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 **ON A/C ALL

 3. Description
___________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 002)

R **ON A/C 151-199, 301-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C ALL
 A. Water Quantity Transmitter 3MA The water quantity transmitter 3MA is installed in the water tank and monitors the volume of water remaining in the tank.
 B. Service Door 171AL The service door 171AL operates the micro switch 5MA. The micro switch controls the power supply to the quantity indicating system.
 C. Light Emitting Diode (LED) The Light Emitting Diode (LED) indicator on the forward attendant panel shows the water tank contents in percentage of volume.
 D. Circuit Breaker 1MA The circuit breaker 1MA gives electrical protection to the quantity indicating system circuit.
 E. Indicator Light 10MA The indicator light 10MA on the potable water service panel will come on when the water tank is full and the fill/drain valve is closed.
 4. System Operation
________________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 003)

 Water Content Transmitter 3MA
 Figure 002

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 Water Content Transmitter 3MA
 Figure 002A

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 Quantity Indicating System - Electrical Schematic
 Figure 003

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 (Ref. Fig. 003A)
 **ON A/C ALL
 The quantity transmitter 3MA, operates as a variable capacitor and uses the water in the tank as the variable component. Any increase of water in the tank increases the output signal, any decrease in water decreases the output signal. Two quantity indicators are supplied with transmitter output signal. The signal to the service panel indicator 6MA moves a pointer over a scale calibrated in increments of volume. The signal to the Forward Attendant Panel (FAP) LED indicator shows the percentage of volume if the panel pushswitch is pressed, (or the potable water service panel is open). The FULL indication light on the service panel will come on when the tank is full. The transmitter also has a low-level switch which opens when the water tank contents drop to a set level. When the low-level switch opens it disconnects the electrical supply to the water heaters in the lavatories.
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 The transmitter also has a high-level switch, which controls the operation of a relay to close the fill/drain valve 16MA. The high level switch will de-energize the relay to stop the filling procedure when the tank is full.

R **ON A/C 151-199, 301-399, 401-499,
 The transmitter also has a high-level switch, which controls the operation of a relay to close the fill/overflow drain valve 8MA. The high level switch will de-energize the relay to stop the filling procedure when the tank is full.
 **ON A/C ALL
 The micro switch 5MA closes to energize the indicating system when the service door 171AL is opened for ground servicing. The micro switch 5MA isolates the indicating system when the service door 171AL is closed again. A membrane switch, identified by 'IND ON', is installed on the forward attendant panel. The membrane switch overrides the micro switch 5MA, if you push it in.

 Quantity Indicating System - Electrical Schematic
 Figure 003A

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___________________________________________
 TASK 38-13-00-960-001
 Indication Lamps Replacement
 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific  1 ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
 No specific 1 WARNING NOTICE R No specific Torque Wrench : range 0.00 to 1.20 m.daN R (0.00 to 9.00 lbf.ft)
 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
　
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