1 Icing • Two kinds: Induction and Structural • Induction Icing: Icing in the power plant – Carburetor Icing • Air is cooled with adiabatic expansion and endothermic evaporation of the fuel. • Cooled below 0 o C and Ice forms • Carburetor icing is 51% of all icing accidents • Can occur in SKC with OAT well above freezing • Check your POH for when carburetor heat is needed Ch 13 Sec A
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1 Icing Two kinds: Induction and Structural Induction Icing: Icing in the power plant –Carburetor Icing Air is cooled with adiabatic expansion andendothermic.
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Icing• Two kinds: Induction and Structural
• Induction Icing: Icing in the power plant– Carburetor Icing
• Air is cooled with adiabatic expansion andendothermic evaporation of the fuel.
• Cooled below 0oC and Ice forms• Carburetor icing is 51% of all icing accidents• Can occur in SKC with OAT well above freezing• Check your POH for when carburetor heat is needed• Carb Heat reduces power, but is better than no power
– Jet Engine: Can develop ice in taxi, takeoff, & climb
Ch 13
Sec A
2
Icing• Two kinds: Induction and Structural
Ch 13
Sec A
3
Icing• Two kinds: Induction and Structural
Ch 13
Sec A
4
Icing• Structural Icing: Icing on the Airframe(The
outside of the airplane)–Skin temperature is 0oC or less–Decrease lift efficiency of the wings–Clogs the pitot-static system–Bad altitude, VSI, and KIAS due to
clogged Pitot–Adds weight to plane: may be several
hundred pounds of ice.
Ch 13
Sec A
5
Icing• Structural Icing
– Types of ice protection• Anti-icing: prevents ice from forming eg.
Heated wing edges• De-icing: Removes ice after it has formed eg.
Inflatable wing boots– Ground Icing: Occurs on the ground
• Usually from FZRA for FZDZ or SN• Can even happen to hangared planes on taxi• Do not assume takeoff roll will knock of ice!!• Remove all ice, snow and frost before takeoff• If it is still accumulating don’t take off!!!
Ch 13
Sec A
6
Icing• Structural Icing
–An 1/8 inch coating of ice can reduce lift by 30% and increase drag by 40%.
–A hard frost can increase stalling speed by 5 to 10%
Ch 13
Sec A
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Icing• Observing and Reporting Structural Icing• Three types of ice: clear, rime, & mixed.
– Rime Ice: • Forms on surfaces by small droplets trapping air bubbles
usually -15oC• Usually white or opaque milky color
– Clear Ice:• Forms between 0oC and -5oC• Maybe translucent or a glaze• Heavy and Hard• Adheres strongly to the aircraft• Disrupts airflow over the wing
– Mixed Ice: forms from -5oC to -15oC
Ch 13
Sec B
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Icing• Observing and Reporting Structural Icing
Ch 13
Sec B
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Icing PiReps• AIZ UA /OV SHY321028 /TM 1609 /FL160 /TP AC68 /SK SKC /WX FV99SM /TA
M09 /WV 33045KT /RM SMTH • IKK UA /OV IKK360012 /TM 1815 /FL035 /TP C210 /SK SKC /TA M02 /TB MOD • DEC UA /OV DEC /TM 1832 /FLUNKN /TP P28A /SK FEW-SCT052 /WX
FV20SM /TB LGT /RM UPDRAFTS OF 100FT PER MIN • SGF UA /OV SGF360015 /TM 2238 /FL350 /TP WW24 /SK SKC /WV 33879KT /TB
INTMT-CONT LGT CHOP • IRK UA /OV IRK090020/TM 2336/FL230/TP C425/TA M23/IC LGT-MOD RIME/RM
FM ZKC • IRK UA /OV IRK240040/TM 2353/FL220/TP B737/TA M19/IC LGT MX 190-220/RM
FM ZKC • MCI UA /OV BQS /TM 0048 /FLUNKN /TP B717 /TA M02 /IC TRACE RIME 150-