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Traffic below the class B airspace at lax generates a TCASII alert for an air carrier descending on base leg.
| Attributes | |
| ACN | 598836 |
| Time | |
| Date | 200311 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : lax.airport |
| State Reference | CA |
| Altitude | msl single value : 2500 |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : traffic pattern |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon |
| Make Model Name | Helicopter |
| Flight Phase | other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 598836 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment : tcas other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Miss Distance | horizontal : 3000 vertical : 300 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
During night visual approach to lax, we received a TCASII alert on the right base leg. We were following a company B757. Our altitude was 2500 ft MSL and approximately 17 mi from lax. Our altitude was at the base of class B airspace. On base leg, we noticed a large structure fire just offset to our left on the right base leg. At about the same time we received a TCASII alert. The TCASII displayed a target at our 12 O'clock position immediately in front of us. TCASII alerted us to monitor vertical speed. We maintained level flight at 2500 ft MSL. We spotted a helicopter at our 11 O'clock position less than 1/2 mi. TCASII indicated the target about 300 ft below. It appeared to be circling the fire. No evasive action was taken. The approach was continued with landing on runway 25L.
Original NASA ASRS Text
Title: TFC BELOW THE CLASS B AIRSPACE AT LAX GENERATES A TCASII ALERT FOR AN ACR DSNDING ON BASE LEG.
Narrative: DURING NIGHT VISUAL APCH TO LAX, WE RECEIVED A TCASII ALERT ON THE R BASE LEG. WE WERE FOLLOWING A COMPANY B757. OUR ALT WAS 2500 FT MSL AND APPROX 17 MI FROM LAX. OUR ALT WAS AT THE BASE OF CLASS B AIRSPACE. ON BASE LEG, WE NOTICED A LARGE STRUCTURE FIRE JUST OFFSET TO OUR L ON THE R BASE LEG. AT ABOUT THE SAME TIME WE RECEIVED A TCASII ALERT. THE TCASII DISPLAYED A TARGET AT OUR 12 O'CLOCK POS IMMEDIATELY IN FRONT OF US. TCASII ALERTED US TO MONITOR VERT SPD. WE MAINTAINED LEVEL FLT AT 2500 FT MSL. WE SPOTTED A HELI AT OUR 11 O'CLOCK POS LESS THAN 1/2 MI. TCASII INDICATED THE TARGET ABOUT 300 FT BELOW. IT APPEARED TO BE CIRCLING THE FIRE. NO EVASIVE ACTION WAS TAKEN. THE APCH WAS CONTINUED WITH LNDG ON RWY 25L.
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.