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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ARTCC radar controller vectoring a C550 for traffic and descending him for 'chop' put him on a heading that was going to cause a conflict with a B757. Controller issued turns to both aircraft to ensure separation and the C550 questioned his altitude assignment and did not complete the turn as assigned. Less than standard separation occurred.
| Attributes | |
| ACN | 337590 |
| Time | |
| Date | 199606 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : day |
| State Reference | OH |
| Altitude | msl bound lower : 27300 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 337590 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 22800 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Small transport X, C550, was en route descending for chop on a heading for traffic. Another aircraft became traffic (air carrier Y) for small transport X. Small transport X was asked rate of descent. Rate was sufficient for separation. Small transport X was also told to be level at FL270 in a min. Small transport X then questioned his assigned altitude and questioned 'level at FL270 or FL280.' small transport X also stopped his descent and climbed 100 ft. Small transport X was told level at FL270 in less than a min. Small transport X did not comply. Turns were issued to air carrier Y and small transport X. Small transport X was issued a 360 degree heading. Small transport X only turned approximately 30 degree left from his 60 degree heading. He should have turned 60 degrees left to a 360 degree heading as he was told.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR VECTORING A C550 FOR TFC AND DSNDING HIM FOR 'CHOP' PUT HIM ON A HDG THAT WAS GOING TO CAUSE A CONFLICT WITH A B757. CTLR ISSUED TURNS TO BOTH ACFT TO ENSURE SEPARATION AND THE C550 QUESTIONED HIS ALT ASSIGNMENT AND DID NOT COMPLETE THE TURN AS ASSIGNED. LTSS OCCURRED.
Narrative: SMT X, C550, WAS ENRTE DSNDING FOR CHOP ON A HDG FOR TFC. ANOTHER ACFT BECAME TFC (ACR Y) FOR SMT X. SMT X WAS ASKED RATE OF DSCNT. RATE WAS SUFFICIENT FOR SEPARATION. SMT X WAS ALSO TOLD TO BE LEVEL AT FL270 IN A MIN. SMT X THEN QUESTIONED HIS ASSIGNED ALT AND QUESTIONED 'LEVEL AT FL270 OR FL280.' SMT X ALSO STOPPED HIS DSCNT AND CLBED 100 FT. SMT X WAS TOLD LEVEL AT FL270 IN LESS THAN A MIN. SMT X DID NOT COMPLY. TURNS WERE ISSUED TO ACR Y AND SMT X. SMT X WAS ISSUED A 360 DEG HDG. SMT X ONLY TURNED APPROX 30 DEG L FROM HIS 60 DEG HDG. HE SHOULD HAVE TURNED 60 DEGS L TO A 360 DEG HDG AS HE WAS TOLD.
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.