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RNAV Arrivals

Jun 30, 2017
By: Stacy Honda, Marketing Manager

Flying an RNAV Arrival with FMS SCN 60X Series Software

Arrival procedures with the "Descend Via" clearance is a hot topic in the FMS Software Version 60X world. FMS with 80X and 100X series software fly these procedures nicely, but with 60X it takes a bit of knowledge. The following information helps to cover this:

The "Descend Via the PUFFR4 RNAV ARRIVAL" clearance requires the pilot to fly the arrival both laterally and vertically, and comply with speed restrictions.


Flying an RNAV Arrival

These types of arrivals can be flown with the Vertical Navigation (VNAV) of Universal Avionics FMS with the Software Version 60X series, but the pilot must enter crossing altitudes manually. The 60X series FMS will not automatically calculate crossing altitudes as does later generation software. At or above, at or below, or between altitudes must be calculated and entered by the pilot. While the pilot must comply with speed restrictions, the FMS will fly the arrival both laterally and vertically.


Review the Flight Plan

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When reviewing the flight plan page after loading the PUFFR FOUR ARRIVAL, you'll see both the waypoints and their associated altitude information in the ALT/FL field (Software Version 603 and 604 shows the ALT/FL field).

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Where there is a crossing window, at or above, between, or at or below, Software Version 603 and 604 will show arrows. Arrows are information only and cannot be used for vertical navigation. These must be replaced with a manually entered crossing altitude.

At (@) altitudes can be used by the FMS for vertical navigation and do not need to be replaced. For Software Version 601 and 602, all vertical inputs must be made from the VNAV page and crossing windows will not be shown.

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An "@" symbol adjacent to an ALT/FL indicates a mandatory crossing altitude.

Where dash lines are shown there are no required crossing altitudes.

If ATC assigns crossing altitudes they can be entered through the flight plan or VNAV pages.

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The end of an arrival will frequently have a different waypoint than the beginning of the approach transition. Some RNAV arrivals end at the final approach capture fix (FACF) waypoint, therefore an approach transition is not necessary. Because the approach label is not the same as the arrival end waypoint, the FMS will enter a "*NO LINK*" prior to the approach label.

Edit the Flight Plan

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Editing the flight plan to attain continuity will insure the STAR and the approach have a smooth transition.

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PUFFR intersection has no charted altitude, but if ATC assigns a crossing altitude, it can be entered in the ALT/FL field or on the VNAV page. To enter a flight level, three number can be used and when E is pressed…

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…the flight level will be entered.

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Where crossing altitude windows are presented the pilot must replace them manually with an @ altitude.

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Press the adjacent line select key, calculate the desired crossing altitude, and make the entry.

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The same procedure applies to a between altitude window.

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By manually replacing the altitude windows with an @ altitude, a vertical profile is created.

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Where crossing altitude windows are presented the pilot must replace them manually with an @ altitude.

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Press the adjacent line select key, calculate the desired crossing altitude, and make the entry.

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The same procedure applies to a between altitude window.

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By manually replacing the altitude windows with an @ altitude, a vertical profile is created.

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A TOD is created to PUFFR to cross at FL240 and the mileage to the Top of Descent is calculated.

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If the aircraft MFD is capable of showing the TOD it will be presented.

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Two minutes prior to the TOD the FMS will push a "TOP OF DESCENT ALERT" message. At this time the aircrew will need to coordinate their descent with ATC.

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Upon capture the VNAV page information will change from distance to the TOD to vertical deviation (VDEV). This is deviation from the calculated vertical flightpath.

Monitor the Arrival

 
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Monitoring the arrival can now be done on the FMS NAV page, primary flight display, and the multifunction display.

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Additional Information
For more information, please contact our Support team.

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