Flight Instructor for Airplane Category › II. Technical Subject Areas › Task L. Water and Seaplane Characteristics, Seaplane Bases, Maritime Rules, and Aids to Marine Navigation (ASES, AMES)

AI.II.L.K1b

Knowledge

Characteristics of a water surface as affected by features, such as:

Protected and unprotected areas

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Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aeronautical Information Manual p. 7-1-46
Chapter 7. Safety of Flight › Section 1. Meteorology › 7-1-19. PIREPs Relating to Airframe Icing
hour on the unprotected part of the outer wing. The pilot should consider exiting the icing condition as soon as possible. 4. Severe. The rate of ice accumulation is such that ice protection systems fail to remove the accumulation ... such as areas aft of protected surfaces and any other areas identified by the manufacturer. A representative accretion rate for reference purposes is more than 3 inches (7.5 cm) per hour on the unprotected part of the outer wing…
Aeronautical Information Manual p. PCG I-1
Pilot/Controller Glossary › I
hour on the unprotected part of the outer wing. The pilot should consider exiting the icing condition as soon as possible. d. Severe- The rate of ice accumulation is such that ice protection systems fail to remove the accumulation ... such as areas aft of protected surfaces and any other areas identified by the manufacturer. A representative accretion rate for reference purposes is more than 3 inches (7.5 cm) per hour on the unprotected part of the outer wing…
Aeronautical Information Manual p. 10-2-17
Chapter 10. Helicopter Operations › Section 2. Special Operations › 10-2-3. Landing Zone Safety
operations in these areas. 2. Hazardous materials of concern are those which are toxic, poisonous, flammable, explosive, irritating, or radioactive in nature. Helicopter ambulance crews normally don’t carry protective suits or breathing apparatuses to protect them from hazardous materials ... before loading on the aircraft for the medical crew’s protection, or may be transported by other means. 4. Hazardous chemicals and gases may be fatal to the unprotected person if inhaled or absorbed through the skin. 5. Upon initial…
Pilot Guide: Flight in Icing Conditions p. 5
Chapter 1. INTRODUCTION › 1-3. DEFINITIONS › z. One-Minute Weather
protected surfaces and running back to unprotected surfaces. gg. Severe Icing. The rate of ice accumulation is such that ice protection systems fail to remove the accumulation of ice and accumulation occurs in areas not normally prone to icing, such…
Airplane Flying Handbook p. 13-9
Chapter 13: Transition to Multiengine Airplanes › Operation of Systems › Anti-Icing/Deicing Equipment
frequently provided in the AFM/POH. Anti-icing/deicing equipment only eliminates ice from the protected surfaces. Significant ice accumulations may form on unprotected areas, even with proper use of anti-ice and deice systems. Flight at high angles of attack…