Flight Training - November 2012 - 29

ICY OPTIONS
There are a number of different types of icing. Here are four common varieties: CLEAR ICE, sometimes called glaze, looks most like the icicles you sucked on as a kid. It has a generally smooth texture with small air pockets that result in a bumpy surface. With high levels of accretion, it can form “horns” that stick up from leading edges. RIME ICE is rough, milky, and forms rapidly from supercooled droplets. This type generally forms to the shape of the wing leading edge, which makes identification easier. MIXED ICE is, as the name implies, a combination of rime and clear ice. It has the color and characteristics of both. FROST settles on the airplane while it’s on the ground. It’s not unlike what you’ll find on your car or other metal structure. Don’t take off with any of it on the airplane because it can reduce lift by up to 30 percent.

30%
might have to raise the stakes by announcing your situation as urgent, or worse, although that’s something you may end up doing soon regardless. What about diverting? That could mean flying numerous vectors in icing conditions, followed by an approach to an unfamiliar airport (assuming you brought the proper charts along and not just the ones you expected to use at the destination—a mistake some pilots make). As with the preceding option, the question of how much time you would spend in the ice is the major factor. But it’s a strong candidate. You could turn around—but that would mean a new route clearance, perhaps an altitude change, and at least as much time in the clouds as you have already flown. You could plow ahead and hope. Those are the choices. Right now you have to do two things: evaluate them on the quick, while immediately doing everything you can to offset the ice accumulation. For starters, turn on the pitot heat; knowing that you can trust your airspeed indication is essential. Speed up the prop; increasing rpm might shake loose some ice and retard further accumulation. It may also smooth out the ride, relieving more stress. Check for carb ice. Note the time and update your mental math about fuel remaining. Concerning those escape options, you can count on this much: None of them will be the perfect answer. Only breaking out unexpectedly into clear air would be a jackpot of that sort. Then the next course of action, as the Aeronautical Information Manual recommends, would be to maintain VFR conditions and land as soon as possible. Otherwise, you are going to have to choose between options that all require some continued exposure to the icing. It’s time to let ATC know what’s going on. They might be able to provide a vector to a nearby approach, or a call-out to nearby aircraft for a pirep on their flight conditions. Wouldn’t it be nice to hear someone say they’re flying in the clear nearby? Be ready to choose your plan, because once ATC provides you with information, they will ask for your intentions. (They will also stay with you until you are safe.)
AVOIDANCE STARTS AT HOME. What the scenario painted above illustrates is that whenever an instrument flight is likely to put you in the clouds at or near freezing temperatures, an avoidance plan is called

WING ICE REDUCES LIFT BY UP TO

NOVEMBER 2012 FLIGHT TRAINING

/ 29



Flight Training - November 2012

Table of Contents for the Digital Edition of Flight Training - November 2012

Flight Training - November 2012
Contents
President’s Perspective
Right seat
Letters
Southern Exposure
How It Works
ASI News
Success Story
News
Since You Asked
News Final Exam
Tech Tip
AOPA Action
Checkride
Flying Carpet
Icy Reception
Beyond All Expectations
Technique
Weather
Flight Lesson
Voices of Reason
Tech Talk
Keep Students Stoked
He Said 'Yes' But Means 'No'
Night Moves
Advertiser Index
Debrief
Flight Training - November 2012 - Flight Training - November 2012
Flight Training - November 2012 - Cover2
Flight Training - November 2012 - Contents
Flight Training - November 2012 - 2
Flight Training - November 2012 - 3
Flight Training - November 2012 - President’s Perspective
Flight Training - November 2012 - 5
Flight Training - November 2012 - Right seat
Flight Training - November 2012 - 7
Flight Training - November 2012 - Letters
Flight Training - November 2012 - 9
Flight Training - November 2012 - Southern Exposure
Flight Training - November 2012 - 11
Flight Training - November 2012 - How It Works
Flight Training - November 2012 - ASI News
Flight Training - November 2012 - Success Story
Flight Training - November 2012 - News
Flight Training - November 2012 - Since You Asked
Flight Training - November 2012 - 17
Flight Training - November 2012 - News Final Exam
Flight Training - November 2012 - Tech Tip
Flight Training - November 2012 - AOPA Action
Flight Training - November 2012 - Checkride
Flight Training - November 2012 - 22
Flight Training - November 2012 - 23
Flight Training - November 2012 - Flying Carpet
Flight Training - November 2012 - 25
Flight Training - November 2012 - Icy Reception
Flight Training - November 2012 - 27
Flight Training - November 2012 - 28
Flight Training - November 2012 - 29
Flight Training - November 2012 - 30
Flight Training - November 2012 - 31
Flight Training - November 2012 - Beyond All Expectations
Flight Training - November 2012 - 33
Flight Training - November 2012 - 34
Flight Training - November 2012 - 35
Flight Training - November 2012 - Technique
Flight Training - November 2012 - 37
Flight Training - November 2012 - Weather
Flight Training - November 2012 - 39
Flight Training - November 2012 - 40
Flight Training - November 2012 - Flight Lesson
Flight Training - November 2012 - 42
Flight Training - November 2012 - 43
Flight Training - November 2012 - 44
Flight Training - November 2012 - Voices of Reason
Flight Training - November 2012 - 46
Flight Training - November 2012 - 47
Flight Training - November 2012 - Tech Talk
Flight Training - November 2012 - Keep Students Stoked
Flight Training - November 2012 - He Said 'Yes' But Means 'No'
Flight Training - November 2012 - Night Moves
Flight Training - November 2012 - Advertiser Index
Flight Training - November 2012 - 53
Flight Training - November 2012 - 54
Flight Training - November 2012 - 55
Flight Training - November 2012 - Debrief
Flight Training - November 2012 - Cover3
Flight Training - November 2012 - Cover4
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