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Air carrier widebody transport altitude deviation overshot during descend resulting in less than standard separation.
| Attributes | |
| ACN | 113357 |
| Time | |
| Date | 198906 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bdf |
| State Reference | IL |
| Altitude | msl bound lower : 34000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : j105 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 17000 flight time type : 1000 |
| ASRS Report | 113357 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 4400 flight time type : 500 |
| ASRS Report | 113254 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : required legal separation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 25200 vertical : 1200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was listening to ord ATIS when ATC issued a descent clearance. The first officer was working the radio and responded to center. He understood and thinks he read back a descent to FL330. FL330 was inserted in the altitude control and the descent was started from FL410. At approximately FL340 ATC called to check our altitude. We were told we had only been cleared to FL350 and given a heading and climb back to FL350. We were informed by phone by kansas city center that we had been within 4.2 mi and 1200' of another carrier at FL330. In my mind, the major contributing factor in our confusion, was my listening to ord ATIS over the cockpit speaker. It was too loud and distracted the first officer during the communication with ATC.
Original NASA ASRS Text
Title: ACR WDB ALT DEVIATION OVERSHOT DURING DESCEND RESULTING IN LESS THAN STANDARD SEPARATION.
Narrative: I WAS LISTENING TO ORD ATIS WHEN ATC ISSUED A DSCNT CLRNC. THE F/O WAS WORKING THE RADIO AND RESPONDED TO CENTER. HE UNDERSTOOD AND THINKS HE READ BACK A DSCNT TO FL330. FL330 WAS INSERTED IN THE ALT CONTROL AND THE DSCNT WAS STARTED FROM FL410. AT APPROX FL340 ATC CALLED TO CHECK OUR ALT. WE WERE TOLD WE HAD ONLY BEEN CLRED TO FL350 AND GIVEN A HDG AND CLIMB BACK TO FL350. WE WERE INFORMED BY PHONE BY KANSAS CITY CENTER THAT WE HAD BEEN WITHIN 4.2 MI AND 1200' OF ANOTHER CARRIER AT FL330. IN MY MIND, THE MAJOR CONTRIBUTING FACTOR IN OUR CONFUSION, WAS MY LISTENING TO ORD ATIS OVER THE COCKPIT SPEAKER. IT WAS TOO LOUD AND DISTRACTED THE F/O DURING THE COM WITH ATC.
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.