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ATCT local controller allowed air carrier-large transport to cross landing threshold with air carrier-medium large transport still on takeoff roll less than 6000' from approach end of runway.
| Attributes | |
| ACN | 95505 |
| Time | |
| Date | 198810 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : smf |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 50 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | landing other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local oversight : supervisor |
| Qualification | controller : developmental |
| ASRS Report | 95505 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : ground less severe incursion : runway non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 4500 vertical : 50 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Large transport X was allowed by ATC to cross the landing threshold while an medium large transport Y was still on the takeoff roll not yet airborne and less than 6000' down the runway (approximately 4500'). The slower than anticipated acceleration to rotation speed by medium large transport Y crew coupled with the specialist's hesitation to send large transport X around precipitated apparent less than standard separation.
Original NASA ASRS Text
Title: ATCT LCL CTLR ALLOWED ACR-LGT TO CROSS LNDG THRESHOLD WITH ACR-MLG STILL ON TKOF ROLL LESS THAN 6000' FROM APCH END OF RWY.
Narrative: LGT X WAS ALLOWED BY ATC TO CROSS THE LNDG THRESHOLD WHILE AN MLG Y WAS STILL ON THE TKOF ROLL NOT YET AIRBORNE AND LESS THAN 6000' DOWN THE RWY (APPROX 4500'). THE SLOWER THAN ANTICIPATED ACCELERATION TO ROTATION SPD BY MLG Y CREW COUPLED WITH THE SPECIALIST'S HESITATION TO SEND LGT X AROUND PRECIPITATED APPARENT LTSS.
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.