AIM

8/15/19

5

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4

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54

Arrival Procedures

FIG 5

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4

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30

Standard and Expanded Circling Approach Radii in the U.S. TPP

2. Precision Obstacle Free Zone (POFZ).

A

volume of airspace above an area beginning at the
runway threshold, at the threshold elevation, and
centered on the extended runway centerline. The
POFZ is 200 feet (60m) long and 800 feet (240m)
wide. The POFZ must be clear when an aircraft on a
vertically guided final approach is within 2 nautical
miles of the runway threshold and the official weather
observation is a ceiling below 250 feet or visibility
less than 

3

/

4

 statute mile (SM) (or runway visual range

below 4,000 feet). If the POFZ is not clear, the
MINIMUM authorized height above touchdown
(HAT) and visibility is 250 feet and 

3

/

4 

SM. The POFZ

is considered clear even if the wing of the aircraft
holding on a taxiway waiting for runway clearance
penetrates the POFZ; however, neither the fuselage
nor the tail may infringe on the POFZ. The POFZ is
applicable at all runway ends including displaced
thresholds.

FIG 5

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4

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31

Precision Obstacle Free Zone (POFZ)