Met PPL exam

Meteorology for PPL exam

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  • Created by: Gul
  • Created on: 06-06-09 09:14

Freezing Rain

  • Supercooled rain drops fall from cloud base to a/c = Ice formation
  • Aircraft skin subzero temps, supercooled drops freeze
  • Rapid build up of clear ice

Pilot action: DESCEND TO CRUISE BELOW FREEZING LEVEL.

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Anti & De-icing

  • Prevent ice: Channel heat through electrical devices
  • De-ice: Remove ice after formed by de-icing boots

Deicing boots:

  • Flexible cells isntalled along L.E of eings
  • Inflated to break ice + allow wind to shed it onto passing airflow.
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Frost

  • Frozen Dew
  • Can disrupt airflow over wing (reducing lift)
  • Preflight
  • Can be removed by washing
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Hoar Frost

  • COLD SOAKING:
  • When a/c crusing at high alt for few hours, airframe finally cools to same temp as outside air
  • When cold soaked, a/c descends into layer of warm, humid air
  • Water vapour can skip liquid state + turn to ice (DEPOSITION)
  • This ice coat = HOAR FROST
  • Little impact on a/c perf
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Thunderstorms - Stage 1

Stage 1 (towering cumulus stage)

  • Surface warming: uplift of warm air
  • Rapid updrafts caused by release of latent ht/condensation
  • VIrga
  • Moderate/severe airframe icing
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Thunderstorms - Stage 2

Stage 2 (mature stage)

  • Convective cells form up/downdrafts
  • Downdrafts - evaporation in falling raindrops
  • latent ht absorbed from air
  • cooling downdraft formed
  • Attains highest altitude (top of troposphere)
  • Rain+ hail well dvlped.
  • Lightning
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Thunderstorms -Stage 3

Stage 3 (dissipating stage)

  • Downdrafts predominant over updrafts
  • Microbursts (extremely strong downbursts)
  • When temp of cloud = temp of environment, dissipation complete.
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