Other Use Airspace

Question 1

MSTN

M

Answer 1

MTRs (Military Training Routes)

Military aircraft on MTRs are exempt from the 250-knot speed limit below 10,000’ MSL. Think of crossing an MTR like crossing a busy street: look both ways, then cross perpendicular to the MTR to reduce the time you are exposed to the hazard. Aircraft should minimize time spent near military training routes, and exercise heightened vigilance when crossing them. Call a nearby flight service station to determine which MTRs are active. Give extra attention to your visual scan when near an MTR.

Question 2

S

Answer 2

SFRA (Special Flight Rules Area)

Question 3

T

Answer 3

TFR (Temporary Flight Restriction)

Question 4

N

Answer 4

NSA (National Security Area)

While not regulatory, and only advised through government request, National Security Areas outline places where pilots are asked to voluntarily avoid flying. They typically surround high-security or sensitive facilities on the ground. Charts mark National Security Areas (NSAs) with a magenta dashed line. The chart includes details for each area, including the altitudes you are requested to avoid.