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Cga pilot at FL410 is issued traffic below climbing to FL390, gets a TCASII TA on the traffic and claims that the aircraft climbed above him.
| Attributes | |
| ACN | 347688 |
| Time | |
| Date | 199609 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gso |
| State Reference | NC |
| Altitude | msl bound lower : 41000 msl bound upper : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Gates Learjet Corp Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 110 flight time total : 5000 flight time type : 1000 |
| ASRS Report | 347688 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 1000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Flying at FL410 ATC called traffic 1-2 O'clock, leveling FL390. We had a visual on TCASII which showed traffic at FL390 and FL391. We got a TA when the lear (20-30 series) showed up as 1900 ft below us. Approximately 2 seconds later, the lear passed above us approximately 500-1000 ft in our 2-3 O'clock position, opposite direction. The PF had a clear view and said it was a lear 20 or 30 series. I saw the aircraft but not long enough to determine a 20 or 30 series lear. ATC said they did see targets merge and asked us to confirm FL410 and 29.92 inches. We reported checked and also checked onboard avionics diagnostics. No item reflected failure or past fault. Aircraft has 3 separate system for altitude indications -- air data computer #1, #2 and a standby system -- all read FL410.
Original NASA ASRS Text
Title: CGA PLT AT FL410 IS ISSUED TFC BELOW CLBING TO FL390, GETS A TCASII TA ON THE TFC AND CLAIMS THAT THE ACFT CLBED ABOVE HIM.
Narrative: FLYING AT FL410 ATC CALLED TFC 1-2 O'CLOCK, LEVELING FL390. WE HAD A VISUAL ON TCASII WHICH SHOWED TFC AT FL390 AND FL391. WE GOT A TA WHEN THE LEAR (20-30 SERIES) SHOWED UP AS 1900 FT BELOW US. APPROX 2 SECONDS LATER, THE LEAR PASSED ABOVE US APPROX 500-1000 FT IN OUR 2-3 O'CLOCK POS, OPPOSITE DIRECTION. THE PF HAD A CLR VIEW AND SAID IT WAS A LEAR 20 OR 30 SERIES. I SAW THE ACFT BUT NOT LONG ENOUGH TO DETERMINE A 20 OR 30 SERIES LEAR. ATC SAID THEY DID SEE TARGETS MERGE AND ASKED US TO CONFIRM FL410 AND 29.92 INCHES. WE RPTED CHKED AND ALSO CHKED ONBOARD AVIONICS DIAGNOSTICS. NO ITEM REFLECTED FAILURE OR PAST FAULT. ACFT HAS 3 SEPARATE SYS FOR ALT INDICATIONS -- AIR DATA COMPUTER #1, #2 AND A STANDBY SYS -- ALL READ FL410.
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.