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A B737-300 flight crew experiences a potential conflict with opposite direction same assigned altitude traffic near ontario, leveling off low thinking that their clearance may have been misinterp with ZLA, ca.
| Attributes | |
| ACN | 526794 |
| Time | |
| Date | 200110 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ont.airport |
| State Reference | CA |
| Altitude | msl single value : 16300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : prado 5 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Qualification | pilot : atp |
| Experience | flight time total : 20000 |
| ASRS Report | 526794 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 2400 flight time total : 5300 flight time type : 1000 |
| ASRS Report | 526795 |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : required legal separation non adherence : clearance non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | other |
| Miss Distance | horizontal : 9000 vertical : 700 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On climb out we both thought we were given a clearance to climb and maintain 17000 ft. We were given traffic at 17000 ft on a diverging course at less than a mile. Upon realizing that there might have been an incorrect clearance given we disengaged the autoplt as we passed through 16000 ft. We climbed to 16300 ft before returning to 16000. The traffic was now behind our aircraft and within a minute or so we were given a climb clearance to FL230. Supplemental information from acn 526795: climbing on the prado 5 departure out of ont, center gave us a climb to 17000 ft. Passing 16000 ft we saw traffic on the TCAS at 17000 ft and approximately 1 mi. The autoplt was disengaged and I stopped the climb at 16300 ft then descended to 16000 ft. As the traffic passed overhead center called out the traffic and gave us a climb to FL230. ATC didn't make any comments except to say thank you. We did not have a TCAS alert.
Original NASA ASRS Text
Title: A B737-300 FLC EXPERIENCES A POTENTIAL CONFLICT WITH OPPOSITE DIRECTION SAME ASSIGNED ALT TFC NEAR ONTARIO, LEVELING OFF LOW THINKING THAT THEIR CLRNC MAY HAVE BEEN MISINTERP WITH ZLA, CA.
Narrative: ON CLIMB OUT WE BOTH THOUGHT WE WERE GIVEN A CLRNC TO CLIMB AND MAINTAIN 17000 FT. WE WERE GIVEN TFC AT 17000 FT ON A DIVERGING COURSE AT LESS THAN A MILE. UPON REALIZING THAT THERE MIGHT HAVE BEEN AN INCORRECT CLRNC GIVEN WE DISENGAGED THE AUTOPLT AS WE PASSED THROUGH 16000 FT. WE CLIMBED TO 16300 FT BEFORE RETURNING TO 16000. THE TFC WAS NOW BEHIND OUR ACFT AND WITHIN A MINUTE OR SO WE WERE GIVEN A CLIMB CLRNC TO FL230. SUPPLEMENTAL INFO FROM ACN 526795: CLIMBING ON THE PRADO 5 DEP OUT OF ONT, CENTER GAVE US A CLIMB TO 17000 FT. PASSING 16000 FT WE SAW TFC ON THE TCAS AT 17000 FT AND APPROX 1 MI. THE AUTOPLT WAS DISENGAGED AND I STOPPED THE CLIMB AT 16300 FT THEN DESCENDED TO 16000 FT. AS THE TFC PASSED OVERHEAD CENTER CALLED OUT THE TFC AND GAVE US A CLIMB TO FL230. ATC DIDN'T MAKE ANY COMMENTS EXCEPT TO SAY THANK YOU. WE DID NOT HAVE A TCAS ALERT.
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.