What altitude concept ensures obstacle clearance even off-route?

What altitude concept ensures obstacle clearance even off-route?

• A. MORA
• B. MEA
• C. MOCA
• D. QNH

Answer: (A)

Minimum Off-Route Altitude is the publication that ensures obstacle clearance even when you’re off the planned route. It’s calculated to provide a safety margin over terrain and obstacles within the defined off-route area, so you remain clear of hazards regardless of deviations from the centerline. In contrast, the minimum enroute altitude protects you along the route itself, not off it; MOCA only guarantees clearance within 25 NM of a navigation aid, so beyond that you can’t rely on it for obstacle clearance. QNH is simply the local pressure setting for altimeters, not related to obstacle clearance. Hence, the concept that ensures obstacle clearance even off-route is Minimum Off-Route Altitude.

Minimum Off-Route Altitude is the publication that ensures obstacle clearance even when you’re off the planned route. It’s calculated to provide a safety margin over terrain and obstacles within the defined off-route area, so you remain clear of hazards regardless of deviations from the centerline. In contrast, the minimum enroute altitude protects you along the route itself, not off it; MOCA only guarantees clearance within 25 NM of a navigation aid, so beyond that you can’t rely on it for obstacle clearance. QNH is simply the local pressure setting for altimeters, not related to obstacle clearance. Hence, the concept that ensures obstacle clearance even off-route is Minimum Off-Route Altitude.