Large transport aircraft departed gjt sbound and a flight of 2 military fighters cleared for low app...

Attributes
ACN	406991
Time
Date	199807
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jnc airport : gjt
State Reference	CO
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gjt tracon : chs
Operator	other
Make Model Name	Hornet (F-18)
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other descent : approach
Route In Use	arrival other departure other
Flight Plan	IFR
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	other : unknown
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
ASRS Report	406991
Person 2
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : military pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Military #1, 2 F18's, IFR to nkx departing runway 29. Requested a low approach prior to departing for nkx. Aircraft #1, C172, VFR northbound departing runway 11. Aircraft #1 was cleared for takeoff on runway 11 and was instructed to proceed right turn wbound to avoid the F18's departing runway 29 with right closed traffic for noise abatement anticipating on aircraft #1 turning northbound as soon as military #1 turned crossing wind. After military #1 departed runway 29 aircraft #1 target disappeared from the scope. I asked aircraft #1 his position and he stated he was 7 mi southwest. Immediately after aircraft #1 stated his position the target appeared on the scope again and instructed the pilot proceed northbound. The target was observed to be only 2 1/2 mi south of the airport. I turned to observe military #1 flight and it appeared aircraft was rapidly increasing speed on the downwind leg. I attempted to visually observe aircraft #1 without success. I turned back to observe military #1 flight and noticed both F18's turning base with the first F18 almost over the threshold of runway 29 at about 500 ft AGL. At that time I noticed the target trails to be again 1/2 mi apart estimated speed 450 KTS, and realized there would be a conflict if I allowed aircraft #1 to continue northbound. I instructed aircraft #1 to turn east to avoid the F18's.

Original NASA ASRS Text

Title: LGT ACFT DEPARTED GJT SBOUND AND A FLT OF 2 MIL FIGHTERS CLRED FOR LOW APCH NBOUND, REMAIN CLOSE IN R PATTERN, THEN DEPART W TO NKX.

Narrative: MIL #1, 2 F18'S, IFR TO NKX DEPARTING RWY 29. REQUESTED A LOW APCH PRIOR TO DEPARTING FOR NKX. ACFT #1, C172, VFR NBOUND DEPARTING RWY 11. ACFT #1 WAS CLRED FOR TKOF ON RWY 11 AND WAS INSTRUCTED TO PROCEED R TURN WBOUND TO AVOID THE F18'S DEPARTING RWY 29 WITH R CLOSED TFC FOR NOISE ABATEMENT ANTICIPATING ON ACFT #1 TURNING NBOUND AS SOON AS MIL #1 TURNED XING WIND. AFTER MIL #1 DEPARTED RWY 29 ACFT #1 TARGET DISAPPEARED FROM THE SCOPE. I ASKED ACFT #1 HIS POS AND HE STATED HE WAS 7 MI SW. IMMEDIATELY AFTER ACFT #1 STATED HIS POS THE TARGET APPEARED ON THE SCOPE AGAIN AND INSTRUCTED THE PLT PROCEED NBOUND. THE TARGET WAS OBSERVED TO BE ONLY 2 1/2 MI S OF THE ARPT. I TURNED TO OBSERVE MIL #1 FLT AND IT APPEARED ACFT WAS RAPIDLY INCREASING SPD ON THE DOWNWIND LEG. I ATTEMPTED TO VISUALLY OBSERVE ACFT #1 WITHOUT SUCCESS. I TURNED BACK TO OBSERVE MIL #1 FLT AND NOTICED BOTH F18'S TURNING BASE WITH THE FIRST F18 ALMOST OVER THE THRESHOLD OF RWY 29 AT ABOUT 500 FT AGL. AT THAT TIME I NOTICED THE TARGET TRAILS TO BE AGAIN 1/2 MI APART ESTIMATED SPD 450 KTS, AND REALIZED THERE WOULD BE A CONFLICT IF I ALLOWED ACFT #1 TO CONTINUE NBOUND. I INSTRUCTED ACFT #1 TO TURN E TO AVOID THE F18'S.

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.

Large transport aircraft departed gjt sbound and a flight of 2 military fighters cleared for low approach northbound, remain close in right pattern, then depart west to nkx.