500MAINTENANCE MANUAL
(d) The floor mat retainers.
S 412-029
(2) Close the applicable access doors and the circuit breaker.
G. Procedure 5 (Floor Drain System)
S 112-033
(1)
Use a suitable cleaner, Altrex B solution or Acetic Acid to remove blockage from the drain line.
S 112-034
(2)
If you use the Altrex B solution, mix 8 ounces of the Altrex B for each gallon of hot water.
S 112-035
(3)
If you use acetic acid, make sure you heat the solution to 160 degrees F (71 degrees C).
S 482-036
(4)
Put a suitable plug in the floor drain outlet at the skin of the airplane.
S 112-037
CAUTION:_______DO NOT GET THE DRAIN CLEANER SOLUTION ON THE AIRPLANE. THE DRAIN CLEANER SOLUTION ON THE SURFACES AROUND THE DRAINS CAN CAUSE CORROSION.
(5)
Put a sufficient quantity of the drain cleaner solution in the floor drains.
S 112-038
(6)
Make sure there are no leaks.
S 112-039
(7)
Stop for 1 hour to permit the drain cleaner solution to remove blockage from the drain line.
S 082-040
WARNING:_______MAKE SURE YOU WEAR A FACE SHIELD, GLOVES AND AN APRON. DRAIN FLUID IS TOXIC. IF IT TOUCHES YOUR SKIN IT CAN CAUSE INJURY.
(8)
Remove the plug.
S 682-041
(9)
Use a suitable blunt object to release the drain valve in the skin port.
(10)
Make sure the floor drain system is fully drained.
S 112-042
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