Page 157 - The Jet Engine

13: Ice protection

Contents Page

Introduction 147

Hot air system 149

Electrical system 150

2. An ice protection system must effectively prevent
ice formation within the operational requirements of
the particular aircraft. The system must be reliable,
easy to maintain, present no excessive weight
INTRODUCTION penalty and cause no serious loss in engine
performance when in operation.
1. Icing of the engine and the leading edges of the
intake duct can occur during flight through clouds 3. Analyses are carried out to determine whether
containing supercooled water droplets or during ice protection is required and, if so, the heat input
ground operation in freezing fog. Protection against required to limit ice build up to acceptable levels. Fig.
ice formation may be required since icing of these 13-1 illustrates the areas of a turbo-fan engine
regions can considerably restrict the airflow through typically considered for ice protection.
the engine, causing a loss in performance and
possible malfunction of the engine. Additionally, 4. There are two basic systems of ice protection;
damage may result from ice breaking away and turbo-jet engines generally use a hot air supply (fig.
being ingested into the engine or hitting the acoustic 13-2), and turbo-propeller engines use electrical
material lining the intake duct. power or a combination of electrical power and hot

147