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During expedited descent, center called for aircraft to maintain 11000 ft, but due to high descent rate, reporter was unable. The VFR traffic was acquired visually and evasive action taken. Near midair collision.
| Attributes | |
| ACN | 322522 |
| Time | |
| Date | 199512 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ign |
| State Reference | NY |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : n90 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 16000 flight time type : 500 |
| ASRS Report | 322522 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : nmac non adherence : far other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Cleared to expedite to 10000 ft. Selected level change on FMC with IAS 330 selected. This traded altitude for airspeed to produce more than 6000 FPM descent. At approximately 12000 ft, center amended our altitude to 'maintain 11000 ft for VFR traffic.' no way to comply. As I was trying to 'level the aircraft' my first officer acquired the other aircraft and applied more forward pressure on the control column. We leveled at 10000 ft and was given a frequency change. At night it's much harder to judge distances so I'm thankful my first officer saw the traffic earlier and moved us out of the aircraft path.
Original NASA ASRS Text
Title: DURING EXPEDITED DSCNT, CTR CALLED FOR ACFT TO MAINTAIN 11000 FT, BUT DUE TO HIGH DSCNT RATE, RPTR WAS UNABLE. THE VFR TFC WAS ACQUIRED VISUALLY AND EVASIVE ACTION TAKEN. NMAC.
Narrative: CLRED TO EXPEDITE TO 10000 FT. SELECTED LEVEL CHANGE ON FMC WITH IAS 330 SELECTED. THIS TRADED ALT FOR AIRSPD TO PRODUCE MORE THAN 6000 FPM DSCNT. AT APPROX 12000 FT, CTR AMENDED OUR ALT TO 'MAINTAIN 11000 FT FOR VFR TFC.' NO WAY TO COMPLY. AS I WAS TRYING TO 'LEVEL THE ACFT' MY FO ACQUIRED THE OTHER ACFT AND APPLIED MORE FORWARD PRESSURE ON THE CTL COLUMN. WE LEVELED AT 10000 FT AND WAS GIVEN A FREQ CHANGE. AT NIGHT IT'S MUCH HARDER TO JUDGE DISTANCES SO I'M THANKFUL MY FO SAW THE TFC EARLIER AND MOVED US OUT OF THE ACFT PATH.
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.