<< >> NASA ASRS Report 350315, October 1996

Tower controller cleared a C172 into position and hold at intersection A2 while a TG7 (military trainer) was touching down on the runway near intersection A1. Controller caught his error and was able to get the TG7 to stop short of intersection A2 and clear the C172 for takeoff.

Attributes
ACN	350315
Time
Date	199610
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cos
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Military Trainer
Flight Phase	landing other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground : holding ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller non radar : 6
ASRS Report	350315
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
Events
Anomaly	conflict : ground critical non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The TG7 was cleared for a touch-and-go on runway 17R. C172 called ready for departure at intersection A2 and was instructed to hold short of the runway for landing traffic. Once the TG7 was past intersection A1, I instructed C172 to 'taxi into position and hold,' having forgotten that he was at intersection A2. The cessna went into position on the rwt at intersection A2 with the TG7 on the runway. Once I realized the error the TG7 was instructed to hold on the runway and the cessna was cleared for takeoff. Once standard separation existed, the TG7 was cleared for takeoff. There were numerous other aircraft on the frequency at the time, many of which had to be issued instructions more than once, which led to higher workload and confusion. I simply forgot that the aircraft was at another intersection, and don't know what could have been done differently to have prevented the occurrence.

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Original NASA ASRS Text

Title: TWR CTLR CLRED A C172 INTO POS AND HOLD AT INTXN A2 WHILE A TG7 (MIL TRAINER) WAS TOUCHING DOWN ON THE RWY NEAR INTXN A1. CTLR CAUGHT HIS ERROR AND WAS ABLE TO GET THE TG7 TO STOP SHORT OF INTXN A2 AND CLR THE C172 FOR TKOF.

Narrative: THE TG7 WAS CLRED FOR A TOUCH-AND-GO ON RWY 17R. C172 CALLED READY FOR DEP AT INTXN A2 AND WAS INSTRUCTED TO HOLD SHORT OF THE RWY FOR LNDG TFC. ONCE THE TG7 WAS PAST INTXN A1, I INSTRUCTED C172 TO 'TAXI INTO POS AND HOLD,' HAVING FORGOTTEN THAT HE WAS AT INTXN A2. THE CESSNA WENT INTO POS ON THE RWT AT INTXN A2 WITH THE TG7 ON THE RWY. ONCE I REALIZED THE ERROR THE TG7 WAS INSTRUCTED TO HOLD ON THE RWY AND THE CESSNA WAS CLRED FOR TKOF. ONCE STANDARD SEPARATION EXISTED, THE TG7 WAS CLRED FOR TKOF. THERE WERE NUMEROUS OTHER ACFT ON THE FREQ AT THE TIME, MANY OF WHICH HAD TO BE ISSUED INSTRUCTIONS MORE THAN ONCE, WHICH LED TO HIGHER WORKLOAD AND CONFUSION. I SIMPLY FORGOT THAT THE ACFT WAS AT ANOTHER INTXN, AND DON'T KNOW WHAT COULD HAVE BEEN DONE DIFFERENTLY TO HAVE PREVENTED THE OCCURRENCE.

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.