A B737 flight crew heard and read back tiph. After noticing an aircraft on runway, the flight crew asked iah tower for confirmation and find out clearance was not for them.

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Attributes
ACN	622255
Time
Date	200305
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : iah.airport
State Reference	TX
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : holding ground : taxi
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : iah.tower
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	ground : position and hold ground : takeoff roll
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 5000
ASRS Report	622255
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : far non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

We were #1 holding short of runway 15L, and we both heard tower clear us into position and hold. Her transmission was slightly garbled, so first officer read back clearance slowly and clearly. Tower did not disagree with readback, so we understood that we were cleared into position. After crossing hold line about 20 ft, we noticed the aircraft ahead of us had not begun takeoff, so we stopped and asked tower if we were cleared into position. She said: negative, hold your position. About 1 min later, we were cleared into position without further problem.

Original NASA ASRS Text

Title: A B737 FLT CREW HEARD AND READ BACK TIPH. AFTER NOTICING AN ACFT ON RWY, THE FLT CREW ASKED IAH TWR FOR CONFIRMATION AND FIND OUT CLRNC WAS NOT FOR THEM.

Narrative: WE WERE #1 HOLDING SHORT OF RWY 15L, AND WE BOTH HEARD TWR CLR US INTO POS AND HOLD. HER XMISSION WAS SLIGHTLY GARBLED, SO FO READ BACK CLRNC SLOWLY AND CLRLY. TWR DID NOT DISAGREE WITH READBACK, SO WE UNDERSTOOD THAT WE WERE CLRED INTO POS. AFTER XING HOLD LINE ABOUT 20 FT, WE NOTICED THE ACFT AHEAD OF US HAD NOT BEGUN TKOF, SO WE STOPPED AND ASKED TWR IF WE WERE CLRED INTO POS. SHE SAID: NEGATIVE, HOLD YOUR POS. ABOUT 1 MIN LATER, WE WERE CLRED INTO POS WITHOUT FURTHER PROB.

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.