F91453
Toilet Service Panels 502
38-32-0Page 8 Figure 4 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/66
10. Toilet Operation
A. As the flush handle is rotated, the timer allows 115-volt ac power to the toilet flush motor for 10 ±2 seconds. The flush motor operates the flush pump top pump approximately 2 gallons of liquid through the toilet in each cycle. At the end of the cycle the motor stops and the liquid drains into the waste tank.
B. The waste tank is drained by pulling the waste drain valve handle on the toilet service panel after attaching the ground service cart to the 4-inch drain outlet and removing the toilet drain plug. The tank is cleaned by attaching water under pressure to the ground flush connection (Fig. 5).
(a)
On toilet assemblies with fixed filter, the water enters the tank through the spray nozzles
(b)
On toilet assemblies with rotating filter, the water enters the tank through the cleansing ring.
565 Toilet System Schematic
Oct 20/84 Figure 5 38-32-0
Page 9
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TOILET SYSTEM - TROUBLE SHOOTING
1. General
A. These procedures apply to each toilet system. Trouble shooting of the toilet flushing system is outlined in the trouble shooting chart, par. 3. Procedures for correction of problems not directly related to the flushing system are described in par. 2.
CAUTION: WHEN TROUBLE SHOOTING THE TOILET FLUSHING SYSTEM, DO NOT OPERATE THE FLUSH PUMP WHEN THE TANK IS DRY.
2. Toilet System - Trouble Shooting
A. An unpleasant odor from the toilet unit indicates improper servicing of the toilet system. To correct, drain and flush the toilet system and ensure that recommended service procedure is being followed including use of proper chemical solution.
B. If liquids are present in the drain tube prior to opening the drain valve, a damaged or obstructed drain valve or valve seat is indicated. Remove waste tank cover and check the drain valve. If valve is obstructed, remove obstruction. If valve is damaged, replace valve. If valve seat is damaged, replace toilet tank.
NOTE: On airplanes with lavatory floor drains, the presence of liquids in the toilet drain tube does not necessarily mean that the drain valve or valve seat is defective. On these airplanes, check drain valve and valve seat only if it is apparent that the liquids came from the toilet tank.
539
Jan 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 38-32-0 Page 101
3. Toilet Flushing System Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Toilet flushes continuously Flushing starts and stops properly, but with insufficient fluid flow Toilet does not flush Defective timer Defective tubing Filter clogged Defective motor-filter-pump assembly Defective wiring Visually check flush tubing between flush motor and toilet bowl while toilet is operating. if leakage is observed in tubing or at connections, it is defective 1. Open separator and visually check slots or holes. If plugged with debris, filter is clogged 2. If servicing toilet tank does not clear filter debris, filter must be cleaned manually 3. If fluid flow is still insufficient If leakage was not observed in tubing and filter not clogged, the motor-pump-filter assembly is defective Check for power to timer and continuity of wiring between timer and flush motor. If power is not available or continuity is not present, the wiring is defective Replace timer Replace or repair defective tubing or connections Service toilet tank (Ref 12-17-0) and check flushing action again Open separator and use suitable rod or bent wire or long handled brush to remove debris from filter. Check flushing action again. Remove motor-pump-filter assembly. Clean filter using steam and/or bristle brush (Ref 38-32-21)Replace defective motor-pump-filter assembly (Ref 38-32-21) Replace or repair defective wiring
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