Small transport made takeoff while reporter in light transport was back tracking on the same runway.

Attributes
ACN	84505
Time
Date	198803
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : rsd
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dtw
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	ground other : taxi
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Transport
Flight Phase	climbout : takeoff ground other : taxi
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 9500 flight time type : 1400
ASRS Report	84505
Person 2
Function	flight crew : single pilot
Events
Anomaly	conflict : ground critical incursion : runway non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted none taken : unable
Consequence	Other
Miss Distance	horizontal : 25 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were departing from rocksound airport in the bahamas with 3 passenger for a flight back to teterboro, nj. After boarding our passenger and starting engines we advised rocksound unicom that we were taxiing out for departure. Back taxiing on the active runway would be required, unicom advised us that small transport had just departed the ramp area, taxiing for the departure runway, and that there was an aircraft 10 mi north, inbound. We advised that we had the small transport in sight perhaps 2000' in front of us and continued taxiing for our departure behind the small transport. As we taxied out onto the runway, we advised unicom that we were backtaxiing on the active for departure. (We followed the small transport for several thousand ft.) while we were still about 1500' from the end of the runway, we saw the small transport line up in position with his lights on and start his takeoff roll. He never stated his intention to do so on unicom. We immediately moved as far to the right side of the runway as we could. The small transport lifted off at a point abeam our position with maybe 20-30' wingtip clearance. Needless to say, the small transport had our undivided attention. We have been operating out of this airport for more than 7 yrs now and have many times shared the runway with another aircraft while backtaxiing for takeoff. This, however, is the first time I have ever had anyone takeoff while we were still in front of them.

Original NASA ASRS Text

Title: SMT MADE TKOF WHILE REPORTER IN LTT WAS BACK TRACKING ON THE SAME RWY.

Narrative: WE WERE DEPARTING FROM ROCKSOUND ARPT IN THE BAHAMAS WITH 3 PAX FOR A FLT BACK TO TETERBORO, NJ. AFTER BOARDING OUR PAX AND STARTING ENGS WE ADVISED ROCKSOUND UNICOM THAT WE WERE TAXIING OUT FOR DEP. BACK TAXIING ON THE ACTIVE RWY WOULD BE REQUIRED, UNICOM ADVISED US THAT SMT HAD JUST DEPARTED THE RAMP AREA, TAXIING FOR THE DEP RWY, AND THAT THERE WAS AN ACFT 10 MI N, INBND. WE ADVISED THAT WE HAD THE SMT IN SIGHT PERHAPS 2000' IN FRONT OF US AND CONTINUED TAXIING FOR OUR DEP BEHIND THE SMT. AS WE TAXIED OUT ONTO THE RWY, WE ADVISED UNICOM THAT WE WERE BACKTAXIING ON THE ACTIVE FOR DEP. (WE FOLLOWED THE SMT FOR SEVERAL THOUSAND FT.) WHILE WE WERE STILL ABOUT 1500' FROM THE END OF THE RWY, WE SAW THE SMT LINE UP IN POS WITH HIS LIGHTS ON AND START HIS TKOF ROLL. HE NEVER STATED HIS INTENTION TO DO SO ON UNICOM. WE IMMEDIATELY MOVED AS FAR TO THE RIGHT SIDE OF THE RWY AS WE COULD. THE SMT LIFTED OFF AT A POINT ABEAM OUR POS WITH MAYBE 20-30' WINGTIP CLRNC. NEEDLESS TO SAY, THE SMT HAD OUR UNDIVIDED ATTN. WE HAVE BEEN OPERATING OUT OF THIS ARPT FOR MORE THAN 7 YRS NOW AND HAVE MANY TIMES SHARED THE RWY WITH ANOTHER ACFT WHILE BACKTAXIING FOR TKOF. THIS, HOWEVER, IS THE FIRST TIME I HAVE EVER HAD ANYONE TKOF WHILE WE WERE STILL IN FRONT OF THEM.

Data retrieved from NASA's ASRS site as of August 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.