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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier aircraft in marginal VFR conditions overtook an small aircraft in level flight. ATC issued a climb restriction to the air carrier aircraft. TCASII equipment showed 300 ft separation, so the air carrier aircraft descended below his assigned altitude until the small aircraft was clear, then climbed to its assigned altitude.
| Attributes | |
| ACN | 206500 |
| Time | |
| Date | 199204 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pdz airport : ont |
| State Reference | CA |
| Altitude | msl bound lower : 4800 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ont |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Route In Use | departure other departure sid : sid enroute airway : ont |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 12000 flight time type : 1200 |
| ASRS Report | 206500 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Climbing out of ontario ATC restr us to 5000 ft MSL due to traffic over pdz VOR at 5500 ft. At about 4500 ft we got a TCASII TA. At about the same time ATC asked the small aircraft to confirm his altitude at 5500 ft. Leveling at 5000 ft we received an RA to descend. The traffic showed about 1 mi and 300 ft on the TCASII. We followed the RA, informed ATC of a 'TCASII descent' and descended while searching for the traffic. We spotted the traffic at 12 O'clock and above us as we were descending through 4800 ft MSL. We started an immediate return to 5000 ft and informed ATC of traffic in sight.
Original NASA ASRS Text
Title: ACR ACFT IN MARGINAL VFR CONDITIONS OVERTOOK AN SMA IN LEVEL FLT. ATC ISSUED A CLB RESTRICTION TO THE ACR ACFT. TCASII EQUIP SHOWED 300 FT SEPARATION, SO THE ACR ACFT DSNDED BELOW HIS ASSIGNED ALT UNTIL THE SMA WAS CLR, THEN CLBED TO ITS ASSIGNED ALT.
Narrative: CLBING OUT OF ONTARIO ATC RESTR US TO 5000 FT MSL DUE TO TFC OVER PDZ VOR AT 5500 FT. AT ABOUT 4500 FT WE GOT A TCASII TA. AT ABOUT THE SAME TIME ATC ASKED THE SMA TO CONFIRM HIS ALT AT 5500 FT. LEVELING AT 5000 FT WE RECEIVED AN RA TO DSND. THE TFC SHOWED ABOUT 1 MI AND 300 FT ON THE TCASII. WE FOLLOWED THE RA, INFORMED ATC OF A 'TCASII DSCNT' AND DSNDED WHILE SEARCHING FOR THE TFC. WE SPOTTED THE TFC AT 12 O'CLOCK AND ABOVE US AS WE WERE DSNDING THROUGH 4800 FT MSL. WE STARTED AN IMMEDIATE RETURN TO 5000 FT AND INFORMED ATC OF TFC IN SIGHT.
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.