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Air carrier dispatcher reported the MEL restriction for a single GPS inoperative does not accurately describe the flight planning restrictions.
| Attributes | |
| ACN | 1579665 |
| Time | |
| Date | 201809 |
| Aircraft 1 | |
| Make Model Name | Airbus Industrie Undifferentiated or Other Model |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPS & Other Satellite Navigation |
| Person 1 | |
| Function | Dispatcher |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural MEL |
Narrative:
I am concerned that placard xxxxx does not accurately describe the flight planning restrictions associated with a single GPS inoperative on the airbus. It appears to me that neither RNAV (GPS) nor RNAV (rnp) approaches may be conducted in this condition; but the placard only prohibits RNAV (rnp) approaches (which are not authorized on the airbus fleet anyway). I discovered this discrepancy prior to the point of dispatch; and my flight is dispatched safely and legally.per the flight manual 'RNAV (GPS) and RNAV (rnp) approach procedures require wgs-84 coordinates and GPS primary.';per the flight manual 'GPS primary requires the following: (2) operational fmgcs; (2) operational GPS systems; and GPS primary displayed on both mcdus on prog page.'per these guidelines; we do not have GPS primary due to only (1) operational GPS system. Since we don't have GPS primary; we can no longer conduct RNAV (GPS) nor RNAV (rnp) approaches. This is further supported in the ICAO 2012 qrg which states 'RNAV (GPS) approaches require both GPS'.this is a safety concern due to the fact that without doing the additional research a flight could be unsafely and illegally dispatched to a station based on an RNAV (GPS) approach. Alternatively; if the placard is correct and RNAV (GPS) approaches may still be conducted; then the flight manual and ICAO 2012 qrg references should be clarified in order to prevent further confusion.
Original NASA ASRS Text
Title: Air carrier Dispatcher reported the MEL restriction for a single GPS inoperative does not accurately describe the flight planning restrictions.
Narrative: I am concerned that Placard XXXXX does not accurately describe the flight planning restrictions associated with a single GPS inoperative on the Airbus. It appears to me that neither RNAV (GPS) nor RNAV (RNP) approaches may be conducted in this condition; but the placard only prohibits RNAV (RNP) approaches (which are not authorized on the Airbus fleet anyway). I discovered this discrepancy prior to the point of dispatch; and my flight is dispatched safely and legally.Per the Flight Manual 'RNAV (GPS) and RNAV (RNP) approach procedures require WGS-84 coordinates and GPS PRIMARY.';Per the Flight Manual 'GPS PRIMARY requires the following: (2) operational FMGCs; (2) operational GPS systems; and GPS PRIMARY displayed on both MCDUs on PROG page.'Per these guidelines; we do not have GPS primary due to only (1) operational GPS system. Since we don't have GPS primary; we can no longer conduct RNAV (GPS) nor RNAV (RNP) approaches. This is further supported in the ICAO 2012 QRG which states 'RNAV (GPS) approaches require both GPS'.This is a safety concern due to the fact that without doing the additional research a flight could be unsafely and illegally dispatched to a station based on an RNAV (GPS) approach. Alternatively; if the placard is correct and RNAV (GPS) approaches may still be conducted; then the Flight Manual and ICAO 2012 QRG references should be clarified in order to prevent further confusion.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.