Non-precision Approaches

Gulfstream GVII

Eddie sez:

Flying a non-precision approach in the GVII is pretty easy, but setting it up correctly can be a challenge. Let's see if we can demystify the process.

Everything here is from the references shown below, with a few comments in an alternate color.

  • The Localizer Question — The first question you need to answer is whether the approach is localizer based or not; it makes a difference on how you program and fly.
  • Guidance Panel — How you get from up (the final approach fix altitude) to down (the MDA/DA/DDA) isn't as complicated as it used to be, but there are two choices to be made and they aren't the same as in your last Gulfstream.
  • Minimums — How low can you go before you see something? That depends on the type of approach, your EVS, and the authorizations you have.

Last revision:

20191031

The Localizer Question

This FMS cannot fly what used to be called an "overlay" with a localizer based approach, it cannot be done. So you need to know that if you are flying an ILS, LOC, LDA, SDF, or LOC BC approach, you have not choice but to fly that thing in short range (green) data. This also means you cannot use VNAV. Yes, that is possible with some FMS, but not this one. Any other approach, so long as it is in a WGS-84 environment, can be flown in blue data.

Guidance Panel

You will manipulate the guidance panel to get to the final approach fix and again to get to the Minimum Descent Altitude / Derived Descent Altitude (MDA/DDA), and perhaps again for the Missed Approach Altitude (MAA).

  • LOC, LDA (Green data)
    • Lateral: LNAV to FAF then LOC (LOC will be annunciated)
    • Vertical: FPA or VS
    • ASEL: MDA until the missed approach point then MAA if a missed approach is executed, OR
      DDA until VPATH captured then MAA
  • BC (Green data)
    • Lateral: LNAV (BC will be annunciated)
    • Vertical: FPA or VS
    • ASEL: MDA until the missed approach point then MAA if a missed approach is executed, OR
      DDA until VPATH captured then MAA
  • VOR (Green data)
    • Lateral: LNAV to FAF then APR (VORAP will be annunicated if APR pressed)
    • Vertical: FPA or VS
    • ASEL: MDA until the missed approach point then MAA if a missed approach is executed, OR
      DDA until VPATH captured then MAA
  • NDB (Green data)
    • Lateral: HDG (HDG will be annunicated)
    • Vertical: FPA or VS
    • ASEL: MDA until the missed approach point then MAA if a missed approach is executed, OR
      DDA until VPATH captured then MAA
  • VOR, NDB, or RNAV (Blue data)
    • Lateral: LNAV to FAF then APR (FMS will be annunicated)
    • Vertical: FPA or VS until FAF then APR (VPATH or VGP will be annunicated)
    • ASEL: MDA until the missed approach point then MAA if a missed approach is executed, OR
      DDA until VPATH captured then MAA
  • LPV (Blue data)
    • Lateral: LNAV to FAF then APR (LPV will be annunicated)
    • Vertical: FPA or VS until FAF then APR (VPATH or VGP will be annunicated)
    • ASEL: MAA (put DA in TSC Baro Alt)

The guidance panel defaults to Flight Path Angle, you can select Vertical Speed instead.

Select the MDA for a circling approach or a straight-in if not flying a Continuous Descent Final Approach where a DDA is called for. If no DDA is given, it can be computed in the GVII by adding 50 feet (maximum autopilot altitude loss) to MDA.

Minimums

On the "Apr Mins" tab of the "Perf Landing" page you will see a button for Minimums Type. There is a three position radio button where you select Off, Baro, and Rad Alt. Enter your DA, MDA, or DDA in the Baro selection and if you plan on an EVS approach, enter 100 in the Rad Alt. This will give you the "Minimums" call at the DA, MDA, or DDA and the "Secondary" call at 100 feet radio altimeter height.


Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019

Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019