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B737-400 flight crew misunderstood departure controller requested heading change resulting in rolling out on the wrong heading.
| Attributes | |
| ACN | 562795 |
| Time | |
| Date | 200210 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bwi.airport |
| State Reference | MD |
| Altitude | msl bound lower : 8000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : bwi.tracon tower : ash.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : vacating altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 16000 flight time type : 1500 |
| ASRS Report | 562795 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Cleared to 9000 ft, when a few seconds later, given 'level 8000 ft, turn right to 330 degrees.' we were passing 8200 ft turning and then given 9000 ft, again, and rollout on 270 degrees. They said we were given 330 degrees, but read back 230 degrees. I read back 230 degrees, which was close to on course. 330 degrees was opposite direction. If they needed a 90 degree different heading, I do not know why they didn't correct us sooner. Did they just guess we read back 230 degrees? In any case, 230 and 330 degrees sound alike. I read back 230 degrees and was not corrected. You can only do as instructed. If 330 degrees was needed it should have been noticed and corrected much sooner.
Original NASA ASRS Text
Title: B737-400 FLC MISUNDERSTOOD DEP CTLR REQUESTED HDG CHANGE RESULTING IN ROLLING OUT ON THE WRONG HDG.
Narrative: CLRED TO 9000 FT, WHEN A FEW SECONDS LATER, GIVEN 'LEVEL 8000 FT, TURN R TO 330 DEGS.' WE WERE PASSING 8200 FT TURNING AND THEN GIVEN 9000 FT, AGAIN, AND ROLLOUT ON 270 DEGS. THEY SAID WE WERE GIVEN 330 DEGS, BUT READ BACK 230 DEGS. I READ BACK 230 DEGS, WHICH WAS CLOSE TO ON COURSE. 330 DEGS WAS OPPOSITE DIRECTION. IF THEY NEEDED A 90 DEG DIFFERENT HDG, I DO NOT KNOW WHY THEY DIDN'T CORRECT US SOONER. DID THEY JUST GUESS WE READ BACK 230 DEGS? IN ANY CASE, 230 AND 330 DEGS SOUND ALIKE. I READ BACK 230 DEGS AND WAS NOT CORRECTED. YOU CAN ONLY DO AS INSTRUCTED. IF 330 DEGS WAS NEEDED IT SHOULD HAVE BEEN NOTICED AND CORRECTED MUCH SOONER.
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.