Flashcards
Icing
Cards in this deck (17)
- 1Supercooled dropletsCan be encountered whenever aircraft fly in visible moisture (cloud or precipitation) at temperatures between 0 & -20C (32 to minus 14F)
- 2Especially dangerous clear iceTypically runs 0 to minus 10C
- 3Rime iceSmaller droplets, white appearance, typically forming minus 10 to minus 20C
- 4Mixed iceBlend of clear and rime accumulations favoring the high end of clear ice temperature band. If left to build, can develop double horn or feathery leading edge projections.
- 5SLDSupercooled Large Droplet
- 6SCCDSupercooled Drizzle Drop
- 7Which forms win the prize for fastest, least forgiving accretions?Freezing rain, SLD & SCDD -considered clear icing on steroids where there is splatter, run back so quickly that loss of control may happen in minutes. This type wasn’t even identified until the Roselawn accident.
- 8American Eagle ATR-72The Roselawn Indiana accident from Halloween 1994 where, shuttling in the hold, the Pilots detected high pitch, lowered flaps as a correction, the autopilot repeatedly trimmed up to avoid control loss then it disengaged and the airplane rolled over into a terminal dive.
- 9Aviation Weather center’s changes from RoselawnAddition of SLD to CIP (Current Icing Potential) & FIP (Forecast Icing Potential)
- 10Frequent locales for the most dangerous icing conditionsPacific Northwest, Great Lakes (Roselawn) and New England
- 11By the time you detect icing from windscreen, wings or other surfaces what’s most like happening?At least a ten knot decay in airspeed -verify and expect more as you implement escape plan without flaps.
- 12You have permitted this to happen but now that you’re in it, how should you fly?Flex ailerons and rudder to prevent becoming locked from freezing, turn off auto-pilot, flap free, frequently change RPM and prop speed to keep propeller ice free, verify pitot heat (should have been on long ago), carb heat, if possible change altitude by at least 1000 feet (probably climbing out is not helpful with increasing underside accretions in climb pitch) and/or execute a 180 turn.
- 13Icing aircraft effect level I“Trace”
<10 knot loss, <10% power increase required with no or <10% loss of climb performance and no control or vibration problems - 14Icing aircraft effect level 2“Light”
10-19 knot loss, 10-19% power increase required with no or 10-19% loss of climb performance with no control or vibration problems. - 15Icing aircraft effect level 3“Moderate “
20-39 knot loss, 20-39 % power increase required with at least 20% loss of climb performance with unusually slow or sensitive response from control inputs and may have slight vibration. - 16Icing aircraft effect level 4“Severe”
40 or more knot loss, unable to maintain speed or climb with little control input response and mat have intense buffet and vibration - 17If a tail plane were to stall what would happen?These surfaces lose their downward lift vector, making the tail rise uncontrollably and pitching the nose downward. Having the flaps extended increases the stabilizer’s angle of attack.
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- Flashcards on Icing, created by Dan Anderson on 22/11/2020.
- Created by
- Dan Anderson · Nov 2020
- Updated
- Nov 22, 2020
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