MRA and MORA

Question 1

How is grid MORA calculated

Answer 1

Provides clearance from terrain for 1° of LAT/LONG

0-5000ft by 1500ft
+5000ft by 2000ft

No wind correction included

Question 2

What is MRA

How is it calculated

What terrain clearance

Answer 2

• MRA is CX figure used on CFP
• uses highest grid MORA 10nm from track
• increased by 1000ft
• includes wind up to 30kt

-total clearance;
0-5000ft - 2,500ft
+5000ft - 3,000ft

Question 3

Wind corrections

Navtech charts

Answer 3

Navtech chart wind corrections

                    0-30    31-50  51-70   70+ 2-8000ft.  +500.   1000.   1500.   2000 8000+ft.    +1000.  1500.   2000.  2500

Question 4

Wind corrections

CFP MRA

Answer 4

CFP MRA wind corrections

For 2000ft +

0-30 31-50 51-70 70+
Incl. +500. 1000. 1500

Question 5

Wind corrections

Enroute Diversion Guide

Answer 5

Wind corrections EDG

0-50 51-70 71+
incl. +500. 1000

Question 6

Enroute diversion guide clearance calculation

Answer 6

• uses CFP MRA and adjusts for safety
• uses highest grid MORA within 10nm of track or 20nm if off a published airway

Elev. 0-5000 5001-8000 Abv 8000
Clearance. 2500. 3000. 3500