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RNP - PowerPoint PPT Presentation


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PPOS = Present Position. Courtesy of FlightSafety Boeing Technical Training www.fsbti.com (877)576-5713. Actual and Required Navigation Performance. RNP = Required Navigation Performance (green shaded area indicates acceptable performance) . ANP = Actual Navigation Performance.

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slide1

PPOS = Present Position

Courtesy of FlightSafetyBoeing Technical Training

www.fsbti.com

(877)576-5713

Actual and Required Navigation Performance

RNP = Required Navigation Performance (green shaded area indicates acceptable performance)

ANP = Actual Navigation Performance

In this example, outer circle radius is the RNP, which indicates MINIMUM acceptable system accuracy. In other words, the navigation system MUST be able to supply a present position with an accurate to the area INSIDE this circle.

In this example, the inner circle radius is the ANP, which indicates ACTUAL system accuracy. This means that the ACTUAL Present Position is somewhere inside this circle.

RNP

The Flight Management System calculates ANP based on:

  • Available navigation sources, such as VOR, GPS/GNS, DME and IRS. For example, if GPS is lost, ANP is significantly reduced.

ANP

x

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Push “ENTER” to Continue

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  • Geometry (distance and bearing) to navigation sources (GPS satellites, VOR or DME stations).

PPOS

A lower number for ANP indicates GOOD system accuracy. A higher number indicates REDUCED accuracy.

This example shows GOOD ANP, because the ACTUAL system accuracy is WITHIN the Required limits)

slide2

PPOS = Present Position

RNP = Required Navigation Performance (green shaded area indicates acceptable performance)

ANP = Actual Navigation Performance

Courtesy of FlightSafetyBoeing Technical Training

www.fsbti.com

(877)576-5713

Actual and Required Navigation Performance

Provided courtesy of

FlightSafetyBoeing

CLICK HERE FOR MORE INFORMATION

This example shows BAD ANP (OUTER circle), because ANP > RNP

  • ACTUAL system accuracy

ANP

NOT within Required limits

Present Position is only accurate to the within the radius of the ANP.

If ANP exceeds RNP a message of “UNABLE RNP” is usually displayed.

This does not indicate that the position is incorrect. It merely indicates that FMS cannot guarantee accuracy of Present Position within Required limits.

RNP

x

Push “ENTER” to Continue

Push “ENTER” to Continue

Push “ENTER” to Continue

PPOS

This is calculated based on quality and availability of data being used by FMS. Accuracy degradation can come from many factors (signal geometry, or failed systems, etc.)