MORA, MOCA, SH

Question 1

What is the Definition of a MOCA

Answer 1

Minimum obstruction clearance altitude

It is the lowest published altitude in effect between:

• radio fixes on VOR airways
• off airway routes
• route segments which meet obstacle clearance requirements for entire segment

Question 2

What are the requirements of a MOCA

Answer 2

the maximum terrain or obstacle elevation + 1000ft up to 5000ft. ( + 2000ft for above 5000ft).

Question 3

Where is MOCA in relation to other altitudes

Answer 3

always at or below MEA (minimum enroute altitude)

could be below MRA so it’s only used in emergencies

Question 4

What is Safety Height and it’s requirements

Answer 4

A terrain clearance based on the Minimum Off-Route Altitude.

• 1000ft clearance above terrain up to 5000ft AMSL
• 2000ft clearance above terrain above 5001ft AMSL

Question 5

What is the size of the Safety Height consideration

Answer 5

• an area 50nm either side of track

- an area 50nm semi circular around the end of each sector

Question 6

What is a MORA

Answer 6

Minimum off-route altitude

Question 7

What is a Route MORA and it’s requirements

Answer 7

Provides an obstacle clearance of:

• 10nm either side of airway
• 10nm radius around ends of the airway
• 1000ft clearance above terrain, 2000ft clearance above mountainous terrain

Question 8

What is a Grid MORA and it’s requirements

Answer 8

Provides an obstacle clearance in a latitude/longitude block (usually 1 degree by 1 degree)

• 1000ft clearance where terrain is 5000ft MSL or lower
• 2000ft clearance where terrain is 5001ft MSL or higher.