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AIM

10/12/17

5−4−18

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 5−4−12

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 5−4−13

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.

3/15/07

7110.65R CHG 2

AIM

2/28/19