Ice/Rain Protection Flashcards
What are the protected areas on the Hawker for anti-ice?
Windscreens, air data probes, ice detector, main wing leading edges, horizontal stabilizer leading edges, and engine inlet cowling
Is the Hawker anti-ice or de-ice?
Anti-ice
What does the ice detection system include?
Rotary cutter ice detector and ice detection light
What does the AUTO and OVRD settings do on the ice rotary cutter?
AUTO: operates when weight off wheels (left main)
OVRD: operates continuously on ground and inflight
How is the rotary ice cutter powered?
AC power from XS2 bus
How does the rotary ice cutter work to detect ice?
When ice forms, rotary cutter shaves ice, which increases torque on the rotor - when the torque is increased, a white ICE DETECTED annunciator is illuminated in the cockpit
What are some examples of other ice detection systems on different aircraft?
Rosemount: vibration and heat of transformation
Sunstrand: Strontium 90 radiation
Vibro-Meter: vibrations
Simmonds Precision: pulse-amplitude
When does the white ICE DETECTED annunciator indicate? When does it extinguish?
Ice has formed on the rotary cutter - extinguishes when icing ceases plus 60 second delay
What are the ice lights used for?
Visual inspection of the leading edges of both wings for night conditions, controlled by the ICE/LOGO switch and powered by the PS1 bus
What is the main airframe anti-ice system?
TKS fluid for wing and horizontal stabilizer leading edges
At what temperatures should you not have the TKS system activated?
Below -28ºC
What is the capacity of the TKS tank? How much protection is given, in minutes?
10 gallon tank capacity, providing ~ 108 minutes of protection
At what capacity does the TKS fluid gauge indicate FULL? 1/4? EMPTY?
At FULL, there are (at least) 8.25 gallons of TKS fluid, at 1/4 there are 30 minutes left, at EMPTY there are around ~12 minutes of protection left
How is the TKS system controlled in the cockpit? What are some special considerations of the TKS fluid system?
Rotary timer on overhead panel, allowing 10 minute intervals - the first minute of activation provides a higher flow rate of fluid, must be primed for 2 minutes before flight
What does an ANTICE LO PRESS annunciator indicate?
Low system pressure with pump on
What does an ANTICE LO QTY annunciator indicate?
30 minutes of TKS fluid left
What drives the windscreen and sidescreen heat?
Engine alternators
What alternator powers each windscreen, sidescreen, and stall vane heat?
No.1 Engine Alternator:
- Left windscreen heat
- Right sidescreen heat
- Left stall vane heat
No.2 Engine Alternator
- Right windscreen heat
- Left sidescreen heat
- Right stall vane heat
What happens to the windscreen/sidescreen heat if one engine alternator fails?
Remaining alternator powers both windscreens but sidescreens are shed
How is windscreen heat controlled?
L/R SCREEN HEAT switch on overhead panel: Normal heat provided with switch on, higher level with switch on and engine anti-ice switch selected on
What does a L/R SCREEN OVHT and SIDE SCRN OVHT annunciator indicate?
Indicates overheat condition on the windscreen or sidescreen; controlled at higher temperatures by removing power
How does the engine anti-ice protection function?
Bleed air from each engine used for anti-ice of respective engine - controlled by ENG 1/2 ANTICE switches on overhead panel which operates electrically controlled, pneumatically operated valves
How do the valves for the engine bleed air anti-ice work?
Valves are de-energized open (when power is lost, valves default to an open state - must be powered to close valves)
In the ON position for the ENG 1/2 ANTICE switch, what happens?
P2T2 probe in engine inlet is heated, and associated windscreen heat temperature is increased
