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A beech 1900 flight failed to maintain assigned altitude and came within a reported 500 ft of another aircraft.
| Attributes | |
| ACN | 443751 |
| Time | |
| Date | 199907 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : aml.vor |
| State Reference | VA |
| Altitude | msl bound lower : 18700 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j220.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker BV Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 125 flight time total : 4100 flight time type : 1500 |
| ASRS Report | 443751 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were cruising at FL190 on J220 95 NM north of aml 009 degree radial. We had 29.92 set in altimeter and noticed a 150 ft difference between captain's and first officer's altimeter. Encoder was set to captain's side as it was my leg. I noticed aircraft Y fokker traffic crossing ahead at what looked like less than 1000 ft. Just then we got a TA for additional traffic crossing below. As I looked for traffic, I inadvertently descended 150 ft. As I checked altitude I noticed my error and climbed back to FL190. The aircraft Z B737 claimed on frequency that we were within 500 ft. While I did descend 150 ft while trying to pick up traffic visually, we were not within 500 ft. We verified our altitude with center and he showed us at FL190. No TA's were issued.
Original NASA ASRS Text
Title: A BEECH 1900 FLT FAILED TO MAINTAIN ASSIGNED ALT AND CAME WITHIN A RPTED 500 FT OF ANOTHER ACFT.
Narrative: WE WERE CRUISING AT FL190 ON J220 95 NM N OF AML 009 DEG RADIAL. WE HAD 29.92 SET IN ALTIMETER AND NOTICED A 150 FT DIFFERENCE BTWN CAPT'S AND FO'S ALTIMETER. ENCODER WAS SET TO CAPT'S SIDE AS IT WAS MY LEG. I NOTICED ACFT Y FOKKER TFC XING AHEAD AT WHAT LOOKED LIKE LESS THAN 1000 FT. JUST THEN WE GOT A TA FOR ADDITIONAL TFC XING BELOW. AS I LOOKED FOR TFC, I INADVERTENTLY DSNDED 150 FT. AS I CHKED ALT I NOTICED MY ERROR AND CLBED BACK TO FL190. THE ACFT Z B737 CLAIMED ON FREQ THAT WE WERE WITHIN 500 FT. WHILE I DID DSND 150 FT WHILE TRYING TO PICK UP TFC VISUALLY, WE WERE NOT WITHIN 500 FT. WE VERIFIED OUR ALT WITH CTR AND HE SHOWED US AT FL190. NO TA'S WERE ISSUED.
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.