 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Near midair collision. Reporter pilot took off without clearance and conflicted with another aircraft taking off on an intersecting runway. Reporter misunderstood clearance to monitor tower as clearance for takeoff.
| Attributes | |
| ACN | 331990 |
| Time | |
| Date | 199603 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : hou |
| State Reference | TX |
| Altitude | agl bound lower : 300 agl bound upper : 300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : hou tower : tus |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff ground : holding |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 11 flight time total : 1309 flight time type : 519 |
| ASRS Report | 331990 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : nmac incursion : runway non adherence : far non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 700 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
I was on the ground at hou, at FBO which is across from the ramp to runway 35. I called clearance delivery and got a departure clearance which ended with readback correct, contact ground on 121.9. I called ground, and he asked me, speaking very fast (traffic was heavy) if I was ready to go now or did I need to do a run-up. I was sitting almost at the hold line. I told ground I was ready to go and he said ok (still speaking very fast) monitor tower on 118.7. I misunderstood him to mean he wanted me to go now like there was no time to wait. After I've had time to think it over I realize that didn't constitute a clearance to takeoff. As a consequence I had to take evasive action to avoid a student departing on an intersecting runway. I was expecting ground to say contact tower on 118.7, instead he said monitor tower on 118.7 and at a lot of twred airports ground and tower are the same and they use both frequencys for ground and tower.
Original NASA ASRS Text
Title: NMAC. RPTR PLT TOOK OFF WITHOUT CLRNC AND CONFLICTED WITH ANOTHER ACFT TAKING OFF ON AN INTERSECTING RWY. RPTR MISUNDERSTOOD CLRNC TO MONITOR TWR AS CLRNC FOR TKOF.
Narrative: I WAS ON THE GND AT HOU, AT FBO WHICH IS ACROSS FROM THE RAMP TO RWY 35. I CALLED CLRNC DELIVERY AND GOT A DEP CLRNC WHICH ENDED WITH READBACK CORRECT, CONTACT GND ON 121.9. I CALLED GND, AND HE ASKED ME, SPEAKING VERY FAST (TFC WAS HVY) IF I WAS READY TO GO NOW OR DID I NEED TO DO A RUN-UP. I WAS SITTING ALMOST AT THE HOLD LINE. I TOLD GND I WAS READY TO GO AND HE SAID OK (STILL SPEAKING VERY FAST) MONITOR TWR ON 118.7. I MISUNDERSTOOD HIM TO MEAN HE WANTED ME TO GO NOW LIKE THERE WAS NO TIME TO WAIT. AFTER I'VE HAD TIME TO THINK IT OVER I REALIZE THAT DIDN'T CONSTITUTE A CLRNC TO TKOF. AS A CONSEQUENCE I HAD TO TAKE EVASIVE ACTION TO AVOID A STUDENT DEPARTING ON AN INTERSECTING RWY. I WAS EXPECTING GND TO SAY CONTACT TWR ON 118.7, INSTEAD HE SAID MONITOR TWR ON 118.7 AND AT A LOT OF TWRED ARPTS GND AND TWR ARE THE SAME AND THEY USE BOTH FREQS FOR GND AND TWR.
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.