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TCASII RA creates an altitude deviation altitude excursion by PIC of air carrier medium large transport.
| Attributes | |
| ACN | 186820 |
| Time | |
| Date | 199108 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : vuz airport : bhm |
| State Reference | AL |
| Altitude | msl bound lower : 5600 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bhm |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 350 flight time total : 15000 flight time type : 2500 |
| ASRS Report | 186820 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : far non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 900 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Approach called traffic at 6500 VFR over the VOR. We were descending and TCASII gave us a TA showing traffic 200 ft above us about 3 mi ahead. I increased rate of descent and at 6000 ft TA became an RA, commanding a min descent rate of 1200 FPM. We never saw the traffic and the RA called clear. We descended about 300-400 ft below our assigned altitude, and advised same, simultaneously being reclred to 5000 ft. Other than the RA being issued, no traffic was observed. The supposed VFR traffic was not operating in VFR conditions. As a side note, when TCASII goes off everybody, captain and first officer, look inside at TCASII. I strongly feel 1 pilot should immediately 'go outside' while the other pilot calls the traffic position from TCASII, while following the RA.
Original NASA ASRS Text
Title: TCASII RA CREATES AN ALT DEV ALT EXCURSION BY PIC OF ACR MLG.
Narrative: APCH CALLED TFC AT 6500 VFR OVER THE VOR. WE WERE DSNDING AND TCASII GAVE US A TA SHOWING TFC 200 FT ABOVE US ABOUT 3 MI AHEAD. I INCREASED RATE OF DSCNT AND AT 6000 FT TA BECAME AN RA, COMMANDING A MIN DSCNT RATE OF 1200 FPM. WE NEVER SAW THE TFC AND THE RA CALLED CLR. WE DSNDED ABOUT 300-400 FT BELOW OUR ASSIGNED ALT, AND ADVISED SAME, SIMULTANEOUSLY BEING RECLRED TO 5000 FT. OTHER THAN THE RA BEING ISSUED, NO TFC WAS OBSERVED. THE SUPPOSED VFR TFC WAS NOT OPERATING IN VFR CONDITIONS. AS A SIDE NOTE, WHEN TCASII GOES OFF EVERYBODY, CAPT AND FO, LOOK INSIDE AT TCASII. I STRONGLY FEEL 1 PLT SHOULD IMMEDIATELY 'GO OUTSIDE' WHILE THE OTHER PLT CALLS THE TFC POS FROM TCASII, WHILE FOLLOWING THE RA.
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.