TD 51

Question 1

When selecting a landing site, what is the minimum diameter of a landing point for sling load operations?

Answer 1

CH-47: 80 meters
Sling load ops: 100 meters
Sling load long line: 125 meters
Sling load NVG: 150 meters

make sure the landing area is cleared of all obstacles that may cause damage to the rotor blades or the underside of the aircraft (4-48.09 pg. 4-2, table 4-1)

Question 2

During external load hookup, what is the first area to be coordinated between the ground crew and the aircraft crew in the event of an aircraft emergency?

Answer 2

Aircraft emergency landing area
an area established by aircrew for where the helicopter should reposition in the event of an emergency. (4-48.09, pg.3-9)

Question 3

Which type of spatial disorientation is considered the most dangerous?

Answer 3

Type 1 (unrecognized)
    the aviator does not perceive any indications of SD or necessarily think anything is wrong. (TC 3-04.93, pg.9-4)

Question 4

What vestibular illusion can give rise to an overwhelming “tumbling” sensation?

Answer 4

Coriolis illusion
The illusion of tumbling coming from a sustained turn and then changing the orientation of your head so that the vestibular system feels like your moving in a different direction suddenly (3-04.93, pg.9-16)