Enroute Limitations

Question 0

Define MOCA:

Answer 0

Minimum obstruction clearance altitude:

Lowest published else today between radio fixes on VOR airways.

Meets obstacle clearance requirements.

Ensure acceptable navigation signal coverage only within 25 statute/22 nautical miles of your

Question 1

Define MEA:

Answer 1

Minimum enroute altitude:

Lowest publish altitude between radio fixes.

Ensures acceptable navigation signal coverage.

Meets obstacle clearance requirements

Question 2

Define MCA:

Answer 2

Minimum crossing altitude:

Lowest altitude at certain fixes,

must cross when proceeding in the direction of higher MEA.

Question 3

Define MRA:

Answer 3

Minimum reception altitude:

Lowest altitude at which intersection to be determined

Question 4

Define MAA:

Answer 4

Maximum authorized altitude:

Maximum usable altitude ensure adequate reception of nav aid signal.

Question 5

Define OROCA:

Answer 5

Off routes obstruction clearance altitude:

Construction clearance with 1,000 ft buffer: non-mountainous terrain.
2,000 ft buffer: in designated mountainous area.

Question 6

If no altitude prescribed, what minimum altitudes apply for IFR?

Answer 6

Mountainous terrain:
At least 2,000 feet above the highest obstacle.
Non-mountainous terrain:
At least 1,000 feet above the highest obstacle.
Within horizontal distance of four nautical miles flown.

Question 7

What cruising altitude be maintained in controlled airspace?

Answer 7

0° to 179° = odd thousands MSL

180° to 359° = even thousand MSL