A different potable-water tank standpipe is installed to change usable tank capacity, but the existing water-quantity transmitter adapter cable is left installed. What is the expected consequence?, The water quantity indication will be inaccurate because the adapter cable must match the installed tank/standpipe configuration., The potable-water tank will overfill because the standpipe position is electrically controlled by the adapter cable., The water quantity transmitter will automatically recalibrate itself after the next complete fill cycle., During potable-water servicing, the fill/overflow valve is selected OPEN. Which combination of flow paths is established by the four-port valve?, The potable-water fill line connects directly to the tank overflow line, while the tank fill line connects to the potable-water drain line., The water-tank fill and overflow lines are isolated so tank pressure can force water into the supply lines., The potable-water fill line connects to the water-tank fill line, while the tank overflow line connects to the potable-water drain line., The potable-water tank has been drained through the water service panel, but residual water remains in the forward lavatory and forward galley supply lines. What additional configuration is required to fully drain the system?, Open the forward lavatory drain valve and place each lavatory water-supply shutoff valve in SUPPLY ON., Place all lavatory water-supply shutoff valves in OFF and open only the fill/overflow valve., Open the water-heater pressure-relief devices and place the lavatory shutoff valves in FAUCET ONLY., A water-quantity transmitter outputs minus 10 volts direct current. What should both the service-panel quantity gauge and the aft-attendant-panel indication interpret this as?, An empty potable-water tank., A full potable-water tank., A transmitter fault because negative voltage is outside the normal operating range., The pneumatic manifold can no longer provide sufficient pressure to the potable-water tank. Tank pressure decreases below 30 pounds per square inch gauge, the water-service-panel door is closed, and transfer bus 1 is powered. What should occur?, The air compressor starts and continues operating until tank pressure reaches approximately 40 pounds per square inch gauge., The pressure regulator opens fully and allows unrestricted pneumatic manifold pressure into the tank., The air compressor remains inhibited until tank pressure falls below 20 pounds per square inch gauge., The pneumatic supply pressure to the water-tank pressurization system rises abnormally despite normal regulator operation. Which protection operates first at the common pressure-supply line?, The water-tank pressure-limit switch opens at approximately 35 pounds per square inch gauge and vents the pressure overboard., The air-compressor internal relief valve opens at approximately 40 pounds per square inch gauge., The pressure-relief valve opens at approximately 60 pounds per square inch gauge and resets at approximately 55 pounds per square inch gauge., In flight, water accumulates in a door-sill drain line. Why can this water remain trapped until after landing?, The drain fitting contains a check valve that remains closed whenever airspeed is above 60 knots., The drain valve closes when aircraft differential pressure reaches approximately 1 pound per square inch differential and reopens after depressurization., The drain mast heater closes a thermostatic valve during flight to prevent cold-air entry., A lavatory flush switch is pressed while the waste system is enabled. What sequence most accurately describes the timing controlled by the Integrated System Controller?, The rinse valve opens immediately for four seconds, followed by the flush valve for 0.8 seconds, and the vacuum blower starts only after both valves close., The vacuum blower is commanded for 15 seconds, the rinse valve opens 1.8 seconds after initiation for 0.8 seconds, and the flush valve opens at 2 seconds for four seconds., The flush valve opens immediately and remains open for 15 seconds while the rinse valve cycles repeatedly., The aircraft is below 16,000 feet and a lavatory flush is commanded, but the waste drain ball valve is open for servicing. Why does the vacuum blower not operate?, The vacuum check valve mechanically prevents the blower motor from rotating whenever the drain ball valve is open., The waste drain ball valve proximity switch opens the blower command circuit when the drain ball valve is open., The Logic Control Module interprets the open drain valve as a full-tank condition and removes all electrical power from the waste system., The continuous waste-level sensor indicates a full tank, but both point level sensors indicate not full and are healthy. What effect should this have on toilet operation?, The system disables only the aft lavatory until one point level sensor also indicates full., The Logic Control Module immediately disables all toilets because any full indication has priority., Toilet operation continues because the continuous level sensor alone does not command toilet shutdown.

ATA 38

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