ICE AND RAIN PROTECTION

Question 1

How are the nacelle air intakes de-iced?

Answer 1

Bleed air de-ice boots

Question 2

What indications are there that airframe de-icing is operating?

Answer 2

Lights on the ice protection panel and visually see the boots inflate

Question 3

Is de-icing pressure used for anything else? What pressure is air admitted to the de-ice system?

Answer 3

Door seal, rudder shut off valve, rear outflow valve motive flow. 18PSI

Question 4

What does illumination of the DE-ICE PRESS caution light tell you?

Answer 4

Less than 5.5 PSI in the system sensed at the door seal

Question 5

If a de-icing duct ruptures, what can you do to maintain ice protection?

Answer 5

Boot air ISO switch and then use manual operation on the remaining boots.

Question 6

How long is a complete FAST cycle? SLOW cycle?

Answer 6

36 seconds for the fast, 6 seconds per boot and 24 second dwell.
210 seconds for the slow, 6 seconds per boot and 204 second dwell.

Question 7

Deicer boot inflation time during Airframe AUTO operation is?

Answer 7

6 seconds X 6

Question 8

What is the difference between timers 1 and 2 in the propeller de-icing system?

Answer 8

timer one is used normally, timer 2 used if 1 fails

Question 9

How do you know the propeller de-icing system is working?

Answer 9

The lights illuminate.
Above 10 - 10 seconds on 60 off
Above 10 - 20 seconds on 60 off

Question 10

Can prop de-icing work on the ground?

Answer 10

Prop de-icing is inhibited by the PSEU however can be tested by using the test switch, >900RPM

Question 11

What does illumination of the PITOT HEAT 1 or 2 caution lights indicate?

Answer 11

Failed or switched off

Question 12

What are the power sources for stall warning transducer heat? What switch controls the heating power for the stall warning transducer?

Answer 12

28VDC on the ground and 115VAC airborne, stall warn switch turns it on

Question 13

When are the engine intake flange heaters activated?

Answer 13

When the bypass door is open and temperature below 15deg.

Question 14

Is elevator horn heat available on the ground? What powers the elevator horn heaters?

Answer 14

PSEU inhibits it on the ground and above 15deg, 115VAC

Question 15

Is there any warning of elevator horn heater failure?

Answer 15

L/R elev horn heat caution and master caution.

Question 16

Which cockpit windows are heated and how?

Answer 16

The front two via w/shield heat switch. Captain side window via plt window heat. single phase 115VAC.

Question 17

Why is there a WARM UP selection?

Answer 17

to avoid rapidly heating or overheating windshield.

Question 18

What does the PLT WDO / HT switch do?

Answer 18

Captain side window heat.

Question 19

What happens if the windshield overheats? How would you reset the associated caution light.

Answer 19

associated caution light and master caution, the main windows can be re-set by switching off then on, automatically switch off. the side window must be manually switched off.

Question 20

What controls operation of the wrap around heaters?

Answer 20

Automatically come on via a thermostat (<15deg).

Question 21

When flying in icing conditions what position should the ignition switches be set at?

Answer 21

Manual.