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Less than standard separation between air carrier medium large transport on descent and air carrier widebody transport in cruise deviating around thunderstorm activity.
| Attributes | |
| ACN | 179528 |
| Time | |
| Date | 199105 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pxv |
| State Reference | IN |
| Altitude | msl bound lower : 26000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 18720 |
| ASRS Report | 179528 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 |
| ASRS Report | 179641 |
| Events | |
| Anomaly | aircraft equipment problem : less severe conflict : airborne less severe non adherence : required legal separation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 3000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was the first officer on this flight. I had to go to the restroom. When I came back to the cockpit, the captain was descending to FL240 from FL280. Center called us to turn left 50 degrees and another aircraft was at FL260, to turn left 50 degrees. I saw this aircraft to my right, above, 4-5 mi. It was white with a dark tail--I think a widebody transport cargo. The captain never told me his CDI needle was stuck to the full left, and I think he was off course some. So he had turned back to the right to get on course. Other aircraft were deviating because of thunderstorms. The captain had me write up the CDI in the aircraft log book. When the aircraft passed the VOR, the CDI stayed to the left of the course. ATC advised us we had almost had a problem out there.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN ACR MLG ON DESCENT AND ACR WDB IN CRUISE DEVIATING AROUND TSTM ACTIVITY.
Narrative: I WAS THE F/O ON THIS FLT. I HAD TO GO TO THE RESTROOM. WHEN I CAME BACK TO THE COCKPIT, THE CAPT WAS DSNDING TO FL240 FROM FL280. CENTER CALLED US TO TURN LEFT 50 DEGS AND ANOTHER ACFT WAS AT FL260, TO TURN LEFT 50 DEGS. I SAW THIS ACFT TO MY RIGHT, ABOVE, 4-5 MI. IT WAS WHITE WITH A DARK TAIL--I THINK A WDB CARGO. THE CAPT NEVER TOLD ME HIS CDI NEEDLE WAS STUCK TO THE FULL LEFT, AND I THINK HE WAS OFF COURSE SOME. SO HE HAD TURNED BACK TO THE RIGHT TO GET ON COURSE. OTHER ACFT WERE DEVIATING BECAUSE OF TSTMS. THE CAPT HAD ME WRITE UP THE CDI IN THE ACFT LOG BOOK. WHEN THE ACFT PASSED THE VOR, THE CDI STAYED TO THE LEFT OF THE COURSE. ATC ADVISED US WE HAD ALMOST HAD A PROB OUT THERE.
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.