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Radar handoff controller heard radar controller descend a private jet and later, when a conflict occurred with an air carrier, did not see a mode C altitude on the private jet.
| Attributes | |
| ACN | 491707 |
| Time | |
| Date | 200011 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : mol.vor |
| State Reference | VA |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : radar pilot : private pilot : instrument |
| Experience | controller radar : 13 controller time certified in position1 : 1 flight time total : 325 |
| ASRS Report | 491707 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar instruction : instructor |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action none taken : detected after the fact |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X checked on at FL410. Aircraft X was given a code change. Aircraft X was told to cross denny at FL330. Aircraft X read back the clearance correctly. Then I answered a handoff line. During my absence, aircraft X was switched to another frequency. Approximately 4 mins later, aircraft X's mode C was missing from the radar. An air carrier Y reported a TCASII resolution descent because he showed an aircraft at FL310 going eastbound. The air carrier Y, who was swbound at FL310, then descended to FL290.
Original NASA ASRS Text
Title: RADAR HDOF CTLR HEARD RADAR CTLR DSND A PVT JET AND LATER, WHEN A CONFLICT OCCURRED WITH AN ACR, DID NOT SEE A MODE C ALT ON THE PVT JET.
Narrative: ACFT X CHKED ON AT FL410. ACFT X WAS GIVEN A CODE CHANGE. ACFT X WAS TOLD TO CROSS DENNY AT FL330. ACFT X READ BACK THE CLRNC CORRECTLY. THEN I ANSWERED A HDOF LINE. DURING MY ABSENCE, ACFT X WAS SWITCHED TO ANOTHER FREQ. APPROX 4 MINS LATER, ACFT X'S MODE C WAS MISSING FROM THE RADAR. AN ACR Y RPTED A TCASII RESOLUTION DSCNT BECAUSE HE SHOWED AN ACFT AT FL310 GOING EBOUND. THE ACR Y, WHO WAS SWBOUND AT FL310, THEN DSNDED TO FL290.
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.