Loss of separation when reporter's aircraft crossed runway 16L while other air carrier was on takeoff roll on runway 16L. Flight crew had been told to hold short of runway 16L but read back cleared to cross.

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Attributes
ACN	388872
Time
Date	199712
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	climbout : takeoff other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 80 flight time total : 4600 flight time type : 2000
ASRS Report	388872
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 3700 flight time type : 1200
ASRS Report	388880
Events
Anomaly	conflict : ground less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

On landing rollout runway 16R at sea-tac, tower cleared us to hold short of runway 16L. We understood tower to say clear to cross runway 16L. We read back: 'roger, clear to cross runway 16L.' tower did not respond or correct our transmission. (Tower tape verifies these xmissions to be accurate.) we crossed runway 16L safely, but aircraft on runway 16L was told to abort takeoff. Landing rollout is a busy time. Controllers must listen to pilot readbacks closely. Supplemental information from acn 388880: the captain looked up runway 16L and saw an aircraft at the end of the runway that appeared to be positioned and holding for us to cross. We proceeded to cross the runway. We were then told that our instructions had been to hold short of runway 16L. The aircraft on the runway had been cleared for takeoff. We cleared the runway and were told to phone tower after we blocked in. It was a miscom that was worsened due to our receiving the information just as we were passing control of the aircraft.

Original NASA ASRS Text

Title: LOSS OF SEPARATION WHEN RPTR'S ACFT CROSSED RWY 16L WHILE OTHER ACR WAS ON TKOF ROLL ON RWY 16L. FLC HAD BEEN TOLD TO HOLD SHORT OF RWY 16L BUT READ BACK CLRED TO CROSS.

Narrative: ON LNDG ROLLOUT RWY 16R AT SEA-TAC, TWR CLRED US TO HOLD SHORT OF RWY 16L. WE UNDERSTOOD TWR TO SAY CLR TO CROSS RWY 16L. WE READ BACK: 'ROGER, CLR TO CROSS RWY 16L.' TWR DID NOT RESPOND OR CORRECT OUR XMISSION. (TWR TAPE VERIFIES THESE XMISSIONS TO BE ACCURATE.) WE CROSSED RWY 16L SAFELY, BUT ACFT ON RWY 16L WAS TOLD TO ABORT TKOF. LNDG ROLLOUT IS A BUSY TIME. CTLRS MUST LISTEN TO PLT READBACKS CLOSELY. SUPPLEMENTAL INFO FROM ACN 388880: THE CAPT LOOKED UP RWY 16L AND SAW AN ACFT AT THE END OF THE RWY THAT APPEARED TO BE POSITIONED AND HOLDING FOR US TO CROSS. WE PROCEEDED TO CROSS THE RWY. WE WERE THEN TOLD THAT OUR INSTRUCTIONS HAD BEEN TO HOLD SHORT OF RWY 16L. THE ACFT ON THE RWY HAD BEEN CLRED FOR TKOF. WE CLRED THE RWY AND WERE TOLD TO PHONE TWR AFTER WE BLOCKED IN. IT WAS A MISCOM THAT WAS WORSENED DUE TO OUR RECEIVING THE INFO JUST AS WE WERE PASSING CTL OF THE ACFT.

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.