Small aircraft X unauthorized landing caused small aircraft Y to go around and come in close proximity of aircraft to small aircraft X. Pilot deviation. See and avoid concept.

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Attributes
ACN	219408
Time
Date	199208
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dvt
State Reference	AZ
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dvt artcc : zny
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : initial ground other : taxi
Route In Use	approach : visual
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	descent : approach landing : go around
Flight Plan	None
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	219408
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe incursion : landing without clearance non adherence : required legal separation non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Tower just opened. I was working tower, local control. I cleared small aircraft X for takeoff. I previously cleared small aircraft Y to land runway 7R. I looked at runway 7R and observed an small aircraft clearing the active. I took this to be the small aircraft Y I cleared to land. It was not. Another small aircraft Z, which did not have transponder set to 7600, landed without communicating. This caused small aircraft Y to go around. Small aircraft Y came in close proximity to small aircraft X. The failure of small aircraft Z pilot to communicate to ATC or advise intentions on CTAF along with his failure to have his transponder on and on 7600 caused an unsafe condition. The pilot also failed to follow lost communication procedures.

Original NASA ASRS Text

Title: SMA X UNAUTHORIZED LNDG CAUSED SMA Y TO GAR AND COME IN CLOSE PROX OF ACFT TO SMA X. PLTDEV. SEE AND AVOID CONCEPT.

Narrative: TWR JUST OPENED. I WAS WORKING TWR, LCL CTL. I CLRED SMA X FOR TKOF. I PREVIOUSLY CLRED SMA Y TO LAND RWY 7R. I LOOKED AT RWY 7R AND OBSERVED AN SMA CLRING THE ACTIVE. I TOOK THIS TO BE THE SMA Y I CLRED TO LAND. IT WAS NOT. ANOTHER SMA Z, WHICH DID NOT HAVE TRANSPONDER SET TO 7600, LANDED WITHOUT COMMUNICATING. THIS CAUSED SMA Y TO GAR. SMA Y CAME IN CLOSE PROX TO SMA X. THE FAILURE OF SMA Z PLT TO COMMUNICATE TO ATC OR ADVISE INTENTIONS ON CTAF ALONG WITH HIS FAILURE TO HAVE HIS TRANSPONDER ON AND ON 7600 CAUSED AN UNSAFE CONDITION. THE PLT ALSO FAILED TO FOLLOW LOST COM PROCS.

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.