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P50 controller concerned with recent implemented RNAV arrival procedure and observing some pilots failing to correctly fly the new procedures.
| Attributes | |
| ACN | 551932 |
| Time | |
| Date | 200206 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx.airport |
| State Reference | AZ |
| Altitude | msl bound lower : 6000 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : mahem 1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival star : mahem 1 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller limited radar : 4 controller radar : 15 controller supervisory : 1 controller time certified in position1 : 10 |
| ASRS Report | 551932 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar other controllera |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Chart Or Publication Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| Chart | star : mahem one |
Narrative:
Aircraft X and aircraft Y were operating on the mahem STAR. This is an RNAV arrival that directs the aircraft where to turn downwind. There is frequent confusion on the part of pilots whether to fly the procedure as cleared or not. Both of these aircraft failed to turn as required within 10 mins of each other. Immediate action was taken by the controller to avoid conflict. There is insufficient conformance to the procedures to allow RNAV stars in the terminal environment. Due to the frequency of deviations, a serious situation is inevitable. The implementation of RNAV procedures needs to be addressed from a safety point of view.
Original NASA ASRS Text
Title: P50 CTLR CONCERNED WITH RECENT IMPLEMENTED RNAV ARR PROC AND OBSERVING SOME PLTS FAILING TO CORRECTLY FLY THE NEW PROCS.
Narrative: ACFT X AND ACFT Y WERE OPERATING ON THE MAHEM STAR. THIS IS AN RNAV ARR THAT DIRECTS THE ACFT WHERE TO TURN DOWNWIND. THERE IS FREQUENT CONFUSION ON THE PART OF PLTS WHETHER TO FLY THE PROC AS CLRED OR NOT. BOTH OF THESE ACFT FAILED TO TURN AS REQUIRED WITHIN 10 MINS OF EACH OTHER. IMMEDIATE ACTION WAS TAKEN BY THE CTLR TO AVOID CONFLICT. THERE IS INSUFFICIENT CONFORMANCE TO THE PROCS TO ALLOW RNAV STARS IN THE TERMINAL ENVIRONMENT. DUE TO THE FREQ OF DEVIATIONS, A SERIOUS SIT IS INEVITABLE. THE IMPLEMENTATION OF RNAV PROCS NEEDS TO BE ADDRESSED FROM A SAFETY POINT OF VIEW.
Data retrieved from NASA's ASRS site as of July 2007 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.