Exam (elaborations)
Air Evac Icing Exam with Complete Solution
- Course
- Institution
Air Evac Icing Exam with Complete Solution
[Show more]
Content preview
Air Evac Icing Exam with Complete SolutionAltitude wise, where does most icing occur? - ANS-50% between 5000 and 13,000 with
the peak at 10,000.
An aircraft with what type of fuel tanks can be particularly susceptible to icing? - ANS-
flush mounted fuel tanks
At what airspeed does icing become negligible? - ANS-575 kts, due to surface heating
from friction.
At what temperature does pure water suspended in air freeze? - ANS--40 C
At what temperature range does most icing occur? - ANS-Between O and -20 with 50%
between -8 and -12C
At what temperature to liquid droplets freeze without a nucleus? - ANS--40 C
Define forecast icing conditions: - ANS-Environmental conditions expected by the
National Weather Service or an FAA- approved weather provider to be conducive to the
formation of inflight icing on aircraft.
Describe the difference between how small and large droplets freeze on the airframe -
ANS-small droplets tend to form on the leading edges,
larger droplets cross streamlines and freeze further back
Explain how freezing rain forms in a front. - ANS-Warm, humid air lifts until rain is
formed
rain falls through front to colder air and becomes supercooled
if cold layer is shallow, freezing rain at surface
if cold layer is deep, ice pellets at surface.
GOM: If pilots encounter icing, what are their actions? - ANS-immediately remove
aircraft from icing, or land as soon as possible.
Report icing to Tier one OCC or FSS as soon as possible.
How do mountains create conditions more likely for icing? - ANS-Mechanical uplift
pushes supercooled water droplets far above the freezing level.
How does aircraft speed affect icing? - ANS-The rate of supercooled water droplet
impact increases with airspeed
How does ice accumulate on rotor blades? - ANS-From the root moving outward.
How does Rime Ice deposit on the airframe? - ANS-from forward edges back
, How high above mountains does an icing area typically exist? - ANS-5000 feet above
the mountains, unless cumuliform clouds develop.
How is clear ice formed? - ANS-by the relatively slow freezing of large, supercooled
water droplets.
How is Rime Ice formed? - ANS-instantaneous freezing of small supercooled water
droplets when they strike the aircraft
How will the icing area be distributed along a cold front with showers or thunderstorms?
- ANS-In a comparatively narrow band along the front.
In a front with warm stable air, what icing may be expected? - ANS-may be continuous
over an extended area.
In a front with warm unstable air, what icing may be expected? - ANS-Icing may be
sporadic.
In most cases, Supercooled liquid water content is low. T/F - ANS-True
In stratiform clouds, how many feet of altitude will icing generally be limited to? - ANS-
3000-4000 feet.
In what conditions are SLDs common? - ANS-Freezing Rain
Freezing Drizzle
In what portion of the cumuliform cloud is icing most intense? - ANS-upper portion of the
cloud where updraft is concentrated and SLDs are plentiful.
Is vibration from ice shedding worse in 2 or 4 blade systems? - ANS-2 blade is worse.
Under what conditions does icing tend to occur? - ANS-Rime Ice Colder than -15C
Clear Ice Warmer than -10C
Mixed in between.
What are large drops of supercooled water called? - ANS-Supercooled Large Drops
(SLDs)
What are the categories of icing? - ANS-Trace- perceptible. Accumulation slightly
greater than sublimation.
Light- problem if over 1 hour. Occasional use of deice.
Moderate- deice necessary, short encounters potentially hazardous.
Severe- ice protection fails to remove accumulation
What are the hazards associated with mountain icing? - ANS-May not be able to
descend below freezing level
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller LUCKYSTAR2022. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79373 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now