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Jun 30/01
38-31-00
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SD3-60 AIRCRAFT MAINTENANCE MANUAL
AMM38-31-00 1.0.0.0WASTE DISPOSAL - DESCRIPTION & OPERATION
1. Description
A Thetford Electra Magic water closet unit is fitted to the aircraft.
This is a self contained unit with an electric re-circulation pump and a solid-state flush cycle timer.
A dual filtration system is incorporated to prevent the re-circulation of solids.
A narrow vertical window on the front of the unit indicates the level of the tank contents. The
initial charge level is marked 'C' and the full level is marked 'F' to indicate when the unit should be
emptied.
A raised housing at the rear of the unit contains the electric motor and the flush cycle timer which
is activated by a PRESS-TO-FLUSH button on the housing.
An external servicing connection is located at Stn. 493, fuselage aft underside.
2. Operation
On Tail Distribution Panel 3D, circuit breaker No. 129 is to be closed before the toilet can be
operated. Operating the PRESS-TO-FLUSH button activates the flush cycle timer which switches
on the pump motor. The flushing duration is 7 seconds. The water closet unit must be emptied
when or before the fluid level reaches the full (F) mark on the indicator window.
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SD3-60 AIRCRAFT MAINTENANCE MANUAL
AMM38-31-01 2.0.0.0WATER CLOSET - MAINTENANCE PRACTICES
1. Removal/Installation
A. Remove a water closet.
(1) Drain and flush the water closet. Refer to 12-10-38, pb301.
(2) Isolate electrical supply to water closet by opening circuit breaker 129 on Tail Distribution
Panel 3D.
(3) Remove panel 265 DZ, between Stn. 475 and 508, right side.
(4) Disconnect the electrical connections at TB 124 terminals 1 & 2.
(5) Remove screws from base moulding of water closet and remove moulding.
(6) Remove four bolts from support angles of water closet.
(7) Lift water closet up to clear floor fitting.
B. Install a water closet.
NOTE: Operation (1) only applies if unit is that which has been removed. Operation (3) only
applies if unit is not that previously removed.
(1) Clean any residual sealant from around water closet outlet.
(2) Clean any residual sealant from around floor fitting.
(3) Remove screws from base moulding of water closet and remove moulding.
(4) Install water closet in position making sure that it seats into floor fittings.
(5) Install four bolts in water closet support angles and tighten.
(6) Apply sealant PR 1422-B locally, where required.
(7) Fit base moulding to water closet and tighten attachment screws.
(8) Identify and make electrical connections at TB 124 terminals 1 and 2.
(9) Replace panel 265 DZ between Stn. 475 and 508, right side.
(10) Energize electrical circuit by closing circuit breaker 129 on Tail Distribution Panel 3D.
(11) Ensure that drain valve handle at base of water closet is in the closed position and
locked.
(12) Replenish the water closet. Refer to 12-10-38, pb301.
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SD3-60 AIRCRAFT MAINTENANCE MANUAL
2. Adjustment/Test
A. Function check thermostat
(1) Isolate power supply to water closet by opening C/B No.129 on tail distribution panel 3D.
(2) Remove the cover, housing the electric motor and flush cycle timer, retaining two screws.
(3) Disconnect cables idented M and R from electric motor, end withdraw cover.
(4) Place protective covering locally on water closet around motor.
(5) Connect continuity tester across terminals idented L and R.
(6) Apply heat source having an output capability of 70°C maximum, to thermostat mounted
on top bearing of motor, checking that continuity is broken before 60°C.
(7) To reset, reduce thermostat temperature to below 5°C, using aerosol coolant, or careful
application of crushed or dry ice, checking that continuity is re-established.
(8) Remove continuity test apparatus and protective covering.
(9) Connect timer unit wiring idented M and R to respective terminals idented L and R.
(10) Replace cover with two attaching screws.
(11) Close C/B No.129 on tail distribution panel 3D.
(12) Check water closet flushes normally.
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