A C172 crossed the active runway without a clearance at dab.

Attributes
ACN	434135
Time
Date	199904
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dab.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dab.tower
Operator	general aviation : instructional
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Flight Plan	VFR
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : commercial pilot : cfi pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 160 flight time total : 2000 flight time type : 100
ASRS Report	434135
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 30 flight time total : 315 flight time type : 24
ASRS Report	434184
Events
Anomaly	incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Dab ground control was extremely busy and there was heavy frequency congestion. I was given the following instructions while #1 holding short of runway 25R on runway 16 awaiting taxi instructions to runway 25L. My aircraft follow cessna (which had just crossed runway 25R from in front of me) continue to hold short runway 25R which I and my CFI student had never heard. I learned this after listening to the tape at the dab ATC facility. Having been told to follow cessna and continue when I was at the hold short of runway 25R line, I looked and cleared traffic left and right and continued. I saw no traffic in either direction. I also queried my CFI student for confirmation on clearance to cross runway and he confirmed that we were cleared to cross runway. In hindsight, I should have doublechked with ground control to confirm, even though the frequency was very congested. In addition, I feel ATC should not give contradictory sounding clrncs, ie, while at hold short. In discussing this with ATC, the controller or his supervisor admitted he had thought I was #2 at hold short line and not #1 when he issued my instructions.

Original NASA ASRS Text

Title: A C172 CROSSED THE ACTIVE RWY WITHOUT A CLRNC AT DAB.

Narrative: DAB GND CTL WAS EXTREMELY BUSY AND THERE WAS HVY FREQ CONGESTION. I WAS GIVEN THE FOLLOWING INSTRUCTIONS WHILE #1 HOLDING SHORT OF RWY 25R ON RWY 16 AWAITING TAXI INSTRUCTIONS TO RWY 25L. MY ACFT FOLLOW CESSNA (WHICH HAD JUST CROSSED RWY 25R FROM IN FRONT OF ME) CONTINUE TO HOLD SHORT RWY 25R WHICH I AND MY CFI STUDENT HAD NEVER HEARD. I LEARNED THIS AFTER LISTENING TO THE TAPE AT THE DAB ATC FACILITY. HAVING BEEN TOLD TO FOLLOW CESSNA AND CONTINUE WHEN I WAS AT THE HOLD SHORT OF RWY 25R LINE, I LOOKED AND CLRED TFC L AND R AND CONTINUED. I SAW NO TFC IN EITHER DIRECTION. I ALSO QUERIED MY CFI STUDENT FOR CONFIRMATION ON CLRNC TO CROSS RWY AND HE CONFIRMED THAT WE WERE CLRED TO CROSS RWY. IN HINDSIGHT, I SHOULD HAVE DOUBLECHKED WITH GND CTL TO CONFIRM, EVEN THOUGH THE FREQ WAS VERY CONGESTED. IN ADDITION, I FEEL ATC SHOULD NOT GIVE CONTRADICTORY SOUNDING CLRNCS, IE, WHILE AT HOLD SHORT. IN DISCUSSING THIS WITH ATC, THE CTLR OR HIS SUPVR ADMITTED HE HAD THOUGHT I WAS #2 AT HOLD SHORT LINE AND NOT #1 WHEN HE ISSUED MY INSTRUCTIONS.

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.