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Medium large transport flight crew given wrong departure frequency and misunderstood heading for vector.
| Attributes | |
| ACN | 145869 |
| Time | |
| Date | 199005 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mdw |
| State Reference | IL |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mdw tower : cgx |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 6500 |
| ASRS Report | 145869 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 210 flight time total : 11700 |
| ASRS Report | 145868 |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
Mdw tower controller cleared us for takeoff and directed we turn '2-9-0' after takeoff. After takeoff we switched to the assigned departure frequency and after SID restrictions, turned to a heading of 290 degrees. After no response on the assigned departure frequency, we returned to tower and the controller then assigned the correct departure frequency and directed us to 'turn right to 0-9-0 heading.' we immediately turned right to 090 degrees and continued the flight west/O further event. The problem was twofold. First, it appears the controller originally intended us to fly a heading of 090 degrees after takeoff. His working of turn 'to-9-0' was misleading. Although we read back, 'cleared for takeoff heading 290 degrees,' he missed his error. Secondly, the incorrectly assigned departure frequency delayed the correction of the heading assignment error. In any event, no incident occurred and an uneventful flight was continued.
Original NASA ASRS Text
Title: MLG FLT CREW GIVEN WRONG DEP FREQ AND MISUNDERSTOOD HEADING FOR VECTOR.
Narrative: MDW TWR CTLR CLRED US FOR TKOF AND DIRECTED WE TURN '2-9-0' AFTER TKOF. AFTER TKOF WE SWITCHED TO THE ASSIGNED DEP FREQ AND AFTER SID RESTRICTIONS, TURNED TO A HDG OF 290 DEGS. AFTER NO RESPONSE ON THE ASSIGNED DEP FREQ, WE RETURNED TO TWR AND THE CTLR THEN ASSIGNED THE CORRECT DEP FREQ AND DIRECTED US TO 'TURN RIGHT TO 0-9-0 HDG.' WE IMMEDIATELY TURNED RIGHT TO 090 DEGS AND CONTINUED THE FLT W/O FURTHER EVENT. THE PROB WAS TWOFOLD. FIRST, IT APPEARS THE CTLR ORIGINALLY INTENDED US TO FLY A HDG OF 090 DEGS AFTER TKOF. HIS WORKING OF TURN 'TO-9-0' WAS MISLEADING. ALTHOUGH WE READ BACK, 'CLRED FOR TKOF HDG 290 DEGS,' HE MISSED HIS ERROR. SECONDLY, THE INCORRECTLY ASSIGNED DEP FREQ DELAYED THE CORRECTION OF THE HDG ASSIGNMENT ERROR. IN ANY EVENT, NO INCIDENT OCCURRED AND AN UNEVENTFUL FLT WAS CONTINUED.
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.