Atx Y had ground conflict with air carrier X. See and avoid concept.

Attributes
ACN	252394
Time
Date	199309
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pnf
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : ground controller : local
Qualification	controller : non radar
ASRS Report	252394
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

I was working ground control and local control combined at the time of occurrence. Atx Y was taxiing across runway 14 as instructed by me. Air carrier X was taxiing on the parallel taxiway a, to the ramp as instructed by me. Neither aircraft was issued hold short instructions of the other one's taxiway. As I was busy with other duties I was not concentrating on this potential conflict and assumed the aircraft saw each other. Apparently the pilot of atx Y did not see the air carrier X on the taxiway ahead until he was almost at the intersection of the 2 txwys. I reviewed this event and feel that as a 'controller' I must issue explicit hold instructions, and not assume that the aircraft will see each other. No collision occurred but by the tone of voice of the pilot of atx Y it was apparent that he was quite startled.

Original NASA ASRS Text

Title: ATX Y HAD GND CONFLICT WITH ACR X. SEE AND AVOID CONCEPT.

Narrative: I WAS WORKING GND CTL AND LCL CTL COMBINED AT THE TIME OF OCCURRENCE. ATX Y WAS TAXIING ACROSS RWY 14 AS INSTRUCTED BY ME. ACR X WAS TAXIING ON THE PARALLEL TXWY A, TO THE RAMP AS INSTRUCTED BY ME. NEITHER ACFT WAS ISSUED HOLD SHORT INSTRUCTIONS OF THE OTHER ONE'S TXWY. AS I WAS BUSY WITH OTHER DUTIES I WAS NOT CONCENTRATING ON THIS POTENTIAL CONFLICT AND ASSUMED THE ACFT SAW EACH OTHER. APPARENTLY THE PLT OF ATX Y DID NOT SEE THE ACR X ON THE TXWY AHEAD UNTIL HE WAS ALMOST AT THE INTXN OF THE 2 TXWYS. I REVIEWED THIS EVENT AND FEEL THAT AS A 'CTLR' I MUST ISSUE EXPLICIT HOLD INSTRUCTIONS, AND NOT ASSUME THAT THE ACFT WILL SEE EACH OTHER. NO COLLISION OCCURRED BUT BY THE TONE OF VOICE OF THE PLT OF ATX Y IT WAS APPARENT THAT HE WAS QUITE STARTLED.

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.