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Air carrier medium large transport experienced opposite direction traffic that had a TCASII logic problem. Potential conflict.
| Attributes | |
| ACN | 267509 |
| Time | |
| Date | 199403 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : orf |
| State Reference | VA |
| Altitude | msl bound lower : 29000 msl bound upper : 29300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 8500 |
| ASRS Report | 267509 |
| 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 : clearance other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 30000 vertical : 300 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During cruise, TCASII issued an RA 'climb', then 'climb now' with vsi (vertical speed indicator) asking for maximum rate of climb. I started an immediate climb and left turn to avoid traffic which appeared to be climbing directly into our flight path head on. Traffic passed below us. We told center immediately of our actions. We climbed 300 ft and turned 30 degrees to the left. TCASII advised monitor 'vertical speed,' then clear of conflict. ATC gave us instructions to initially turn right, but we had already started a left turn. He assigned a heading and altitude back on course when conflict had passed. Center told us that the intruder had acted upon an RA for his TCASII and had climbed right into our altitude, which in turn set our TCASII alert off. Our system worked well. And ATC thanked us for our actions and cooperation.
Original NASA ASRS Text
Title: ACR MLG EXPERIENCED OPPOSITE DIRECTION TFC THAT HAD A TCASII LOGIC PROB. POTENTIAL CONFLICT.
Narrative: DURING CRUISE, TCASII ISSUED AN RA 'CLB', THEN 'CLB NOW' WITH VSI (VERT SPD INDICATOR) ASKING FOR MAX RATE OF CLB. I STARTED AN IMMEDIATE CLB AND L TURN TO AVOID TFC WHICH APPEARED TO BE CLBING DIRECTLY INTO OUR FLT PATH HEAD ON. TFC PASSED BELOW US. WE TOLD CTR IMMEDIATELY OF OUR ACTIONS. WE CLBED 300 FT AND TURNED 30 DEGS TO THE L. TCASII ADVISED MONITOR 'VERT SPD,' THEN CLEAR OF CONFLICT. ATC GAVE US INSTRUCTIONS TO INITIALLY TURN R, BUT WE HAD ALREADY STARTED A L TURN. HE ASSIGNED A HDG AND ALT BACK ON COURSE WHEN CONFLICT HAD PASSED. CTR TOLD US THAT THE INTRUDER HAD ACTED UPON AN RA FOR HIS TCASII AND HAD CLBED RIGHT INTO OUR ALT, WHICH IN TURN SET OUR TCASII ALERT OFF. OUR SYS WORKED WELL. AND ATC THANKED US FOR OUR ACTIONS AND COOPERATION.
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.