Small aircraft taxied into position on runway causing an air carrier to go around.

Attributes
ACN	134688
Time
Date	199001
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	landing : go around
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 15 flight time total : 900 flight time type : 300
ASRS Report	134688
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical incursion : runway non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

My primary student and I had completed our engine runup in the runup area at the end of 19L at dulles airport. I called the tower for takeoff clearance. The tower replied 'taxi into position and hold 19L.' as we were taxiing to the runway I visually cleared the approach end of 19L for landing aircraft and did not see anything. We sat in position for a long time, (more than 1 minute) waiting for takeoff clearance. The next sound we heard was the roar of jet engines as an airliner did a go around. My student and I were scared and confused at this point. We still held position for another 15 seconds until the tower finally instructed us to clear 19L. After 2 or 3 minutes the tower cleared us for takeoff and instructed me to call them upon return. When I called the tower I was told that the clearance they had given me was to 'taxi into position and hold short 19L.' I believe that they should have added 'for landing traffic.' I also do not understand why we were allowed to proceed onto the runway when I repeated the clearance back 'taxi into position and hold 19L for small aircraft X.'

Original NASA ASRS Text

Title: SMA TAXIED INTO POSITION ON RWY CAUSING AN ACR TO GO AROUND.

Narrative: MY PRIMARY STUDENT AND I HAD COMPLETED OUR ENGINE RUNUP IN THE RUNUP AREA AT THE END OF 19L AT DULLES ARPT. I CALLED THE TWR FOR TKOF CLRNC. THE TWR REPLIED 'TAXI INTO POSITION AND HOLD 19L.' AS WE WERE TAXIING TO THE RWY I VISUALLY CLRED THE APCH END OF 19L FOR LNDG ACFT AND DID NOT SEE ANYTHING. WE SAT IN POSITION FOR A LONG TIME, (MORE THAN 1 MINUTE) WAITING FOR TKOF CLRNC. THE NEXT SOUND WE HEARD WAS THE ROAR OF JET ENGINES AS AN AIRLINER DID A GO AROUND. MY STUDENT AND I WERE SCARED AND CONFUSED AT THIS POINT. WE STILL HELD POSITION FOR ANOTHER 15 SECONDS UNTIL THE TWR FINALLY INSTRUCTED US TO CLEAR 19L. AFTER 2 OR 3 MINUTES THE TWR CLRED US FOR TKOF AND INSTRUCTED ME TO CALL THEM UPON RETURN. WHEN I CALLED THE TWR I WAS TOLD THAT THE CLRNC THEY HAD GIVEN ME WAS TO 'TAXI INTO POSITION AND HOLD SHORT 19L.' I BELIEVE THAT THEY SHOULD HAVE ADDED 'FOR LNDG TFC.' I ALSO DO NOT UNDERSTAND WHY WE WERE ALLOWED TO PROCEED ONTO THE RWY WHEN I REPEATED THE CLRNC BACK 'TAXI INTO POSITION AND HOLD 19L FOR SMA X.'

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.