Water & Waste Flashcards
What is the capacity of water system?
2 x 15 gal tanks
What switches control power for
water & waste system?
CABIN MASTERS and GALLEY /
CABIN PWR switches in TSC
Name the four (4) places where water
system is controlled.
Touch screens in galley and vestibule,
external service panel, and tank enclosure
How many toilets are on the aircraft?
Two
What’s the capacity of waste tank?
Approximate 12 gallon usable
How is water system pressurized?
Air compressors and / or bleed air
How many drains are there and where
are they located?
There are two drains on bottom of aircraft:
drain mast located in back and penetration
port located forward. Water drains out the
back in flight due to nose attitude and
differential pressure, and drains out the
front on ground due to nose attitude.
What are the two requirements for
water system operation?
Select GALLEY / CABIN PWR to ON
and select water system to ON at galley
touch screen
What happens when water system is
selected to ON with cabin temperature
below 34°F?
System heaters are selected ON and water
system operation is delayed for
approximately 20 minutes
What’s the difference between a line
drain and system purge?
Line drain allows all water in supply lines,
lavatory water heaters and galley water
heater to drain from aircraft; system purge
removes all water from supply lines and
water tanks
How much time is required to purge
the water tanks?
Approximately 5 minutes per tank
If you initiate a line drain or system
purge in flight, when is the procedure
completed?
After landing since forward supply/drain
valves open with weight-on-wheels
What check is performed to isolate a
leaking faucet, water heater, valve, or
line downstream of tank valves?
Leak
What’s the normal fill time for each
water tank?
Approximately 5 minutes per tank
What generates the vacuum for toilet
flush?
Cabin differential pressure or vacuum
generator; vacuum generator is required
for differential pressure < 6 psid (i.e.,
below approximately 16,000 ft).
