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A C172 pilot was issued taxi clearance for intersection takeoff during hot and high humidity conditions. The pilot requested and received permission to use the full length of the runway due to density altitude, but feels that the controller should take density altitude into consideration before clearing aircraft for intersection takeoffs.
| Attributes | |
| ACN | 380450 |
| Time | |
| Date | 199709 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mkc |
| State Reference | MO |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | ground other : taxi |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Experience | controller radar : 10 flight time total : 600 |
| ASRS Report | 380450 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : ground |
| Qualification | controller : radar |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
The ground controller had me taxi to taxiway D at mkc. I asked for full length and he told me to taxi to the approach end of runway 1. The WX was hot with high humidity (95 degrees F -- 70%). The density altitude was 3600 ft. I called the tower later and explained that the takeoff roll was almost 3 times normal with high temperature and humidity. The atm who also was the controller told me that he saw it as a safe operation sending a plane to a 3000 ft intersection. I told him that a student pilot may go there because the tower sent them there and not take into account the density altitude. The atm didn't seem to understand or care about this, only that he could do it.
Original NASA ASRS Text
Title: A C172 PLT WAS ISSUED TAXI CLRNC FOR INTXN TKOF DURING HOT AND HIGH HUMIDITY CONDITIONS. THE PLT REQUESTED AND RECEIVED PERMISSION TO USE THE FULL LENGTH OF THE RWY DUE TO DENSITY ALT, BUT FEELS THAT THE CTLR SHOULD TAKE DENSITY ALT INTO CONSIDERATION BEFORE CLRING ACFT FOR INTXN TKOFS.
Narrative: THE GND CTLR HAD ME TAXI TO TXWY D AT MKC. I ASKED FOR FULL LENGTH AND HE TOLD ME TO TAXI TO THE APCH END OF RWY 1. THE WX WAS HOT WITH HIGH HUMIDITY (95 DEGS F -- 70%). THE DENSITY ALT WAS 3600 FT. I CALLED THE TWR LATER AND EXPLAINED THAT THE TKOF ROLL WAS ALMOST 3 TIMES NORMAL WITH HIGH TEMP AND HUMIDITY. THE ATM WHO ALSO WAS THE CTLR TOLD ME THAT HE SAW IT AS A SAFE OP SENDING A PLANE TO A 3000 FT INTXN. I TOLD HIM THAT A STUDENT PLT MAY GO THERE BECAUSE THE TWR SENT THEM THERE AND NOT TAKE INTO ACCOUNT THE DENSITY ALT. THE ATM DIDN'T SEEM TO UNDERSTAND OR CARE ABOUT THIS, ONLY THAT HE COULD DO IT.
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.