Small aircraft Y overtake of small aircraft X on final approach. Non adherence to ATC clearance. Near midair collision. Pilot deviation.

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Attributes
ACN	198177
Time
Date	199201
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pao
State Reference	CA
Altitude	msl bound lower : 600 msl bound upper : 650
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pao
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller non radar : 1
ASRS Report	198177
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : nmac non adherence : far non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Operational Deviation Pilot Deviation

Narrative:

I had issued a landing clearance to small aircraft X and I then issued a landing clearance to small aircraft Y to follow small aircraft X. Small aircraft Y overtook small aircraft X and flew over the top of him at about 50 ft. I sent small aircraft Y around and small aircraft X landed.

Original NASA ASRS Text

Title: SMA Y OVERTAKE OF SMA X ON FINAL APCH. NON ADHERENCE TO ATC CLRNC. NMAC. PLTDEV.

Narrative: I HAD ISSUED A LNDG CLRNC TO SMA X AND I THEN ISSUED A LNDG CLRNC TO SMA Y TO FOLLOW SMA X. SMA Y OVERTOOK SMA X AND FLEW OVER THE TOP OF HIM AT ABOUT 50 FT. I SENT SMA Y AROUND AND SMA X LANDED.

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.