MEF-Natural Terrain Feature or Natural Vertical Obstacle

Question 1

When a natural terrain feature or natural vertical obstacle (e.g. a tree) is the highest feature within the quadrangle:

Answer 1

MEF natural terrain

Question 2

MEF Naturcal Terrain Step 1
1. Determine the (elevation, slope) of the feature.

Answer 2

elevation

Question 3

MEF Natural Terrain step 2:
Add the possible (horizontal error, vertical error) of the source to the above figure ((100’, 500’) or 1/2 the contour interval when interval on
source exceeds 200’).

Answer 3

vertical error; 100’

Question 4

MEF Natural Terrain 3.
Add a (200’, 300’) allowance for uncharted natural or manmade obstacles. Chart specifications don’t
require the portrayal of obstacles below (minimum, maximum) height.

Answer 4

200’; minimum

Question 5

MEF Natural Terrain step 4.
Round the figure up to the next higher (hundred-foot, thousand-foot) level.

Answer 5

hundred-foot

Question 6

Elevation of obstacle top (MSL): 13161

Possible vertical error: +100

Obstacle Allowance: +200

equals: 13461

Raise to the following 100’ level: 13500

Maximum Elevation Figure (MEF): ?

Answer 6

13^5 or 13,5

Question 7

Pilots should be aware that while the MEF is based on the best information available to the Specialist, the figures are (verified ,not verified) by field surveys.

Answer 7

not verified