ATA 38

Question 1

How many potable water tanks are installed on B777
a One
b Two
c Three

Question 2

Where can you check the water level remained in the tanks
a CSCP at door 1L
b CACP at door 2L
c CACP at door 4L

Question 3

Where can you fill the water tanks

a At aft potable water service panel

b At mid potable water service panel

c At forward potable water service panel

Question 4

Lavatory water heater is located
a Next to water tank
b Below sink
c Behind mirror

Question 5

Where can you find water isolation/drain valve handle
a Above door 1L
b Above door 2L
c Above door 4L

Question 6

Water tank quantity transmitters send signal
a Direct to water gage
b Direct to CSS panel
c To summary unit

Question 7

Where can you find the water quantity gage

a At aft potable water service panel

b At forward potable water service panel

c At cabin service system panel

Question 8

Water quantity transmitter is
a Capacitance type
b Resistance type
c Reluctance type

Question 9

Air compressor will operate to pressurize water tanks when

a Airplane on ground

b Airplane in the air

c Pneumatic pressure is not sufficent to pressurize water tanks

Question 10

The lavatory sink and galley drain water system is called
a Brown water drain system
b Gray water drain system
c Blue water drain system

Question 11

When vacuum blower is used to create vacuum for waste system
a At altitude below 31000ft
b At altitude below 28000ft
c At altitude below 16000ft

Question 12

Which 2 tanks are connected to one vacuum blower
a Tank 1 and 2
b Tank 2 and 3
c Tank 1 and 3

Question 13

Flush control module valve maintenance switch is used to operate the blower for
a 2 seconds
b 5 seconds
c 10 seconds

Question 14

Flush duty cycle is
a 10 seconds
b 15 seconds
c 20 seconds

Question 15

Which sensor is used to measure the waste level in waste tank
a Point level sensor
b Continuous level sensor
c Waste sensor

Question 16

What happen when both point level sensors shown tank is full

a Power is removed from all toilets that connected to that full tank

b Pop up screen is shown on CSCP/CACP

c Both are correct

Question 17

Where can you check which toilet is unserviceable if one tank is full
a Check at CSCP/CACP
b Check at MAT
c Check at PAT

Question 18

How many potable water tank are there on VNA B777? (A, B1, B2)
a. 3
b. 2
c. 1

Question 19

Where can you find potable water system isolation/drain valve in passenger cabin?
(A, B1, B2)

a. Above the ceiling aft of door 4 left

b. Above the ceiling fwd of door 4 left

c. Above the ceiling aft of door 2 left

Question 20

Where can you find water shutoff valve in the lavatory? (A, B1, B2)
a. Under the water sink
b. Behind the mirror
c. Behind the waste bin

Question 21

Which of the following statements is true (A, B1, B2)

a. The fill/overflow valve lets water flow overboard when tanks are full

b. The fill/overflow valve opens to turn on air compressor

c. The fill/overflow valve lets air flow into the tanks

Question 22

Where can you find potable water system drain valves? (A, B1, B2)

a. In the forward and aft drain panels

b. In the cargo compartments

c. In the forward most and aft most lavatory

Question 23

The potable water isolation valves isolate the overhead water distribution lines to (A, B1, B2)

a. Forward and mid lavatories and galleys

b. Forward lavatories and galleys

c. Mid lavatories and galleys

Question 24

After an overheat condition, water heater in lavatory will be (B1, B2)
a. Automatically reset
b. Manually reset
c. Changed

Question 25

What you need to do if you want to adjust water quantity transmitter? (B1, B2) a. Use the CACP b. Supply electrical power c. Fill the tanks to full then drain them

Question 26

Purpose of drain restrictor valves? (B1) a. To limit grey water flow out of the drain mast on the ground b. To restrict grey water flow from the drain mast c. To limit air flow from the drain mast to prevent noise

Question 27

What do you do to prevent cabin pressure go out through the vacuum system if the flush valve fails in open position (A, B1, B2) a. Push manual handle to close the valve b. Pull manual handle to close the valve c. Disconnect electric connector to flush control handle

Question 28

How do you keep the flush valve in open position for maintenance? (A, B1, B2) a. Remove power to the flush control module b. Push manual handle c. Push maintenance switch on the flush control module one time

Question 29

When do the vacuum blowers operate? (A, B1, B2) a. Below 16000ft b. Above 16000ft c. Any time flush switch is activated

Question 30

What component de-energizes the vacuum blowers above 16000 ft? (B1) a. Flush control module pressure switch b. ASCPC c. Barometric switch

Question 31

Which of the following sensors send signal to the LCM when the waste tanks is full (B1) a. Continuous level sensor b. Tank full sensor c. Point level sensor

Question 32

Data from continuous level sensor is used (B1, B2) a. To control when tanks are full b. For indication on CACP and CSCP c. To shutdown effected lavatories

Question 33

What component do you use to do zero adjustment for continuous level sensor? (B1) a. Logic control module (LCM) b. CACP or CSCP c. Flush control module

Question 34

What air is used to pressurize potable water tank? (A, B1, B2) a. Air from compressor only b. Air from pneumatic system or from compressor c. No air is required

Question 35

Where is the compressor interlock switch located? (B1) a. On the waste tank b. On the compressor c. Behind the right end wall of the bulk cargo compartment