B737-300 aircraft flight crew holding short of runway thought they were cleared into position and hold which they read back and commenced taxiing onto runway. Tower controller didn't respond to readback, but flight crew heard another aircraft being cleared for takeoff when they reminded tower they were on the runway. Controller had them clear the runway.

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Attributes
ACN	385550
Time
Date	199711
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 3500
ASRS Report	385550
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 125
ASRS Report	385543
Events
Anomaly	incursion : runway other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We were holding short of runway 34R at sea. We thought we were cleared into position and hold runway 34R. First officer read back our flight number and repeated 'position and hold runway 34R.' shortly thereafter the tower was clearing a commuter type air carrier for takeoff runway 34R. No response from commuter airplane so my first officer told the tower we were in position (flight number) and were cleared on runway previously. He told us to taxi off the runway and stated we were not cleared on the runway.

Original NASA ASRS Text

Title: B737-300 ACFT FLC HOLDING SHORT OF RWY THOUGHT THEY WERE CLRED INTO POS AND HOLD WHICH THEY READ BACK AND COMMENCED TAXIING ONTO RWY. TWR CTLR DIDN'T RESPOND TO READBACK, BUT FLC HEARD ANOTHER ACFT BEING CLRED FOR TKOF WHEN THEY REMINDED TWR THEY WERE ON THE RWY. CTLR HAD THEM CLR THE RWY.

Narrative: WE WERE HOLDING SHORT OF RWY 34R AT SEA. WE THOUGHT WE WERE CLRED INTO POS AND HOLD RWY 34R. FO READ BACK OUR FLT NUMBER AND REPEATED 'POS AND HOLD RWY 34R.' SHORTLY THEREAFTER THE TWR WAS CLRING A COMMUTER TYPE ACR FOR TKOF RWY 34R. NO RESPONSE FROM COMMUTER AIRPLANE SO MY FO TOLD THE TWR WE WERE IN POS (FLT NUMBER) AND WERE CLRED ON RWY PREVIOUSLY. HE TOLD US TO TAXI OFF THE RWY AND STATED WE WERE NOT CLRED ON THE RWY.

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.