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Air carrier X TCASII RA with air carrier Y following evasive action taken climb caused less than standard wake turbulence separation. Pilot deviation.
| Attributes | |
| ACN | 260041 |
| Time | |
| Date | 199312 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lax tower : emt |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing : go around |
| Route In Use | approach : straight in |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller radar : 12 |
| ASRS Report | 260041 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X, large transport on visual approach runway 25L received TCASII alert on air carrier Y, light transport visual approach runway 25L. Air carrier X said he was climbing to resolve conflict. I informed air carrier X that air carrier Y was maintaining visual separation from him. I then instructed air carrier X to descend and maintain 2000 ft due to VFR traffic above and ahead of him. Air carrier X was then resequenced with arrival traffic without further incident. Air carrier X was informed of air carrier Y by los angeles approach prior to handoff to lax tower. When air carrier X climbed to resolve conflict, it placed air carrier Y in his wake. Since the implementation of TCASII, I have yet to witness a single event in class B airspace which has warranted the alert. In fact, every event I've witnessed has compromised the safety of the air crew and unnecessarily increased the workload of the controllers involved.
Original NASA ASRS Text
Title: ACR X TCASII RA WITH ACR Y FOLLOWING EVASIVE ACTION TAKEN CLB CAUSED LESS THAN STANDARD WAKE TURB SEPARATION. PLTDEV.
Narrative: ACR X, LGT ON VISUAL APCH RWY 25L RECEIVED TCASII ALERT ON ACR Y, LTT VISUAL APCH RWY 25L. ACR X SAID HE WAS CLBING TO RESOLVE CONFLICT. I INFORMED ACR X THAT ACR Y WAS MAINTAINING VISUAL SEPARATION FROM HIM. I THEN INSTRUCTED ACR X TO DSND AND MAINTAIN 2000 FT DUE TO VFR TFC ABOVE AND AHEAD OF HIM. ACR X WAS THEN RESEQUENCED WITH ARR TFC WITHOUT FURTHER INCIDENT. ACR X WAS INFORMED OF ACR Y BY LOS ANGELES APCH PRIOR TO HDOF TO LAX TWR. WHEN ACR X CLBED TO RESOLVE CONFLICT, IT PLACED ACR Y IN HIS WAKE. SINCE THE IMPLEMENTATION OF TCASII, I HAVE YET TO WITNESS A SINGLE EVENT IN CLASS B AIRSPACE WHICH HAS WARRANTED THE ALERT. IN FACT, EVERY EVENT I'VE WITNESSED HAS COMPROMISED THE SAFETY OF THE AIR CREW AND UNNECESSARILY INCREASED THE WORKLOAD OF THE CTLRS INVOLVED.
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.