Flight Training - February 2012 - 12

PREFLIGHT»

DEICE BOOTS
Using air to rid the airplane of ice
WITHOUT PROPER EQUIPMENT, flying an airplane in icing conditions is a dangerous proposition. But with a deice or anti-ice system installed, this type of operation can be done safely in certain conditions. Deice boots are a common method with which to shed ice off the aircraft’s forward-facing surfaces. They can be operated either pneumatically with bleed air from a turbine engine or with an engine-driven air pump (vacuum pump) on a piston aircraft.

HOW IT WORKS

BY IAN J. TWOMBLY

The deice boots are divided into multiple sections along each forward surface so that airflow isn’t disturbed over the entire span. Within each section, the boot itself features multiple chambers where air is pumped in at different times. As a result, airflow is less affected, and ice is shed more cleanly. The process begins when a pilot selects the deice system to be active in the cockpit. Then the air from the engine or the pump is fed through a series of tubes and various stages such as an air/oil separator.

The boot operation is controlled by a valve that either sucks (for a pump system) or opens (for a pneumatic system) to allow air to fill each chamber. There are also pressure release valves integrated at this point in the system to ensure the proper amount of air pressure enters the boots, and as a way to exhaust the pressure once the boot needs to deflate. Because the boots operate at different times in the cycle, they must be metered. This is done with a series of switch circuits actuated by solenoid step switches.
WING AIR CHAMBERS

COCKPIT GAUGES

SOLENOID

AIR DUMP

AIR PUMP

ELECTRICAL CONTROL

SUCTION RELIEF VALVE

HORIZONTAL STABILIZER AIR CHAMBERS

PLUS See the boots in action.

FLIGHT INTO KNOWN ICING
Airplanes approved for flight into known icing, or FIKI, are authorized to enter conditions where ice is known to be present. But that doesn’t mean pilots fly on for hours in ice. Even with the best deice or anti-ice system, it’s advised that the pilot get out of icing as soon as practical. FIKI, therefore, is not a license to fly in any condition, but rather a way to safely escape ice when it happens.
STEVE KARP

12 /

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Flight Training - February 2012

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

Flight Training - February 2012
Contents
President’s Perspective
Right Seat
Letters
Human Fuselage
How It Works
Success Stories AOPA Action
Since You Asked
After the Checkride
News
News
Member Benefits
ASI News
Tech Tip
Final Exam
Flight Lesson
Flying Carpet
The Last Six Inches
Preflight Prescription
Body of Work
Technique
Weather
Accident Report
Operational Reminders
Career Advisor
Tech Talk
Be Your Own Entrepreneur
A Little Encouragement, Please
Look Before You Leap
Advertiser Index
Debrief
Flight Training - February 2012 - Flight Training - February 2012
Flight Training - February 2012 - Cover2
Flight Training - February 2012 - Contents
Flight Training - February 2012 - 2
Flight Training - February 2012 - 3
Flight Training - February 2012 - President’s Perspective
Flight Training - February 2012 - 5
Flight Training - February 2012 - Right Seat
Flight Training - February 2012 - 7
Flight Training - February 2012 - Letters
Flight Training - February 2012 - 9
Flight Training - February 2012 - Human Fuselage
Flight Training - February 2012 - 11
Flight Training - February 2012 - How It Works
Flight Training - February 2012 - Success Stories AOPA Action
Flight Training - February 2012 - Since You Asked
Flight Training - February 2012 - 15
Flight Training - February 2012 - After the Checkride
Flight Training - February 2012 - News
Flight Training - February 2012 - News
Flight Training - February 2012 - Member Benefits
Flight Training - February 2012 - ASI News
Flight Training - February 2012 - Tech Tip
Flight Training - February 2012 - Final Exam
Flight Training - February 2012 - Flight Lesson
Flight Training - February 2012 - Flying Carpet
Flight Training - February 2012 - 25
Flight Training - February 2012 - The Last Six Inches
Flight Training - February 2012 - 27
Flight Training - February 2012 - 28
Flight Training - February 2012 - 29
Flight Training - February 2012 - 30
Flight Training - February 2012 - 31
Flight Training - February 2012 - Preflight Prescription
Flight Training - February 2012 - 33
Flight Training - February 2012 - 34
Flight Training - February 2012 - 35
Flight Training - February 2012 - Body of Work
Flight Training - February 2012 - 37
Flight Training - February 2012 - 38
Flight Training - February 2012 - 39
Flight Training - February 2012 - Technique
Flight Training - February 2012 - 41
Flight Training - February 2012 - Weather
Flight Training - February 2012 - 43
Flight Training - February 2012 - Accident Report
Flight Training - February 2012 - Operational Reminders
Flight Training - February 2012 - Career Advisor
Flight Training - February 2012 - 47
Flight Training - February 2012 - Tech Talk
Flight Training - February 2012 - Be Your Own Entrepreneur
Flight Training - February 2012 - A Little Encouragement, Please
Flight Training - February 2012 - Look Before You Leap
Flight Training - February 2012 - Advertiser Index
Flight Training - February 2012 - 53
Flight Training - February 2012 - 54
Flight Training - February 2012 - 55
Flight Training - February 2012 - Debrief
Flight Training - February 2012 - Cover3
Flight Training - February 2012 - Cover4
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