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Large transport in climb was passed by an medium large transport also in climb but at faster climb rate and higher airspeed.
| Attributes | |
| ACN | 125233 |
| Time | |
| Date | 198910 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pxn |
| State Reference | CA |
| Altitude | msl bound lower : 22600 msl bound upper : 22600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla tower : fra |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure 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 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 80 flight time total : 3000 flight time type : 1000 |
| ASRS Report | 125233 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 18000 flight time type : 5000 |
| ASRS Report | 125230 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | unspecified : 2000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
On climbout from lax we were held to 250 KTS, inbound to panache we were passing through about FL200, when we were cleared to climb to FL310. Within a very short time (I would guess less than 15 second) we were cleared to accelerate to cruise speed. I lowered the nose and began to accelerate. Initially I was holding about a 1000 FPM climb, but at that altitude and weight acceleration was very slow, so I lowered the nose further. I do not recall the climb rate during the entire time frame, but there was a short period of time (I would guess 30 seconds to 1 min) where we were level. During this period of acceleration an aircraft passed under us from right rear to left forward. We did not see the aircraft until approximately 120 seconds prior to crossing. We were never told of any conflicting traffic and the vertical separation did not appear unsafe. Approximately 1-2 mins after the aircraft passed, ZLA questioned our altitude. At that point, we were climbing through FL226. Again, we were not notified of any unusual situations or possible violations.
Original NASA ASRS Text
Title: LGT IN CLIMB WAS PASSED BY AN MLG ALSO IN CLIMB BUT AT FASTER CLIMB RATE AND HIGHER AIRSPEED.
Narrative: ON CLIMBOUT FROM LAX WE WERE HELD TO 250 KTS, INBND TO PANACHE WE WERE PASSING THROUGH ABOUT FL200, WHEN WE WERE CLRED TO CLIMB TO FL310. WITHIN A VERY SHORT TIME (I WOULD GUESS LESS THAN 15 SEC) WE WERE CLRED TO ACCELERATE TO CRUISE SPEED. I LOWERED THE NOSE AND BEGAN TO ACCELERATE. INITIALLY I WAS HOLDING ABOUT A 1000 FPM CLIMB, BUT AT THAT ALT AND WEIGHT ACCELERATION WAS VERY SLOW, SO I LOWERED THE NOSE FURTHER. I DO NOT RECALL THE CLIMB RATE DURING THE ENTIRE TIME FRAME, BUT THERE WAS A SHORT PERIOD OF TIME (I WOULD GUESS 30 SECS TO 1 MIN) WHERE WE WERE LEVEL. DURING THIS PERIOD OF ACCELERATION AN ACFT PASSED UNDER US FROM RIGHT REAR TO LEFT FORWARD. WE DID NOT SEE THE ACFT UNTIL APPROX 120 SECS PRIOR TO XING. WE WERE NEVER TOLD OF ANY CONFLICTING TFC AND THE VERTICAL SEPARATION DID NOT APPEAR UNSAFE. APPROX 1-2 MINS AFTER THE ACFT PASSED, ZLA QUESTIONED OUR ALT. AT THAT POINT, WE WERE CLIMBING THROUGH FL226. AGAIN, WE WERE NOT NOTIFIED OF ANY UNUSUAL SITUATIONS OR POSSIBLE VIOLATIONS.
Data retrieved from NASA's ASRS site as of August 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.