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SAWS Workshop II October 2008 Jamie Gudmestad - Meteorologist Intern WFO Midland, TX - Air Force Reserve Weather Forecas PowerPoint Presentation
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SAWS Workshop II October 2008 Jamie Gudmestad - Meteorologist Intern WFO Midland, TX - Air Force Reserve Weather Forecas - PowerPoint PPT Presentation


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AIRCRAFT ICING. SAWS Workshop II October 2008 Jamie Gudmestad - Meteorologist Intern WFO Midland, TX - Air Force Reserve Weather Forecaster Shaw AFB, SC. Aviation Safety Foundation. My employment Full time – Meteorologist WFO Midland Part time – Forecaster for various areas in the

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Presentation Transcript
slide1

AIRCRAFT ICING

SAWS Workshop IIOctober 2008Jamie Gudmestad- Meteorologist InternWFO Midland, TX- Air Force ReserveWeather ForecasterShaw AFB, SC

Aviation Safety Foundation

slide2

My employment

Full time – Meteorologist WFO Midland

Part time –

Forecaster

for various

areas in the

Middle East

Wikipedia

slide3

Content of this presentation

  • Why icing is SO important to aviation
  • Where and when icing commonly occurs
  • The types of icing
  • Type of aircraft most susceptible to icing
  • TAFs and other products
  • Future icing detection
  • Where more information can be found
slide4

The National Weather Service (NWS) provides weather, hydrologic, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property.

slide5

Study by the National Transportation

Safety Board

"An estimated 819 people died in accidents related to in-flight icing between 1982 and 2000."

Over 40 people/year

www.airport-technology.com

slide6

American Eagle 4184

October 31, 1994

Roselawn, Indiana

Crashed after circling in icy weather

killed all 68 on board

Airlines.net

slide7

Air Florida Flight 90

January 13, 1992

Washington DC

Aircraft was De-iced, then sat on the runway

killed all 78 on board

Airdisaster.com

slide8

A Cessna 208B Caravan

November 8, 2002

Parks, Arizona

Aircraft was in route from Las Vegas, NV on its way to Midland, TX

Moderate mixed icing

aironline.com/wikipedia

slide9

Airfoil

Normal

Iced

Hanley Innovations:

Airfoil Icing & Microtab Study

slide10

Icing of other aircraft parts

AOPA Aviation Safety Foundation

slide11

Icy Runways

Webshots.com

slide12

Key Ingredient

  • Near Saturated environment
  • Favorable Atmospheric Conditions for Icing:

Temperature Dew point Depression Approx. RH

0° to -7°C (32 to 18°F) less than 2°C (<3.6°F) 85%

-8 to -15°C (17 to 5°F) less than 3°C (<5.4°F) 80%

-16 to -22°C (4 to -8°F) less than 4°C (<7.2°F) 75%

AFWA TN 98-002

slide13

Winter

Map from the Air Safety Foundation (AOPA)

slide14

Mountains

  • Icing is more likely & more severe in clouds located near moisture sources & over mountainous regions

University Corporation for Atmospheric Research (COMET)

slide15

Fronts

University Corporation for Atmospheric Research (COMET)

slide16

Fronts

University Corporation for Atmospheric Research (COMET)

slide17

Clouds

Icing Risk/Type of Clouds

Cumulus Stratiform Rain & Drizzle

HIGH 0° to -20°C 0° to -15°C 0 °C & below

(32° to -4°F) (32° to 5°F) (32°F & below)

MED -20° to -40°C -15° to -30°C

(-4° to -40°F) (-5° to -22°F)

LOW < -40°C < -30°C

(< -40°F) (< -22°F)

AOPA Aviation Safety Foundation

slide19

Icing Severity definitions

  • Trace – “when the rate of ice accumulation is just slightly
  • greater than the rate of loss due to sublimation”
  • Light – “the rate of ice accumulation may create a problem
  • if the aircraft remains in this environment for one hour
  • or more”
  • Moderate – “when the rate of ice accumulation is so great
  • that even a short encounter can become hazardous”
  • Severe – “whenever the rate of ice accumulation is such that
  • deicing or anti-icing equipment cannot control or reduce
  • the hazard”

University Corporation for Atmospheric Research (COMET)

slide20

Droplet Size

  • Cloud droplets – usually 40 microns or less
  • Supercooled liquid droplets (SLD) are
  • 40 – 200 microns; MOST SIGNIFICANT to
  • Aircraft Icing

- SLD most often includes freezing rain & drizzle

University Corporation for Atmospheric Research (COMET)

Fotosearch.com

slide23

Type of aircraft

US Army Corps of Engineers; Wikipedia

slide24

Type of Icing

Temperature Type

32° to 18°F Clear

18°F to 15°F Mixed

Less than 15°F Rime

AFWA TN 98-002

slide25

TAFS

NWS TAF:

CCCC TAF 011818 18020G28KT P6SM SCT030 BKN120

TEMPO 1822 BKN020

FM0400 16015KT P6SM BKN030 PROB30 0308 TSRA BKN030CB

USAF TAF:

CCCC TAF 011616 03008KT 0800 PRFG FEW000 BKN005 BKN012 WS015/12035KT QNH3001INS FG FEW002

TEMPO 1820 14012G18KT 3200 -SN BLSN FEW002 OVC006 620065 SN FEW000

BECMG 2324 15012G20KT 3200 -SN BLSN FEW002 OVC004 620046 QNH2983INS TM01/19Z TM04/11Z

NWS Instruction 10-813 / AFMAN 15-124

slide26

Reading the icing group

620065

6 The first digit – icing group

2 The second digit – type of icing

006 The third, fourth & fifth digits – height of icing

5 The last digit – thickness of icing

AFMAN 15-124

slide30

Altitude

Schultz-Politovich PIREP study - University Corporation for Atmospheric Research (COMET)

slide31

Research

  • Supercooled
  • large droplet

- Heat transfer

  • Anti-icing
  • protection

http://www.niar.wichita.edu/researchlabs/

slide32

Technology improvements

More advanced

RADARs are

being tested by

National Center

for Atmospheric Research

www.ucar.edu/communications

slide33

Where you can learn more

The Comet program

http://www.meted.ucar.edu/

AOPA Air Safety Foundation

http://www.aopa.org/asf/

slide34

Aircraft Icing

Thank you for your time!

Questions???

Sources were cited on each slide