FAA Navigation Aids (NAVAIDs) 3

Question 1

On a sectional chart, the mileage shown between two waypoints along a Victor airway is measured in what units?

Accepted Answer

Nautical miles

Answer

Distances along airways and between waypoints on sectional charts are always expressed in nautical miles (nm).

Question 2

What does 'MEA' printed alongside a Victor airway on a sectional chart stand for?

Accepted Answer

Minimum Enroute Altitude

Answer

MEA (Minimum Enroute Altitude) is the lowest published altitude along an airway segment that ensures obstacle clearance and adequate signal reception from NAVAIDs.

Question 3

What is the purpose of the 'MOCA' value sometimes shown along Victor airways on sectional charts?

Accepted Answer

It is the Minimum Obstacle Clearance Altitude, guaranteeing terrain clearance but only NAVAID reception within 22 nm of a VOR

Answer

The MOCA (Minimum Obstruction Clearance Altitude) ensures obstacle clearance along the full route but only guarantees VOR signal reception within 22 nautical miles of the VOR.

Question 4

On a sectional chart, an 'off-route obstruction clearance altitude' (OROCA) value in a grid box ensures what?

Accepted Answer

1,000 feet above highest obstacle in non-mountainous areas; 2,000 feet in designated mountainous areas

Answer

The OROCA gives 1,000 feet obstacle clearance in non-mountainous areas and 2,000 feet in designated mountainous areas within each latitude/longitude grid square on sectional charts.

Question 5

On a sectional chart, what does 'T' printed in the corner of a NAVAID data box signify?

Accepted Answer

Terminal VOR with limited service volume (25 nm, 12,000 feet)

Answer

A 'T' in the NAVAID box designates a Terminal VOR (TVOR) with a service volume limited to 25 nautical miles and 12,000 feet altitude, suitable only for terminal area navigation.

FAA - Sectional Chart Practice Test

FAA - Sectional Chart Practice Test

FAA Navigation Aids (NAVAIDs) 3