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Altitude deviation altitude excursion by air carrier medium large transport in evasive action climb. Flight crew response to TCASII RA in accord with airline management policy operational procedure.
| Attributes | |
| ACN | 238836 |
| Time | |
| Date | 199304 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | IN |
| Altitude | msl bound lower : 29000 msl bound upper : 29200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| 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 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 6000 flight time type : 45 |
| ASRS Report | 238826 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action flight crew : became reoriented |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 1000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were at cruise, FL290, when we received first a TCASII warning, then a conflict RA. Other aircraft was another air carrier aircraft medium large transport or large transport and was visible in what may have been a climbing turn passing rapidly from our 2 O'clock to 9 O'clock position. We followed the TCASII RA to climb and climbed about 200 ft before it ceased. We made a call to center that we had a TCASII RA and were 'leaving 290.' after the advisory was over, we all, both planes and center, talked it over. Other air carrier and center both said aircraft Y level at FL280, and for that matter, center did not see us leave FL290, though it was only about 200 ft. Even though we were clear of clouds at that time, it was difficult to determine whether the other plane was in level flight. Combined with the optical effects, I chose not to ignore the TCASII. This seems to be mostly a spurious TCASII advisory, combined with atmospheric conditions which precluded ignoring the alert, even though both aircraft were mutually visible.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION BY ACR MLG IN EVASIVE ACTION CLB. FLC RESPONSE TO TCASII RA IN ACCORD WITH AIRLINE MGMNT POLICY OPERATIONAL PROC.
Narrative: WE WERE AT CRUISE, FL290, WHEN WE RECEIVED FIRST A TCASII WARNING, THEN A CONFLICT RA. OTHER ACFT WAS ANOTHER ACR ACFT MLG OR LGT AND WAS VISIBLE IN WHAT MAY HAVE BEEN A CLBING TURN PASSING RAPIDLY FROM OUR 2 O'CLOCK TO 9 O'CLOCK POS. WE FOLLOWED THE TCASII RA TO CLB AND CLBED ABOUT 200 FT BEFORE IT CEASED. WE MADE A CALL TO CTR THAT WE HAD A TCASII RA AND WERE 'LEAVING 290.' AFTER THE ADVISORY WAS OVER, WE ALL, BOTH PLANES AND CTR, TALKED IT OVER. OTHER ACR AND CTR BOTH SAID ACFT Y LEVEL AT FL280, AND FOR THAT MATTER, CTR DID NOT SEE US LEAVE FL290, THOUGH IT WAS ONLY ABOUT 200 FT. EVEN THOUGH WE WERE CLR OF CLOUDS AT THAT TIME, IT WAS DIFFICULT TO DETERMINE WHETHER THE OTHER PLANE WAS IN LEVEL FLT. COMBINED WITH THE OPTICAL EFFECTS, I CHOSE NOT TO IGNORE THE TCASII. THIS SEEMS TO BE MOSTLY A SPURIOUS TCASII ADVISORY, COMBINED WITH ATMOSPHERIC CONDITIONS WHICH PRECLUDED IGNORING THE ALERT, EVEN THOUGH BOTH ACFT WERE MUTUALLY VISIBLE.
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.