Air carrier large transport possibly departs with less than takeoff minima.

Attributes
ACN	132115
Time
Date	198912
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : sea
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tower : lnk
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : takeoff ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial
Experience	flight time last 90 days : 193 flight time total : 2928 flight time type : 749
ASRS Report	132115
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter : weather non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

While taxiing on taxiway a we were given clearance for takeoff on runway 16L with RVR 1600/6000/6000. I confirmed from my 20-9A page we were legal for takeoff. After we taxied onto the runway another RVR may have been given to us. During our takeoff roll the tower called us. The captain replied that we were rolling. After we were safely airborne the captain asked the control tower the reason for the call during takeoff. The tower responded that he wanted to advise us of the changing RVR. We were then told to contact departure control. The crew then discussed whether the RVR for runway 16L may have dropped below takeoff minimums.

Original NASA ASRS Text

Title: ACR LGT POSSIBLY DEPARTS WITH LESS THAN TKOF MINIMA.

Narrative: WHILE TAXIING ON TXWY A WE WERE GIVEN CLRNC FOR TKOF ON RWY 16L WITH RVR 1600/6000/6000. I CONFIRMED FROM MY 20-9A PAGE WE WERE LEGAL FOR TKOF. AFTER WE TAXIED ONTO THE RWY ANOTHER RVR MAY HAVE BEEN GIVEN TO US. DURING OUR TKOF ROLL THE TWR CALLED US. THE CAPT REPLIED THAT WE WERE ROLLING. AFTER WE WERE SAFELY AIRBORNE THE CAPT ASKED THE CTL TWR THE REASON FOR THE CALL DURING TKOF. THE TWR RESPONDED THAT HE WANTED TO ADVISE US OF THE CHANGING RVR. WE WERE THEN TOLD TO CONTACT DEP CTL. THE CREW THEN DISCUSSED WHETHER THE RVR FOR RWY 16L MAY HAVE DROPPED BELOW TKOF MINIMUMS.

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.