What is the term for the rotor head striking the mast on underslung rotors?

What is the term for the rotor head striking the mast on underslung rotors?

• A. Mast Bumping
• B. Mast
• C. Night
• D. NAVAID

Answer: (A)

In underslung rotor systems, the rotor head sits close to the mast and can physically come into contact with it under certain flight conditions. When the rotor head actually strikes the mast, that event is called mast bumping. It’s described this way because it specifically refers to the rotor head “bumping” or striking the mast, which is a hazardous situation that can lead to structural damage if it occurs. The other terms don’t fit because they refer to the mast itself, a time-of-day condition, or a navigation aid, none of which describe the contact between the rotor head and the mast.

In underslung rotor systems, the rotor head sits close to the mast and can physically come into contact with it under certain flight conditions. When the rotor head actually strikes the mast, that event is called mast bumping. It’s described this way because it specifically refers to the rotor head “bumping” or striking the mast, which is a hazardous situation that can lead to structural damage if it occurs. The other terms don’t fit because they refer to the mast itself, a time-of-day condition, or a navigation aid, none of which describe the contact between the rotor head and the mast.