<< >> NASA ASRS Report 178515, May 1991

Small aircraft Y takeoff on occupied runway had less than standard separation from small aircraft X. System error. Pilot deviation.

Attributes
ACN	178515
Time
Date	199105
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : anc
State Reference	AK
Altitude	agl bound lower : 0 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground : holding
Aircraft 2
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : takeoff ground : holding
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	178515
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : ground critical non adherence : published procedure non adherence : required legal separation non adherence : far
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

I taxied 3 aircraft onto runway 14 (position and hold). I mistakenly cleared the middle small aircraft Y for takeoff thinking it was the #1 small aircraft X. Attempts to cancel the takeoff clearance were not acknowledged. Small aircraft Y, #2, departed passing approximately 500' above small aircraft X still holding on the runway. Putting aircraft of the same type, west/O distinguishing markings on the runway at the same time greatly increases the odds of this occurrence and is not something I will do again.

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Original NASA ASRS Text

Title: SMA Y TKOF ON OCCUPIED RWY HAD LESS THAN STANDARD SEPARATION FROM SMA X. SYSTEM ERROR. PLTDEV.

Narrative: I TAXIED 3 ACFT ONTO RWY 14 (POS AND HOLD). I MISTAKENLY CLRED THE MIDDLE SMA Y FOR TKOF THINKING IT WAS THE #1 SMA X. ATTEMPTS TO CANCEL THE TKOF CLRNC WERE NOT ACKNOWLEDGED. SMA Y, #2, DEPARTED PASSING APPROX 500' ABOVE SMA X STILL HOLDING ON THE RWY. PUTTING ACFT OF THE SAME TYPE, W/O DISTINGUISHING MARKINGS ON THE RWY AT THE SAME TIME GREATLY INCREASES THE ODDS OF THIS OCCURRENCE AND IS NOT SOMETHING I WILL DO AGAIN.

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.