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An medium large transport climbed through an altitude of a VFR aircraft passing through the TCA without standard separation.
| Attributes | |
| ACN | 171633 |
| Time | |
| Date | 199102 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax tower : lax tower : sfo |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| ASRS Report | 171633 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I cleared medium large transport X for takeoff runway 7L using the following clearance: 'medium large transport X, fly heading 0707 degrees, cross the lax VOR 7 DME at or below 2000', maintain 5000', runway 7 cleared for takeoff.' the pilot read back: 'fly heading 070 degrees, maintain 5000', cleared for takeoff,' and I did not hear the incorrect readback. The aircraft departed and at 3 DME east of the lax VOR an small aircraft Y was transitioning the TCA on a 140 degree heading level at 3000'. The medium large transport X was on departure control frequency and proceeded to climb through the altitude of small aircraft Y. I believe the long instructions required to be given each departure are a contributed factor. Possible preventive measures: change procedures to issue the lower altitude only.
Original NASA ASRS Text
Title: AN MLG CLIMBED THROUGH AN ALT OF A VFR ACFT PASSING THROUGH THE TCA WITHOUT STANDARD SEPARATION.
Narrative: I CLRED MLG X FOR TKOF RWY 7L USING THE FOLLOWING CLRNC: 'MLG X, FLY HDG 0707 DEGS, CROSS THE LAX VOR 7 DME AT OR BELOW 2000', MAINTAIN 5000', RWY 7 CLRED FOR TKOF.' THE PLT READ BACK: 'FLY HDG 070 DEGS, MAINTAIN 5000', CLRED FOR TKOF,' AND I DID NOT HEAR THE INCORRECT READBACK. THE ACFT DEPARTED AND AT 3 DME E OF THE LAX VOR AN SMA Y WAS TRANSITIONING THE TCA ON A 140 DEG HDG LEVEL AT 3000'. THE MLG X WAS ON DEP CTL FREQ AND PROCEEDED TO CLB THROUGH THE ALT OF SMA Y. I BELIEVE THE LONG INSTRUCTIONS REQUIRED TO BE GIVEN EACH DEP ARE A CONTRIBUTED FACTOR. POSSIBLE PREVENTIVE MEASURES: CHANGE PROCS TO ISSUE THE LOWER ALT ONLY.
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.