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T-6A INSTRUMENT NAVIGATION
CHAPTER EIGHT
NOTE
The GPS system will not automatically sequence to any waypoints
required to execute the missed approach procedure. Automatic
sequencing will cease at the MAP. If a missed approach is
required, the pilot must manually sequence the system to the
MAWP. Press the "DIRECT TO" key followed by the "ENTER"
key, the default WPT will be the MAWP defined in the procedure.
APPROACHES WITH PROCEDURE TURNS
If a procedure turn is required prior to executing the final approach segment, the pilot must
consider whether the approach has a co-located IAF and FAF or not. If an approach has a co-
located IAF/FAF and requires a course reversal (procedure turn), then OBS mode must be
selected prior to executing the outbound leg. Selecting OBS mode disables automatic waypoint
sequencing and allows the inbound course to be dialed into the CDI so it can be intercepted on
the procedure turn inbound. If the aircrew does not select the OBS mode, the GPS will
automatically sequence to the MAWP at the co-located IAF/FAF. On the procedure turn
outbound, make sure the IAF/FAF is still the active waypoint, dial the inbound course into the
CDI, and complete the procedure turn. Once established on the inbound course, select LEG
mode to enable automatic waypoint sequencing. When the IAF and FAF are the same waypoint,
the FAF is automatically made the active waypoint when LEG mode is selected. Be sure to
allow sufficient distance to have a minimum of 2 NM to the FAF prior to selecting LEG mode so
the GPS will transition to the ACTIVE mode when conditions permit.
For procedure turn approaches where the IAF and FAF are not co-located, the IAF must be
overflown to allow the GPS to sequence to the FAF automatically. In this case, if OBS is
selected prior to the IAF, then automatic waypoint sequencing would be disabled and the FAF
would have to be manually selected as the active waypoint. Therefore, only select the OBS
mode once past the IAF instead of just prior to it. Complete the procedure turn outbound in OBS
mode, confirm the FAF is the active waypoint, and dial the inbound course into the CDI. As
before, select LEG mode at a minimum distance of 2 NM from the FAF once established on
final.
In the case that a NoPT route segment is flown, it must be done in LEG mode. OBS mode is not
required for NoPT routings. There are no course reversals in this instance so there is no need to
interrupt auto sequencing. The IAF must, however, be overflown so the FAF sequences
automatically to the active waypoint. Once established on a final course to the FAF, the
approach procedures remain the same as in RVFAC.
ARCING APPROACHES
Arc procedures will only be encountered with overlay approaches, but it must be noted that DME
arc procedures flown with the GPS are significantly different than traditional VOR/TACAN
arcing approaches. DME arc approaches are flown in the LEG mode. Selecting an approach
GLOBAL POSITIONING SYSTEM
8-11


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