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Air carrier deviation from published SID and was vectored back on track. Reporter claims NDB not accurate enough for precise navigation.
| Attributes | |
| ACN | 97490 |
| Time | |
| Date | 198811 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx tower : phx |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 15000 |
| ASRS Report | 97490 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 70 flight time total : 6500 flight time type : 110 |
| ASRS Report | 97667 |
| Events | |
| Anomaly | non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flight was departing phx on a stanfield 1 hi departure. ADF was tuned to the rsz NDB. Copilot was flying the aircraft. Aircraft was proceeding towards the rsz NDB when ADF needle indicated approaching passage of the rsz NDB. A right turn was started to intercept the salt river 168 degree right. Shortly thereafter phx departure indicated we had turned early and requested we turn back left to a 120 degree heading. They also advised us of traffic which we had in sight. I discussed the incident with a phx departure supervisor by phone about 2 hours later. If this is a critical turning point on this departure, then a more precise method of determining this point should be established. A nondirectional beacon can be very inaccurate under certain conditions, and under a departure workload cruise more error than acceptable for a precise departure. Any malfunction in ADF equipment is also not as readily ascertained as in some other equipment.
Original NASA ASRS Text
Title: ACR DEV FROM PUBLISHED SID AND WAS VECTORED BACK ON TRACK. REPORTER CLAIMS NDB NOT ACCURATE ENOUGH FOR PRECISE NAVIGATION.
Narrative: FLT WAS DEPARTING PHX ON A STANFIELD 1 HI DEP. ADF WAS TUNED TO THE RSZ NDB. COPLT WAS FLYING THE ACFT. ACFT WAS PROCEEDING TOWARDS THE RSZ NDB WHEN ADF NEEDLE INDICATED APCHING PASSAGE OF THE RSZ NDB. A RIGHT TURN WAS STARTED TO INTERCEPT THE SALT RIVER 168 DEG R. SHORTLY THEREAFTER PHX DEP INDICATED WE HAD TURNED EARLY AND REQUESTED WE TURN BACK LEFT TO A 120 DEG HDG. THEY ALSO ADVISED US OF TFC WHICH WE HAD IN SIGHT. I DISCUSSED THE INCIDENT WITH A PHX DEP SUPVR BY PHONE ABOUT 2 HRS LATER. IF THIS IS A CRITICAL TURNING POINT ON THIS DEP, THEN A MORE PRECISE METHOD OF DETERMINING THIS POINT SHOULD BE ESTABLISHED. A NONDIRECTIONAL BEACON CAN BE VERY INACCURATE UNDER CERTAIN CONDITIONS, AND UNDER A DEP WORKLOAD CRUISE MORE ERROR THAN ACCEPTABLE FOR A PRECISE DEP. ANY MALFUNCTION IN ADF EQUIP IS ALSO NOT AS READILY ASCERTAINED AS IN SOME OTHER EQUIP.
Data retrieved from NASA's ASRS site as of August 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.