A C337 pilot and CFI perform a runway incursion at ads, tx.

Attributes
ACN	457930
Time
Date	199912
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ads.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Super Skymaster
Operating Under FAR Part	Part 91
Flight Phase	ground : position and hold ground : holding
Flight Plan	IFR
Person 1
Affiliation	other
Function	instruction : trainee
Qualification	pilot : multi engine pilot : private
Experience	flight time last 90 days : 20 flight time total : 300 flight time type : 20
ASRS Report	457930
Person 2
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : atp
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : clearance non adherence : required legal separation non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : separated traffic controller : issued new clearance flight crew : executed go around
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance ATC Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Very busy with 5-6 aircraft holding and 3-4 in pattern. We were first for takeoff. Tower called with what PIC and instructor heard as 'taxi into position and hold' instructions. We were having problems with rear engine distracting us. Tower called a second time and requested readback. Read back as 'taxi into position and hold.' crossed the hold line and tower stated that controller wanted us to 'hold short' for aircraft on final. Tower cleared us for immediate takeoff. While the distraction of the engine problem caused some confusion, tower's request for us to 'read back hold instruction' led us to believe that we had been given a different instruction. Tower had given 'taxi into position and hold' instructions to the 3 previous aircraft, so we expected those instructions. While there was no adverse outcome, the potential for an accident was significant. 1 aircraft was cleared with a taxi into position and hold onto the runway before us. The aircraft on final called tower and verified an aircraft on the runway. When confirmed, the aircraft on final was given go around instructions.

Original NASA ASRS Text

Title: A C337 PLT AND CFI PERFORM A RWY INCURSION AT ADS, TX.

Narrative: VERY BUSY WITH 5-6 ACFT HOLDING AND 3-4 IN PATTERN. WE WERE FIRST FOR TKOF. TWR CALLED WITH WHAT PIC AND INSTRUCTOR HEARD AS 'TAXI INTO POS AND HOLD' INSTRUCTIONS. WE WERE HAVING PROBS WITH REAR ENG DISTRACTING US. TWR CALLED A SECOND TIME AND REQUESTED READBACK. READ BACK AS 'TAXI INTO POS AND HOLD.' CROSSED THE HOLD LINE AND TWR STATED THAT CTLR WANTED US TO 'HOLD SHORT' FOR ACFT ON FINAL. TWR CLRED US FOR IMMEDIATE TKOF. WHILE THE DISTR OF THE ENG PROB CAUSED SOME CONFUSION, TWR'S REQUEST FOR US TO 'READ BACK HOLD INSTRUCTION' LED US TO BELIEVE THAT WE HAD BEEN GIVEN A DIFFERENT INSTRUCTION. TWR HAD GIVEN 'TAXI INTO POS AND HOLD' INSTRUCTIONS TO THE 3 PREVIOUS ACFT, SO WE EXPECTED THOSE INSTRUCTIONS. WHILE THERE WAS NO ADVERSE OUTCOME, THE POTENTIAL FOR AN ACCIDENT WAS SIGNIFICANT. 1 ACFT WAS CLRED WITH A TAXI INTO POS AND HOLD ONTO THE RWY BEFORE US. THE ACFT ON FINAL CALLED TWR AND VERIFIED AN ACFT ON THE RWY. WHEN CONFIRMED, THE ACFT ON FINAL WAS GIVEN GAR 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.