Mission Planning 03-55

Question 1

What is defined as mountainous terrain?

Answer 1

a) Terrain in assessment area exceeds 15000 ft AMSL
b) Designated at mountainous terrain
c) National airpsace authority requires the use of a 200 ft clearance margin for Safety height calcs (e.g. as in PNG)
d) Crew doubts topographical maps

Question 2

What terrain clearance margin should be applied to LSALT and airfield MSA in mountainous terrain?

Answer 2

2000ft AO

Question 3

How is ASH calculated?

Answer 3

• Assessing the highest terran and obstacles in an rea within 55nm of the planned track.
• Highest of the following:
  a) 1500 ft AMSL
  b) 1000ft above highest obstacle within the area where the obstacle is more than 360ft above highst terrain
  c) 1360 ft above highest obstacle withi the area where obstacle is < 360 ft above the highest terrain.