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See and avoid concept. Evasive action descent. Air carrier gets a TCASII and an ATC TA given at the same time. They acquire 1 aircraft visually, but follow the next TCASII RA and descend below their assigned altitude.
| Attributes | |
| ACN | 305361 |
| Time | |
| Date | 199505 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : swr airport : smf |
| State Reference | CA |
| Altitude | msl bound lower : 2500 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : smf |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| 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 : second officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 6500 flight time type : 727 |
| ASRS Report | 305361 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 300 vertical : 300 |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent into smf on the flunk 3 arrival. ATC clearance to 3000 ft. Cloud tops approximately 4000 ft broken with haze. Descending through 4800 ft we received an ATC altitude alert and TCASII TA simultaneously. The first officer immediately visually acquired the traffic (a light colored single engine aircraft at approximately 4000 ft) just as TCASII issued a monitor vertical descent alert. Almost simultaneously the first officer called for a left turn as TCASII issued an RA to increase vertical descent. We leveled off at 2500 ft, clear of traffic, and returned to our ATC assigned altitude of 3000 ft.
Original NASA ASRS Text
Title: SEE AND AVOID CONCEPT. EVASIVE ACTION DSCNT. ACR GETS A TCASII AND AN ATC TA GIVEN AT THE SAME TIME. THEY ACQUIRE 1 ACFT VISUALLY, BUT FOLLOW THE NEXT TCASII RA AND DSND BELOW THEIR ASSIGNED ALT.
Narrative: ON DSCNT INTO SMF ON THE FLUNK 3 ARR. ATC CLRNC TO 3000 FT. CLOUD TOPS APPROX 4000 FT BROKEN WITH HAZE. DSNDING THROUGH 4800 FT WE RECEIVED AN ATC ALT ALERT AND TCASII TA SIMULTANEOUSLY. THE FO IMMEDIATELY VISUALLY ACQUIRED THE TFC (A LIGHT COLORED SINGLE ENG ACFT AT APPROX 4000 FT) JUST AS TCASII ISSUED A MONITOR VERT DSCNT ALERT. ALMOST SIMULTANEOUSLY THE FO CALLED FOR A L TURN AS TCASII ISSUED AN RA TO INCREASE VERT DSCNT. WE LEVELED OFF AT 2500 FT, CLR OF TFC, AND RETURNED TO OUR ATC ASSIGNED ALT OF 3000 FT.
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.