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Flight crew pilot deviation from clearance as rate of descent altered in pilot response to TCASII target acquisition.
| Attributes | |
| ACN | 203312 |
| Time | |
| Date | 199202 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sfm airport : smf |
| State Reference | CA |
| Altitude | msl bound lower : 3000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 5000 flight time type : 1500 |
| ASRS Report | 203312 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending into smf numerous targets on TCASII. TCASII at 10 mi range. Approach cleared us to 3000 ft. Descending through 5000 ft, approach called VFR target 3 mi. TCASII showed him less that 500 ft vertical and inside inner ring. Rather than getting TA's or RA advisories, decide to level off and avoid a TCASII encounter. Action was appropriate. TCASII was a valuable tool, but leaves doubt as what to believe (approach or TCASII). Neither the first officer or myself saw the other target.
Original NASA ASRS Text
Title: FLC PLTDEV FROM CLRNC AS RATE OF DSCNT ALTERED IN PLT RESPONSE TO TCASII TARGET ACQUISITION.
Narrative: DSNDING INTO SMF NUMEROUS TARGETS ON TCASII. TCASII AT 10 MI RANGE. APCH CLRED US TO 3000 FT. DSNDING THROUGH 5000 FT, APCH CALLED VFR TARGET 3 MI. TCASII SHOWED HIM LESS THAT 500 FT VERT AND INSIDE INNER RING. RATHER THAN GETTING TA'S OR RA ADVISORIES, DECIDE TO LEVEL OFF AND AVOID A TCASII ENCOUNTER. ACTION WAS APPROPRIATE. TCASII WAS A VALUABLE TOOL, BUT LEAVES DOUBT AS WHAT TO BELIEVE (APCH OR TCASII). NEITHER THE FO OR MYSELF SAW THE OTHER TARGET.
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.