Fgt's X had less than standard separation from small aircraft Y. System error. Near midair collision...

Attributes
ACN	151204
Time
Date	199007
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : baf
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : baf
Operator	other
Make Model Name	Fighter
Flight Phase	climbout : takeoff
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	landing other other
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	151204
Person 2
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : military
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Runway 20 and 15 in use, heavy traffic with 4-5 aircraft in the runway 15 traffic pattern and numerous arrs and departure. There appeared to be less than standard separation between a flight of 4 fgt's and small aircraft Y over the runway intersection when the small aircraft Y had been sent around from a touch and go, fgt's X, a flight of 4 fgt's called ready for IFR departure on runway 20 with 10 seconds spacing between pairs. Fgt's X was taxied into position to hold for touch and go traffic on runway 15. At this time, small aircraft Y was midfield downwind runway 15. I informed small aircraft Y that there would be a flight of 4 fgt's departing runway 20 prior to his touch and go, and cleared for touch and go. When small aircraft Y turned base I instructed him to widen his base to the right because the fgt's were about to be cleared for takeoff. I then issued departure instructions, and cleared fgt's X for takeoff and had him change to departure. When small aircraft Y turned final, I instructed him to go around. Small aircraft Y appeared to cross runway 20 at or above 200' just prior to the first pair of fgt's entering the intersection. The first pair of fgt's appeared to delay their takeoff rotation to avoid the small aircraft Y.

Original NASA ASRS Text

Title: FGT'S X HAD LESS THAN STANDARD SEPARATION FROM SMA Y. SYSTEM ERROR. NMAC.

Narrative: RWY 20 AND 15 IN USE, HVY TFC WITH 4-5 ACFT IN THE RWY 15 TFC PATTERN AND NUMEROUS ARRS AND DEP. THERE APPEARED TO BE LTSS BTWN A FLT OF 4 FGT'S AND SMA Y OVER THE RWY INTXN WHEN THE SMA Y HAD BEEN SENT AROUND FROM A TOUCH AND GO, FGT'S X, A FLT OF 4 FGT'S CALLED READY FOR IFR DEP ON RWY 20 WITH 10 SECS SPACING BTWN PAIRS. FGT'S X WAS TAXIED INTO POS TO HOLD FOR TOUCH AND GO TFC ON RWY 15. AT THIS TIME, SMA Y WAS MIDFIELD DOWNWIND RWY 15. I INFORMED SMA Y THAT THERE WOULD BE A FLT OF 4 FGT'S DEPARTING RWY 20 PRIOR TO HIS TOUCH AND GO, AND CLRED FOR TOUCH AND GO. WHEN SMA Y TURNED BASE I INSTRUCTED HIM TO WIDEN HIS BASE TO THE R BECAUSE THE FGT'S WERE ABOUT TO BE CLRED FOR TKOF. I THEN ISSUED DEP INSTRUCTIONS, AND CLRED FGT'S X FOR TKOF AND HAD HIM CHANGE TO DEP. WHEN SMA Y TURNED FINAL, I INSTRUCTED HIM TO GO AROUND. SMA Y APPEARED TO CROSS RWY 20 AT OR ABOVE 200' JUST PRIOR TO THE FIRST PAIR OF FGT'S ENTERING THE INTXN. THE FIRST PAIR OF FGT'S APPEARED TO DELAY THEIR TKOF ROTATION TO AVOID THE SMA Y.

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.