 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
After being cleared by ATC for an approach in IMC conditions, and a subsequent vector for traffic avoidance, the flight crew descended rapidly in response to a TCASII RA.
| Attributes | |
| ACN | 235756 |
| Time | |
| Date | 199303 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 8500 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : slc |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 600 |
| ASRS Report | 235756 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Level at 9000 ft, cleared for ILS approach to runway 34L at slc. We were issued a heading, a turn to the left (westerly) for traffic. Immediately there was a TA issued by TCASII. Traffic below us 200-300 ft and climbing. We were then issued an RA to descend at a rate of 4000 FPM. We followed RA and descended 500 ft below clearance altitude of 9000 ft. We notified ATC during descent of deviation.
Original NASA ASRS Text
Title: AFTER BEING CLRED BY ATC FOR AN APCH IN IMC CONDITIONS, AND A SUBSEQUENT VECTOR FOR TFC AVOIDANCE, THE FLC DSNDED RAPIDLY IN RESPONSE TO A TCASII RA.
Narrative: LEVEL AT 9000 FT, CLRED FOR ILS APCH TO RWY 34L AT SLC. WE WERE ISSUED A HDG, A TURN TO THE L (WESTERLY) FOR TFC. IMMEDIATELY THERE WAS A TA ISSUED BY TCASII. TFC BELOW US 200-300 FT AND CLBING. WE WERE THEN ISSUED AN RA TO DSND AT A RATE OF 4000 FPM. WE FOLLOWED RA AND DSNDED 500 FT BELOW CLRNC ALT OF 9000 FT. WE NOTIFIED ATC DURING DSCNT OF DEV.
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.