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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier X non adherence to ATC clearance TCASII TA had less than standard separation from air carrier Y. System error. Pilot deviation. Evasive action taken.
| Attributes | |
| ACN | 259763 |
| Time | |
| Date | 199312 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : hnl |
| State Reference | HI |
| Altitude | msl bound lower : 37000 msl bound upper : 38000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : oak |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : other oceanic |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody Transport |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other descent other |
| Route In Use | enroute : other oceanic |
| Flight Plan | IFR |
| 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 : 19000 flight time type : 600 |
| ASRS Report | 259763 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 15000 flight time type : 1200 |
| ASRS Report | 259956 |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe inflight encounter other non adherence : required legal separation non adherence : clearance non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | horizontal : 42000 vertical : 1000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
ZOA via hnl arinc requested air carrier X climb from FL370 to FL390. As we climbed, at approximately FL385 turbulence began to get moderate plus and it was obvious it would be unsafe to continue climb, advised hnl arinc unable to climb and was descending back down to FL370. At approximately FL380 it was apparent another air carrier Y was at FL370 approximately 7 NM away by TCASII and visual sighting. We leveled at FL380 and advised arinc of conflict and leveled at FL380. Arinc (ZOA) then cleared back down to FL370, later advised by arinc to contact ZOA supervisor and did so upon landing. ZOA said possible pilot deviation, but controller apparently also erred since he cleared other aircraft to FL370 before we got to FL390. We never got to it or reported level. Supplemental information from acn 259956: ATC requested air carrier X climb from FL370 to FL390 and report level. Some light chop at FL370. During climb encountered moderate turbulence as we approached FL390. Told arinc we would be unable to maintain FL390 and were returning to FL370. As we descended we saw on our TCASII that air carrier Y that had been at FL350 had just leveled at FL370 approximately 7 NM ahead of us. We notified arinc that we would level off at FL380 and that we could maintain FL380. ATC cleared us back to FL350 and reclred us to FL370.
Original NASA ASRS Text
Title: ACR X NON ADHERENCE TO ATC CLRNC TCASII TA HAD LTSS FROM ACR Y. SYS ERROR. PLTDEV. EVASIVE ACTION TAKEN.
Narrative: ZOA VIA HNL ARINC REQUESTED ACR X CLB FROM FL370 TO FL390. AS WE CLBED, AT APPROX FL385 TURB BEGAN TO GET MODERATE PLUS AND IT WAS OBVIOUS IT WOULD BE UNSAFE TO CONTINUE CLB, ADVISED HNL ARINC UNABLE TO CLB AND WAS DSNDING BACK DOWN TO FL370. AT APPROX FL380 IT WAS APPARENT ANOTHER ACR Y WAS AT FL370 APPROX 7 NM AWAY BY TCASII AND VISUAL SIGHTING. WE LEVELED AT FL380 AND ADVISED ARINC OF CONFLICT AND LEVELED AT FL380. ARINC (ZOA) THEN CLRED BACK DOWN TO FL370, LATER ADVISED BY ARINC TO CONTACT ZOA SUPVR AND DID SO UPON LNDG. ZOA SAID POSSIBLE PLTDEV, BUT CTLR APPARENTLY ALSO ERRED SINCE HE CLRED OTHER ACFT TO FL370 BEFORE WE GOT TO FL390. WE NEVER GOT TO IT OR RPTED LEVEL. SUPPLEMENTAL INFORMATION FROM ACN 259956: ATC REQUESTED ACR X CLB FROM FL370 TO FL390 AND RPT LEVEL. SOME LIGHT CHOP AT FL370. DURING CLB ENCOUNTERED MODERATE TURB AS WE APCHED FL390. TOLD ARINC WE WOULD BE UNABLE TO MAINTAIN FL390 AND WERE RETURNING TO FL370. AS WE DSNDED WE SAW ON OUR TCASII THAT ACR Y THAT HAD BEEN AT FL350 HAD JUST LEVELED AT FL370 APPROX 7 NM AHEAD OF US. WE NOTIFIED ARINC THAT WE WOULD LEVEL OFF AT FL380 AND THAT WE COULD MAINTAIN FL380. ATC CLRED US BACK TO FL350 AND RECLRED US TO FL370.
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.