Sav controller observes C172 crossing runway under dpting T34 without authorization.

Attributes
ACN	530481
Time
Date	200111
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sav.airport
State Reference	GA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Aircraft 2
Controlling Facilities	tower : sav.tower
Operator	general aviation : personal
Make Model Name	Mentor (T-34)
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Person 1
Affiliation	government : faa
Function	controller : supervisor controller : local controller : ground
Qualification	controller : non radar
Experience	controller limited radar : 3 controller time certified in position2 : 5 flight time total : 100
ASRS Report	530481
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : far non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 100
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft on ramp on east side of runway 36. Aircraft called for taxi, and was told to taxi to runway 36 via taxiway B (also on east side of runway). Proper taxi route did not involve any runway crossings. Aircraft said 'I may need progressive instructions.' I observed a cessna northbound on the ramp and asked if that was him. He replied that it was. I then told him to taxi behind a sbound piper seminole that was just passing him, 'sbound on bravo.' another aircraft then called for progressive taxi from C1 to the southeast FBO ramp (involving a runway crossing), so I instructed the aircraft to taxi via charlie and hold short of runway 36, which he read back. I looked at that aircraft then, to ensure he was headed in the correct direction. I then looked back to see aircraft one crossing runway 36 in front of aircraft two as aircraft two was departing. At the time, I was working both ground and controller in charge in the tower.

Original NASA ASRS Text

Title: SAV CTLR OBSERVES C172 CROSSING RWY UNDER DPTING T34 WITHOUT AUTHORIZATION.

Narrative: ACFT ON RAMP ON E SIDE OF RWY 36. ACFT CALLED FOR TAXI, AND WAS TOLD TO TAXI TO RWY 36 VIA TXWY B (ALSO ON E SIDE OF RWY). PROPER TAXI ROUTE DID NOT INVOLVE ANY RWY CROSSINGS. ACFT SAID 'I MAY NEED PROGRESSIVE INSTRUCTIONS.' I OBSERVED A CESSNA NBOUND ON THE RAMP AND ASKED IF THAT WAS HIM. HE REPLIED THAT IT WAS. I THEN TOLD HIM TO TAXI BEHIND A SBOUND PIPER SEMINOLE THAT WAS JUST PASSING HIM, 'SBOUND ON BRAVO.' ANOTHER ACFT THEN CALLED FOR PROGRESSIVE TAXI FROM C1 TO THE SE FBO RAMP (INVOLVING A RWY CROSSING), SO I INSTRUCTED THE ACFT TO TAXI VIA CHARLIE AND HOLD SHORT OF RWY 36, WHICH HE READ BACK. I LOOKED AT THAT ACFT THEN, TO ENSURE HE WAS HEADED IN THE CORRECT DIRECTION. I THEN LOOKED BACK TO SEE ACFT ONE CROSSING RWY 36 IN FRONT OF ACFT TWO AS ACFT TWO WAS DEPARTING. AT THE TIME, I WAS WORKING BOTH GND AND CIC IN THE TWR.

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.