Index   352 -- Page 353 -- 354

11/10/16
12/10/15                                                                                                   AIM



  f. Circling. Circling minimums charted on an            lots may safely perform the circling maneuver at the
RNAV (GPS) approach chart may be lower than the           circling published line of minima if the approach and
LNAV/VNAV line of minima, but never lower than            circling maneuver is properly performed according to
the LNAV line of minima (straight-in approach). Pi-       aircraft category and operational limitations.

                                                 FIG 5-4-11
                     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/
                                                      1572 - 5 1264 (1300 - 5)
 VNAV          DA
                            1180 / 24            1180 / 40               1180 / 2             1180 / 2 ¼
 LNAV          MDA
                          872 (900 - ½)        872 (900 - ¾)           872 (900 - 2)        872 (900 - 2 ¼)
                            1180 - 1            1180 - 1 ¼              1180 - 2 ½            1180 - 2 ¾
     CIRCLING
                          870 (900 - 1)       870 (900 - 1 ¼)         870 (900 - 2 ½)       870 (900 - 2 ¾)

                                                 FIG 5-4-12
                 Explanation of LNAV and/or Circling Minima Lower than LNAV/VNAV DA




  g. FIG 5-4-12 provides a visual representation of       can be different than the controlling obstacle used in
an obstacle evaluation and calculation of LNAV            determining ROC for circling MDA. Other factors
MDA, Circling MDA, LNAV/VNAV DA.                          may force a number larger than 250 ft to be added to
                                                          the LNAV OCS. The number is rounded up to the next
    1. No vertical guidance (LNAV). A line is
                                                          higher 20 foot increment.
drawn horizontal at obstacle height and 250 feet
added for Required Obstacle Clearance (ROC). The              2. Circling MDA. The circling MDA will
controlling obstacle used to determine LNAV MDA           provide 300 foot obstacle clearance within the area


Arrival Procedures                                                                                      5-4-17