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Inadvertent erroneous radial set for intercept on STAR. For radial of 343 degrees, flight crew set 143 degrees for the inbound vice 163 degrees. Consequently they turned inbound too soon.
| Attributes | |
| ACN | 330330 |
| Time | |
| Date | 199603 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 12000 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zob |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 8500 flight time type : 4000 |
| ASRS Report | 330330 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5800 flight time type : 210 |
| ASRS Report | 330520 |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Made premature turn on arrival. Looked at arrival and misread radial and heading. The radial was 343 degrees which we set as 143 degree heading, instead of 163 degree heading. Even though we did double check the chart, perhaps three would be the charm. Also, xchking should have been included. Supplemental information from acn 330520: I was busy with my descent and approach flows, getting the ATIS, etc. The captain at first questioned (in his mind, not verbally) my set up of the navigation radio but after consulting the arrival plate set up his radio on the wrong inbound course as well. After approximately 5 mi on the wrong course, cleveland questioned our heading. We informed him that we were on the 343 degree radial to dtw inbound (we were actually on the 323 degree radial). He quickly realized our mistake and we were given a heading of 080 degrees to intercept the correct radial inbound and an amended altitude of 15000 ft MSL. Both the captain and I are relatively new on the airplane (DC9). We were both tired after a couple of rough WX days. We both made an honest mistake of tuning in 143 degrees in the HSI (because the plate reads 343 degrees). I believe fatigue and workload were the major contributing factors in this event.
Original NASA ASRS Text
Title: INADVERTENT ERRONEOUS RADIAL SET FOR INTERCEPT ON STAR. FOR RADIAL OF 343 DEGS, FLC SET 143 DEGS FOR THE INBOUND VICE 163 DEGS. CONSEQUENTLY THEY TURNED INBOUND TOO SOON.
Narrative: MADE PREMATURE TURN ON ARR. LOOKED AT ARR AND MISREAD RADIAL AND HDG. THE RADIAL WAS 343 DEGS WHICH WE SET AS 143 DEG HDG, INSTEAD OF 163 DEG HDG. EVEN THOUGH WE DID DOUBLE CHK THE CHART, PERHAPS THREE WOULD BE THE CHARM. ALSO, XCHKING SHOULD HAVE BEEN INCLUDED. SUPPLEMENTAL INFO FROM ACN 330520: I WAS BUSY WITH MY DSCNT AND APCH FLOWS, GETTING THE ATIS, ETC. THE CAPT AT FIRST QUESTIONED (IN HIS MIND, NOT VERBALLY) MY SET UP OF THE NAV RADIO BUT AFTER CONSULTING THE ARR PLATE SET UP HIS RADIO ON THE WRONG INBOUND COURSE AS WELL. AFTER APPROX 5 MI ON THE WRONG COURSE, CLEVELAND QUESTIONED OUR HDG. WE INFORMED HIM THAT WE WERE ON THE 343 DEG RADIAL TO DTW INBOUND (WE WERE ACTUALLY ON THE 323 DEG RADIAL). HE QUICKLY REALIZED OUR MISTAKE AND WE WERE GIVEN A HDG OF 080 DEGS TO INTERCEPT THE CORRECT RADIAL INBOUND AND AN AMENDED ALT OF 15000 FT MSL. BOTH THE CAPT AND I ARE RELATIVELY NEW ON THE AIRPLANE (DC9). WE WERE BOTH TIRED AFTER A COUPLE OF ROUGH WX DAYS. WE BOTH MADE AN HONEST MISTAKE OF TUNING IN 143 DEGS IN THE HSI (BECAUSE THE PLATE READS 343 DEGS). I BELIEVE FATIGUE AND WORKLOAD WERE THE MAJOR CONTRIBUTING FACTORS IN THIS EVENT.
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.