Ice/Rain

Question 1

How are ice detector probes powered

Answer 1

115 v AC

Question 2

Describe bleed supply for airframe ice protection

Answer 2

2.2 air is used to cool 2.7 bleed air
Once cooled the bleed air goes to a controller and regulated to 18 PSI
at low engine power settings, 3.0 bleed air serves as the pneumatic source for de-ice boot operation

Question 3

How is 3.0 system cooled

Answer 3

by the high stage precooler if valve commanded by sensor, then by deicing precooler, both by 2.2

Question 4

What is a DDV

Answer 4

duel distributer valves, 6 ddvs inflate and deflate the six deicing boot sets

Question 5

What does the Timer Management Unit (TMU) do?

Answer 5

Manages automatic boot inflation sequence, manages DDV and check valve heaters when airframe mode select set to off, slow or fast. TMU failure indicated by DEICE TIMER caution light

Question 6

What happens when DDVs are not inflated

Answer 6

boots are held flush to leading edges by suction

Question 7

Describe the SLOW and FAST selections on the airframe

Answer 7

Automatic Slow - 3 min cycle
36 secs of inflation
144 secs of dwell
Automatic Fast - 1 min cycle
36 secs of inflation
24 secs of dwell

Question 8

How does the DDV heat work?

Answer 8

Airframe OFF, SLOW or FAST
DDV heat activates below +5C
Aiframe manual
DDV heat on continuously

Question 9

When will you get a deice press light?

Answer 9

Boot system pressure on either side is less than 15 psi (2 low pressure sensors),
DDV commands pressure to inflate boot but pressure is not sensed,
DDV commands to release pressure for boot deflation but pressure is sensed

Question 10

What else is deice pressure used for?

Answer 10

regulated deice pressure for forward pax and aft cargo door seal inflation

operate ejector for pressurization system aft safety valve

Question 11

How much of the blade is heated?

Answer 11

about 70%, powered by AC

Question 12

When do you turn the prop heat on

Answer 12

TAT air temp at or below 5C and Np greater than 400, weight off wheels

Question 13

What do the timer monitor control units do

Answer 13

monitors prop speed, monitors TAT (5C), monitors system for faults, controls timing and distribution of heat

Question 14

What does turning the prop selector to ON or TEST do to the ED

Answer 14

changes the temperature gauge to change on the ED (0-65)

Question 15

When will you get the prop deice light?

Answer 15

illuminates if TMCU detects limits unsafe for continued operation

Question 16

What is the STBY Pitot tube used for

Answer 16

IESI and CPCU

Question 17

Engine intake adapter heaters work when?

Answer 17

engine running (oil press)
heater thermostat closed (-15C)
engine intake bypass doors open
115 AC
flying spare

Question 18

when will you get eng adpt heat light

Answer 18

Indicates both the primary and secondary heating elements in the respective engine adapter heater have failed

Question 19

What is the windshield heat powered by?

Answer 19

115 v AC

Question 20

What does the alternate pilot wiper system provide

Answer 20

provides back up for pilot side