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Tower had an air carrier medium large transport taxi into position and hold on runway 25R, while on the runway they heard and saw a DH6 pass overhead in close proximity. The medium large transport was not given a TA, nor was the DH6 told about the medium large transport on the runway. Reporter found out after takeoff that the DH6 was a practice approach.
| Attributes | |
| ACN | 353399 |
| Time | |
| Date | 199611 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | agl bound lower : 0 agl bound upper : 300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : las |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | ground : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Twin Otter DHC-6 |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent : approach landing : go around |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 353339 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : ground critical conflict : nmac |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We had taxied to runway 25R at las. We switched to tower and were cleared into position on runway 25R. After we took the runway, the tower informed us that we would be holding fix for several mins due to departures on runway 19. I was not concerned since I knew that arrs were going to runway 25L and the runways 19's. The tower frequency was very busy and I thought I heard someone check in with the tower on a practice approach. I missed the runway that they were flying the approach to and I asked my first officer if he heard which runway they were flying the practice approach to. He also had not heard which runway he was going to. I tried to break in on the frequency to ask where this aircraft was but was unsuccessful. About this time an aircraft showed up on TCASII directly behind us, 300 ft above and descending. I was about ready to taxi clear of the runway when I heard and could feel the vibration of the twin otter as he went missed approach over the top and just to the left of my aircraft. When he cleared, tower cleared us for takeoff and didn't say a word about the twin otter. We got the information on him after takeoff.
Original NASA ASRS Text
Title: TWR HAD AN ACR MLG TAXI INTO POS AND HOLD ON RWY 25R, WHILE ON THE RWY THEY HEARD AND SAW A DH6 PASS OVERHEAD IN CLOSE PROX. THE MLG WAS NOT GIVEN A TA, NOR WAS THE DH6 TOLD ABOUT THE MLG ON THE RWY. RPTR FOUND OUT AFTER TKOF THAT THE DH6 WAS A PRACTICE APCH.
Narrative: WE HAD TAXIED TO RWY 25R AT LAS. WE SWITCHED TO TWR AND WERE CLRED INTO POS ON RWY 25R. AFTER WE TOOK THE RWY, THE TWR INFORMED US THAT WE WOULD BE HOLDING FIX FOR SEVERAL MINS DUE TO DEPS ON RWY 19. I WAS NOT CONCERNED SINCE I KNEW THAT ARRS WERE GOING TO RWY 25L AND THE RWYS 19'S. THE TWR FREQ WAS VERY BUSY AND I THOUGHT I HEARD SOMEONE CHK IN WITH THE TWR ON A PRACTICE APCH. I MISSED THE RWY THAT THEY WERE FLYING THE APCH TO AND I ASKED MY FO IF HE HEARD WHICH RWY THEY WERE FLYING THE PRACTICE APCH TO. HE ALSO HAD NOT HEARD WHICH RWY HE WAS GOING TO. I TRIED TO BREAK IN ON THE FREQ TO ASK WHERE THIS ACFT WAS BUT WAS UNSUCCESSFUL. ABOUT THIS TIME AN ACFT SHOWED UP ON TCASII DIRECTLY BEHIND US, 300 FT ABOVE AND DSNDING. I WAS ABOUT READY TO TAXI CLR OF THE RWY WHEN I HEARD AND COULD FEEL THE VIBRATION OF THE TWIN OTTER AS HE WENT MISSED APCH OVER THE TOP AND JUST TO THE L OF MY ACFT. WHEN HE CLRED, TWR CLRED US FOR TKOF AND DIDN'T SAY A WORD ABOUT THE TWIN OTTER. WE GOT THE INFO ON HIM AFTER TKOF.
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.