Anti-Ice

Question 1

During NAC HT ground checks what does a momentary Amber NAC HT indicate?

Answer 1

This is a Disagreement light.
Either 6psi+valve open
Or
Pressure bleeds off+ valve closed

Question 2

What are the NAC HT Limits on the ground?

Answer 2

Without engine running: 5 seconds
Engine on: >15°C=30 seconds

Do not use >65%N1 except for take off

Question 3

In the event of an electrical failure what will happen to NAC HT

Answer 3

NAC HT and Stator heat fail ON

Question 4

Windshield Heat comes from where?

Answer 4

LP manifold Bleed air

Question 5

How long does WS HT take to fully open?

Answer 5

Takes 15 seconds for valve to fully open and fully close

Question 6

Explain WS HT Over heat conditions.

What are the high and low limits on the ground and in the air?

Answer 6

There are low limit (250°F ground) and high limit (347°F airborne) thermoswitches installed.

Question 7

WING HT comes from where?

Answer 7

LP manifold (HP as back up)

Question 8

What are the underheat/overheat conditions that would bring on the WING HT annunciation with STAB HT switch on

Answer 8

<58°F Underheat

>215°F Overheat

Question 9

What is the function of the HP solenoid in regard to STAB HT?

Answer 9

With temp sensors below 600°F, electrical power is applied which opens the HP solenoid allowing HP air to help maintain wing heat in normal range during reduced engine rpm operations.

Question 10

During ground ops of the STAB HT (Batt charging bus) on the ground (squat switch) what is the solid light indicate as opposed to flashing?

Answer 10

If solid light on the ground this indicates good self test and normal ops

If flashing on the ground this indicates a failure of the self test.

Question 11

STAB HT steady light on in the air, what does this indicate?

What if its flashing in the air?

Answer 11

Either a failure or malfunction, check amps for indication

If flashing this means the Parting Element is gone.

Question 12

With WSHLD DEFOG in operation what is an under temp and what is an over temp?

Answer 12

<85°F equals an under temp

> 150°F equals an over temp

Question 13

What temp does WSHLD DEFOG in normal keep? What about in low?

Answer 13

110°F in normal

95°F in low

Question 14

WSLD DEFOG power comes from where?

Answer 14

Electrical power is supplied by two L WSHLD circuit breakers (one DC and one AC) on the pilot side

Also two R WSHLD circuit breakers (one DC and one AC) on the copilot side

Question 15

Windshield alcohol is available to the pilot side only, how many Gallons and how long is ops available? When would you get a ALC LOW caution light?

Answer 15

2.35Gallons
45min of ops Captain side only
ALC LOW= 10% low triggered float switch