Spc aircraft slowed on final approach resulting in an overtake by the second aircraft.

Attributes
ACN	127328
Time
Date	198910
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : san airport : nkx
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : san
Operator	other
Make Model Name	Experimental
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military Trainer
Flight Phase	descent : approach descent other
Route In Use	approach : visual arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	182732
Person 2
Affiliation	government : faa
Function	oversight : coordinator
Qualification	controller : radar
ASRS Report	127329
Events
Anomaly	non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

Spc X was on a hi-TACAN to miramar NAS. MTR Y was north of the field at 5000' requesting a visual. After traffic conflicts were resolved with MTR Y he was cleared for visual approach. Spc X was on a 4-5 mi final. MTR Y on approach now about 8 northeast of miramar at least 5 mi in trail of spc X. Traffic was not given as it was initially thought not to be needed. As it turned out spc X slowed to 100 KTS and MTR Y descended rapidly and airspeed increased to 150-160 KTS. When it became evident MTR Y would encroach on spc X, we advised the tower at miramar to issue traffic so the aircraft could follow him on a visual. We had sent MTR Y to the tower at least 2 minutes prior to this. The tower then advised they were not talking to MTR Y. We also attempted to contact MTR Y. Within seconds separation apparently was lost with MTR Y finally reaching the tower with spc X in sight.

Original NASA ASRS Text

Title: SPC ACFT SLOWED ON FINAL APCH RESULTING IN AN OVERTAKE BY THE SECOND ACFT.

Narrative: SPC X WAS ON A HI-TACAN TO MIRAMAR NAS. MTR Y WAS N OF THE FIELD AT 5000' REQUESTING A VISUAL. AFTER TFC CONFLICTS WERE RESOLVED WITH MTR Y HE WAS CLRED FOR VISUAL APCH. SPC X WAS ON A 4-5 MI FINAL. MTR Y ON APCH NOW ABOUT 8 NE OF MIRAMAR AT LEAST 5 MI IN TRAIL OF SPC X. TFC WAS NOT GIVEN AS IT WAS INITIALLY THOUGHT NOT TO BE NEEDED. AS IT TURNED OUT SPC X SLOWED TO 100 KTS AND MTR Y DESCENDED RAPIDLY AND AIRSPEED INCREASED TO 150-160 KTS. WHEN IT BECAME EVIDENT MTR Y WOULD ENCROACH ON SPC X, WE ADVISED THE TWR AT MIRAMAR TO ISSUE TFC SO THE ACFT COULD FOLLOW HIM ON A VISUAL. WE HAD SENT MTR Y TO THE TWR AT LEAST 2 MINUTES PRIOR TO THIS. THE TWR THEN ADVISED THEY WERE NOT TALKING TO MTR Y. WE ALSO ATTEMPTED TO CONTACT MTR Y. WITHIN SECONDS SEPARATION APPARENTLY WAS LOST WITH MTR Y FINALLY REACHING THE TWR WITH SPC X IN SIGHT.

Data retrieved from NASA's ASRS site as of August 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.