Flight crew of a B757 took off below IFR WX minimums due not observing the minimum takeoff required for that runway. Lack of runway review was caused by last min runway change to recompute the new runway acceptability length for their aircraft weight.

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Attributes
ACN	415535
Time
Date	199809
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pdx
State Reference	OR
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6000 flight time type : 700
ASRS Report	415535
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 1500
ASRS Report	415610
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	Pilot Deviation

Narrative:

On taxi out at pdx we were given a runway change from runway 28R to runway 10L. RVR reported by ground was takeoff 5000 ft, mid 0 ft, rollout 5000 ft. The captain was getting the runway data (first 1000 ft closed) and checking the weights. We were given takeoff clearance before getting to the runway. I felt a little rushed going through the checklist and was thinking landing minimums, not takeoff minimums. We also ACARS'ed dispatch for a takeoff alternate and received a takeoff alternate from dispatch. I didn't realize until we were airborne that we needed 600 ft touchdown zone, 600 ft mid, and 600 ft rollout to takeoff. I feel this happened because we were rushing to take off and didn't stop to think what we needed to take off. Supplemental information from acn 415610: RVR requirements for takeoff from runway 10L at portland are 600 ft touchdown zone, 600 ft mid, and 600 ft rollout. The mid reading was below 600 ft and was controling. I should not have accepted the takeoff clearance.

Original NASA ASRS Text

Title: FLC OF A B757 TOOK OFF BELOW IFR WX MINIMUMS DUE NOT OBSERVING THE MINIMUM TKOF REQUIRED FOR THAT RWY. LACK OF RWY REVIEW WAS CAUSED BY LAST MIN RWY CHANGE TO RECOMPUTE THE NEW RWY ACCEPTABILITY LENGTH FOR THEIR ACFT WT.

Narrative: ON TAXI OUT AT PDX WE WERE GIVEN A RWY CHANGE FROM RWY 28R TO RWY 10L. RVR RPTED BY GND WAS TKOF 5000 FT, MID 0 FT, ROLLOUT 5000 FT. THE CAPT WAS GETTING THE RWY DATA (FIRST 1000 FT CLOSED) AND CHKING THE WTS. WE WERE GIVEN TKOF CLRNC BEFORE GETTING TO THE RWY. I FELT A LITTLE RUSHED GOING THROUGH THE CHKLIST AND WAS THINKING LNDG MINIMUMS, NOT TKOF MINIMUMS. WE ALSO ACARS'ED DISPATCH FOR A TKOF ALTERNATE AND RECEIVED A TKOF ALTERNATE FROM DISPATCH. I DIDN'T REALIZE UNTIL WE WERE AIRBORNE THAT WE NEEDED 600 FT TOUCHDOWN ZONE, 600 FT MID, AND 600 FT ROLLOUT TO TKOF. I FEEL THIS HAPPENED BECAUSE WE WERE RUSHING TO TAKE OFF AND DIDN'T STOP TO THINK WHAT WE NEEDED TO TAKE OFF. SUPPLEMENTAL INFO FROM ACN 415610: RVR REQUIREMENTS FOR TKOF FROM RWY 10L AT PORTLAND ARE 600 FT TOUCHDOWN ZONE, 600 FT MID, AND 600 FT ROLLOUT. THE MID READING WAS BELOW 600 FT AND WAS CTLING. I SHOULD NOT HAVE ACCEPTED THE TKOF CLRNC.

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.