Monogram Systems
COMPONENT MAINTENANCE MANUAL
BASIC PN 15900
38-31-09
Page 3
May 17/02
3. Operation
A. The operation of the toilet begins with the initiation of the flush cycle. The electric
motor of the motor-pump-filter unit assembly is energized for approximately 10
seconds. Throughout the flush cycle, flushing fluid is drawn through the filter by the
pump and discharged into the toilet bowl in a swirling action to wash waste into the
tank assembly.
B. Toilet Assemblies must be serviced after each scheduled flight by emptying, flushing,
and recharging the tanks with fluid containing a dye-deodorant-disinfectant-chemical-
water solution. Draining, cleaning and filling of the toilet assemblies is controlled
from the aircraft toilet ground servicing panel. During toilet tank draining and
cleaning, the tank drain valve is opened. The drain valve is a plunger type valve that
is spring loaded to the closed position. A pull force of approximately 35 pounds
(15,91 Kg) is required to open the valve. During tank cleaning and filling, fresh
water is pumped into the toilet tank from an aircraft lavatory servicing vehicle. The
water enters the toilet tank through an inlet fitting of the solenoid valve assembly,
before going into the rotating spray nozzle via hose connection to the pump inlet.
The rotating spray nozzle is part of the motor-pump-filter assembly. The pressurized
fluid is jettisoned through spray nozzle openings and cleanses the inside of the filter
basket and tank side walls at same time precharge fluid is added. After the cleaning
operation the Liquid Level Transmitter will indicate when the fluid reaches the proper
pre-charge level.
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