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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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2 aircraft approaching head-on. 1 aircraft was issued a climb to a higher altitude which resulted in less than standard separation.
| Attributes | |
| ACN | 146988 |
| Time | |
| Date | 199005 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bpi |
| State Reference | WY |
| Altitude | msl bound lower : 35000 msl bound upper : 36700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| ASRS Report | 146988 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 25200 vertical : 1700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The 2 aircraft were 8 mins apart. Eastbound large transport requested climb from FL330 to FL370. Westbound medium large transport head-on traffic at FL350. The large transport was cleared to FL370. When mode C indicated FL350, the large transport appeared to be climbing too slowly and was given a restriction to be level at FL370 in 2 mins. The pilot said he was doing 500 FPM. The large transport and medium large transport were both issued left turns. Both pilots acknowledged. The mlt said that he saw his traffic. The medium large transport did not appear to turn for about another minute. The large transport reported FL370 and both aircraft were cleared on course.
Original NASA ASRS Text
Title: 2 ACFT APCHING HEAD-ON. 1 ACFT WAS ISSUED A CLIMB TO A HIGHER ALT WHICH RESULTED IN LESS THAN STANDARD SEPARATION.
Narrative: THE 2 ACFT WERE 8 MINS APART. EBND LGT REQUESTED CLB FROM FL330 TO FL370. WBND MLG HEAD-ON TFC AT FL350. THE LGT WAS CLRED TO FL370. WHEN MODE C INDICATED FL350, THE LGT APPEARED TO BE CLBING TOO SLOWLY AND WAS GIVEN A RESTRICTION TO BE LEVEL AT FL370 IN 2 MINS. THE PLT SAID HE WAS DOING 500 FPM. THE LGT AND MLG WERE BOTH ISSUED LEFT TURNS. BOTH PLTS ACKNOWLEDGED. THE MLT SAID THAT HE SAW HIS TFC. THE MLG DID NOT APPEAR TO TURN FOR ABOUT ANOTHER MINUTE. THE LGT RPTED FL370 AND BOTH ACFT WERE CLRED ON COURSE.
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.