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Departure controller cleared air carrier medium large transport to climb to occupied altitude then realized medium large transport was catching preceeding air carrier and issued new clearance to maintain separation.
| Attributes | |
| ACN | 82854 |
| Time | |
| Date | 198803 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 5000 msl bound upper : 5300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 175 flight time total : 17500 flight time type : 9000 |
| ASRS Report | 82854 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Original clearance was to maintain 5000'. Upon changing to departure control we were cleared to maintain 6000'. I read back the clearance and checked that the first officer set 6000' in the altitude alerter. As we passed through 5000', the controller instructed us to stop climb and maintain 5000'. The climb was stopped at 5300' and we returned to 5000'. The controller had also given us a turn to 340 degrees along with the climb to 6000'. He then gave us a heading of 020 degrees and asked if we had traffic in sight approximately 12 O'clock at 6000'. We reported traffic in sight and were cleared to maintain visual sep, climb to 15000' and then to 280 degrees for spacing. It appears that the departure controller erred when he assigned us 3000'. There is no doubt in the minds of both cockpit crew members that we were assigned to maintain 6000'.
Original NASA ASRS Text
Title: DEP CTLR CLEARED ACR MLG TO CLIMB TO OCCUPIED ALT THEN REALIZED MLG WAS CATCHING PRECEEDING ACR AND ISSUED NEW CLRNC TO MAINTAIN SEPARATION.
Narrative: ORIGINAL CLRNC WAS TO MAINTAIN 5000'. UPON CHANGING TO DEP CTL WE WERE CLRED TO MAINTAIN 6000'. I READ BACK THE CLRNC AND CHKED THAT THE F/O SET 6000' IN THE ALT ALERTER. AS WE PASSED THROUGH 5000', THE CTLR INSTRUCTED US TO STOP CLB AND MAINTAIN 5000'. THE CLB WAS STOPPED AT 5300' AND WE RETURNED TO 5000'. THE CTLR HAD ALSO GIVEN US A TURN TO 340 DEGS ALONG WITH THE CLB TO 6000'. HE THEN GAVE US A HDG OF 020 DEGS AND ASKED IF WE HAD TFC IN SIGHT APPROX 12 O'CLOCK AT 6000'. WE RPTED TFC IN SIGHT AND WERE CLRED TO MAINTAIN VISUAL SEP, CLB TO 15000' AND THEN TO 280 DEGS FOR SPACING. IT APPEARS THAT THE DEP CTLR ERRED WHEN HE ASSIGNED US 3000'. THERE IS NO DOUBT IN THE MINDS OF BOTH COCKPIT CREW MEMBERS THAT WE WERE ASSIGNED TO MAINTAIN 6000'.
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.