Quantcast GPS Procedure Turn

 

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T-34C INSTRUMENTS
CHAPTER SEVEN
NOTE
If the MAHP is the NAVAID and is also the IAF/FAF, it is
recommended to comply with the MAP and then go Direct to the
MAHP once the aircraft is headed towards the WPT. If you go
Direct to soon and the aircraft is near the NAVAID it may cycle
between the IAF/FAF and not provide guidance to the MAHP.
9.
GPS PROCEDURE TURN
If a procedure turn is required prior to executing the final approach segment the pilot must
consider whether the approach has a co-located initial and final approach fix (IAF/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 just 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 that it
can be intercepted on the procedure turn inbound. If the pilot 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 ensure 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 3 NM to the FAF prior to selecting LEG mode so that
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 over-
flown 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 3NM from the FAF once established on final.
In the case that a no procedure turn (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's no need to interrupt auto-sequencing. The IAF must, however, be over-flown so that 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.
10.
GPS Procedure-Turn Procedures
a.
Select and load desired approach into the active flight plan. (APT 8 page, right side)
b.
Select cockpit navigation source to GPS.
c.
Tune and ID all available ground based NAVAIDS for back up.
NOTE
INSTRUMENT NAVIGATION 7-39


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