PA44 initiates takeoff abort when observing PA30 crossing runway at 2r4 airport.

Attributes
ACN	529924
Time
Date	200111
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : 2r4.airport
State Reference	FL
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	PA-44 Seminole Turbo Seminole
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 1350 flight time type : 300
ASRS Report	529924
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	conflict : ground critical ground encounters other non adherence : published procedure non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : rejected takeoff
Miss Distance	horizontal : 475 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Seminole with student pilot at controls made radio call announcing departure on runway 36 with a left downwind departure to the east (per established local procedures to stay out of class C surface area to the north). Began takeoff roll uneventfully. About 15 KTS below vr (50 KIAS), a twin commanche, taxiing from run-up area to FBO (east side of runway to west side midfield taxiway), began to enter runway. I called out on radio, 'tail number, stop!!' commanche applied more power to try and dart across runway. As I made radio call, student immediately reduce power as I began pulling mixtures and braking. Separation at time of abort was less than 500 ft. Exited the runway, taxi back and departed uneventfully. Commanche pilot claimed to not have heard radio call nor seen seminole on takeoff roll.

Original NASA ASRS Text

Title: PA44 INITIATES TKOF ABORT WHEN OBSERVING PA30 XING RWY AT 2R4 ARPT.

Narrative: SEMINOLE WITH STUDENT PLT AT CTLS MADE RADIO CALL ANNOUNCING DEP ON RWY 36 WITH A L DOWNWIND DEP TO THE E (PER ESTABLISHED LOCAL PROCS TO STAY OUT OF CLASS C SURFACE AREA TO THE N). BEGAN TKOF ROLL UNEVENTFULLY. ABOUT 15 KTS BELOW VR (50 KIAS), A TWIN COMMANCHE, TAXIING FROM RUN-UP AREA TO FBO (E SIDE OF RWY TO W SIDE MIDFIELD TXWY), BEGAN TO ENTER RWY. I CALLED OUT ON RADIO, 'TAIL NUMBER, STOP!!' COMMANCHE APPLIED MORE PWR TO TRY AND DART ACROSS RWY. AS I MADE RADIO CALL, STUDENT IMMEDIATELY REDUCE PWR AS I BEGAN PULLING MIXTURES AND BRAKING. SEPARATION AT TIME OF ABORT WAS LESS THAN 500 FT. EXITED THE RWY, TAXI BACK AND DEPARTED UNEVENTFULLY. COMMANCHE PLT CLAIMED TO NOT HAVE HEARD RADIO CALL NOR SEEN SEMINOLE ON TKOF ROLL.

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.