AIM

8/15/19

5

−

4

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18

Arrival Procedures

f. Circling. 

Circling minimums charted on an

RNAV (GPS) approach chart may be lower than the
LNAV/VNAV line of minima, but never lower than
the LNAV line of minima (straight-in approach).
Pilots may safely perform the circling maneuver at

the circling published line of minima if the approach
and circling maneuver is properly performed
according to aircraft category and operational
limitations.

FIG 5

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4

−

12

Example of LNAV and Circling Minima Lower Than LNAV/VNAV DA.

Harrisburgh International RNAV (GPS) RWY 13

CATEGORY

A

B

C

D

LPV                  DA

558/24  

 250 (300 

−

 

½

)

LNAV/
VNAV               DA

1572 

−

 5   

1264 (1300 

−

 5)

LNAV               MDA

1180 / 24

872 (900 

−

 

½

)

1180 / 40

872 (900 

−

 

¾

)

1180 / 2

872 (900 

−

 2)

1180 / 2 

¼

872 (900 

−

 2 

¼

)

CIRCLING

1180 

−

 1

870 (900 

−

 1)

1180 

−

 1 

¼

870 (900 

−

 1 

¼

)

1180 

−

 2 

½

870 (900 

−

 2 

½

)

1180 

−

 2 

¾

870 (900 

−

 2 

¾

)

FIG 5

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4

−

13

Explanation of LNAV and/or Circling Minima Lower than LNAV/VNAV DA

g.

FIG 5

−

4

−

13 provides a visual representation of

an obstacle evaluation and calculation of LNAV
MDA, Circling MDA, LNAV/VNAV DA.

1. No vertical guidance (LNAV).

 A line is

drawn horizontal at obstacle height and 250 feet
added for Required Obstacle Clearance (ROC). The

controlling obstacle used to determine LNAV MDA
can be different than the controlling obstacle used in
determining ROC for circling MDA. Other factors
may force a number larger than 250 ft to be added to
the LNAV OCS. The number is rounded up to the next
higher 20 foot increment.