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ARTCC controller descends BE36 from 10000 ft to 9000 ft. Pilot descends below assigned altitude and conflicts with climbing E120. ZNY quality assurance conflict patch alerts of separation loss.
| Attributes | |
| ACN | 408510 |
| Time | |
| Date | 199807 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : har |
| State Reference | PA |
| Altitude | msl bound lower : 8000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 36 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air taxi |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : instrument |
| Experience | controller non radar : 15 flight time total : 318 |
| ASRS Report | 408510 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
BE36 bonanza checked on my frequency level at 10000 ft. BE36 was issued current altimeter setting at harrisburg, and was issued a clearance to descend to 9000 ft. BE36 reads back 9000 ft over harrisburg VORTAC, BE36 was observed below his assigned altitude. Pilot was queried to verify at 9000 ft and stated that he was cleared to 8000 ft. BE36 was told to climb to 9000 ft and was advised his assigned altitude was 9000 ft. Loss of separation with E120 over harrisburg at 8000 ft. E120 pilot took evasive action. BE36 pilot did not see E120 traffic. Loss of separation detected by ZNY quality assurance patch.
Original NASA ASRS Text
Title: ARTCC CTLR DSNDS BE36 FROM 10000 FT TO 9000 FT. PLT DSNDS BELOW ASSIGNED ALT AND CONFLICTS WITH CLBING E120. ZNY QUALITY ASSURANCE CONFLICT PATCH ALERTS OF SEPARATION LOSS.
Narrative: BE36 BONANZA CHKED ON MY FREQ LEVEL AT 10000 FT. BE36 WAS ISSUED CURRENT ALTIMETER SETTING AT HARRISBURG, AND WAS ISSUED A CLRNC TO DSND TO 9000 FT. BE36 READS BACK 9000 FT OVER HARRISBURG VORTAC, BE36 WAS OBSERVED BELOW HIS ASSIGNED ALT. PLT WAS QUERIED TO VERIFY AT 9000 FT AND STATED THAT HE WAS CLRED TO 8000 FT. BE36 WAS TOLD TO CLB TO 9000 FT AND WAS ADVISED HIS ASSIGNED ALT WAS 9000 FT. LOSS OF SEPARATION WITH E120 OVER HARRISBURG AT 8000 FT. E120 PLT TOOK EVASIVE ACTION. BE36 PLT DID NOT SEE E120 TFC. LOSS OF SEPARATION DETECTED BY ZNY QUALITY ASSURANCE PATCH.
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.