Water & Waste

Question 1

447. What is the capacity of water system?

Answer 1

2 x 20 gal tanks

Question 2

448. What switches control power for water & waste system?

Answer 2

CABIN MASTERS and GALLEY / CABIN PWR switches in TSC.

Question 3

449. Name the four (4) places where water system is controlled.

Answer 3

Touch screens in galley and vestibule, external service panel, and tank enclosure.

Question 4

451. What’s the capacity of waste tank?

Answer 4

Approximate 12 gallon usable.

Question 5

452. How is water system pressurized?

Answer 5

Air compressors and / or bleed air.

Question 6

453. How many drains are there and where are they located?

Answer 6

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.

Question 7

454. What are the two requirements for water system operation?

Answer 7

Select GALLEY / CABIN PWR to ON and select water system to ON at galley touch screen.

Question 8

455. What happens when water system is selected to ON with cabin temperature below 34°F?

Answer 8

System heaters are selected ON and water system operation is delayed for approximately 20 minutes.

Question 9

456. What’s the difference between a line drain and system purge?

Answer 9

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.

Question 10

457. How much time is required to purge the water tanks?

Answer 10

Approximately 7 minutes per tank.

Question 11

458. If you initiate a line drain or system purge in flight, when is the procedure completed?

Answer 11

After landing since forward supply/drain valves open with weight-on-wheels.

Question 12

459. What check is performed to isolate a leaking faucet, water heater, valve, or line downstream of tank valves?

Answer 12

Leak

Question 13

460. What’s the normal fill time for each water tank?

Answer 13

Approximately 7 minutes per tank.

Question 14

461. What generates the vacuum for toilet flush?

Answer 14

Cabin differential pressure or vacuum generator; vacuum generator is required for differential pressure < 6 psid (i.e., below approximately 16,000 ft).

Question 15

462. Can you flush the toilet on ground without AC power?

Answer 15

No

Question 16

No

Answer 16

Use manual flush handle to open flush valve.