Table of Contents TP 10643
- How to Use This Manual
- Record of Revisions
- Foreword
- Chapter 1 - Air Law, The Clean Aircraft Concept
- Chapter 2 - Theory and Aircraft Performance
- Chapter 3 - Deicing/Anti-icing Fluids
- Chapter 4 - Preventative Measures and Deicing Procedures
- Chapter 5 - Ground Crew Supplement
- Chapter 6 - Aircraft Critical Surface Contamination Examination Questions
- List of Tables
- Acronyms
- Glossary
Spray Pressure
92. During the deicing process, it is a combination of temperature and fluid velocity that dictate the efficiency with which the frozen contaminants are dislodged from the aircraft's surfaces. This is most effectively accomplished with a nozzle spray angle of approximately 45 degrees. The contaminants which are not removed from the surfaces by the initial impact of the fluid are melted off, or debonded, by virtue of the thermal energy contained in the heated deicing fluid.
93. Excess pressure can result in fluid velocities out of the nozzle that can cause impact damage to aircraft components. The aircraft manufacturer should be consulted to ensure that any proposed deicing procedures will not damage the aircraft and render it unsafe for flight.
94. When applying anti-icing (AAF) fluids to the aircraft surfaces only correct pumping equipment must be used to avoid shearing the fluid and thereby destroying the fluid's HOT capacity. The fluid manufacturer should be contacted to determine what methods should be employed in the application of their fluids.