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Flight crew of a B737-300 failed to follow ATC instructions and turned base leg prior to ATC request causing a loss of separation with a B767 on final for another set of parallel runways.
| Attributes | |
| ACN | 341778 |
| Time | |
| Date | 199607 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : smo airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 4500 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach descent other |
| Route In Use | approach : visual arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | other other : other pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 3000 flight time type : 450 |
| ASRS Report | 341778 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : far non adherence : required legal separation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approaching the smo VOR we were told to 'depart smo on the 68 degree radial for the stadium visual -- descend and maintain 3500 ft MSL.' while on the 68 degree we were given speed reductions and told that a B767 would be landing on runway 24L and we were going to runway 24R at lax. Approach then told us to amend altitude to 4500 ft MSL -- we complied. The 'stadium visual' calls for a base turn at smo 68 degrees/9 DME. We thought that we had the B767 in sight. (The aircraft we saw was actually lined up for one of the 25 runways). The captain and I thought we were cleared for the 'stadium visual' so at 9 DME we turned base. Evidently we were not cleared to turn base. Immediately after making our base turn, approach control told us to make an immediate right turn direct to the field. We were now making a diagonal to the approach end to keep away from the B767 on the parallel. After making the turn toward the field the captain said 'we were executing the 'stadium visual' as cleared.' the control responded by saying, 'roger, I was ensuring separation.' the rest of the approach was uneventful. Upon landing we were told to call socal approach and informed of the loss of separation.
Original NASA ASRS Text
Title: FLC OF A B737-300 FAILED TO FOLLOW ATC INSTRUCTIONS AND TURNED BASE LEG PRIOR TO ATC REQUEST CAUSING A LOSS OF SEPARATION WITH A B767 ON FINAL FOR ANOTHER SET OF PARALLEL RWYS.
Narrative: APCHING THE SMO VOR WE WERE TOLD TO 'DEPART SMO ON THE 68 DEG RADIAL FOR THE STADIUM VISUAL -- DSND AND MAINTAIN 3500 FT MSL.' WHILE ON THE 68 DEG WE WERE GIVEN SPD REDUCTIONS AND TOLD THAT A B767 WOULD BE LNDG ON RWY 24L AND WE WERE GOING TO RWY 24R AT LAX. APCH THEN TOLD US TO AMEND ALT TO 4500 FT MSL -- WE COMPLIED. THE 'STADIUM VISUAL' CALLS FOR A BASE TURN AT SMO 68 DEGS/9 DME. WE THOUGHT THAT WE HAD THE B767 IN SIGHT. (THE ACFT WE SAW WAS ACTUALLY LINED UP FOR ONE OF THE 25 RWYS). THE CAPT AND I THOUGHT WE WERE CLRED FOR THE 'STADIUM VISUAL' SO AT 9 DME WE TURNED BASE. EVIDENTLY WE WERE NOT CLRED TO TURN BASE. IMMEDIATELY AFTER MAKING OUR BASE TURN, APCH CTL TOLD US TO MAKE AN IMMEDIATE R TURN DIRECT TO THE FIELD. WE WERE NOW MAKING A DIAGONAL TO THE APCH END TO KEEP AWAY FROM THE B767 ON THE PARALLEL. AFTER MAKING THE TURN TOWARD THE FIELD THE CAPT SAID 'WE WERE EXECUTING THE 'STADIUM VISUAL' AS CLRED.' THE CTL RESPONDED BY SAYING, 'ROGER, I WAS ENSURING SEPARATION.' THE REST OF THE APCH WAS UNEVENTFUL. UPON LNDG WE WERE TOLD TO CALL SOCAL APCH AND INFORMED OF THE LOSS OF SEPARATION.
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.