Question id 387 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

Preflight Preparation - (Refer to figure 20 area 4.) What hazards to aircraft may exist in restricted areas such as R-5302B?
High volume of pilot training or an unusual type of aerial activity
Unusual, often invisible, hazards such as aerial gunnery or guided missiles
Military training activities that necessitate acrobatic or abrupt flight maneuvers

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane