Incorrect takeoff speeds for weight flap confign. FMC data.

Attributes
ACN	315561
Time
Date	199509
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msp
State Reference	MN
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	Fokker 100
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 : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : flight engineer pilot : cfi pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 1000
ASRS Report	315561
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Received message prior to takeoff to chicago O'hare that flight was overweight for landing at chicago. Maximum takeoff weight was to be 92500 pounds for a maximum landing weight in chicago of no more than 88060 pounds (afm). Loads informed crew that an overweight condition was present and takeoff was delayed. A passenger count was made, and current fuel on board was transmitted to 'loads.' subsequent calculations by 'loads' determined weight to be 92512 pounds, 12 pounds over maximum. A request by loads for an 'extra burn' concurrence from the captain was made. Captain approved 'extra burn' of 12 pounds and FMC load data was sent. (Landing at ord made below maximum landing weight.) I expected 'higher' V1 V2 numbers due to the higher weight and received the 'FMC data.' the 'numbers' were higher, data was reviewed, and takeoff was made. However, subsequent checks by crew found that speeds were '5 KTS' too high for weight and flap confign. Although conservative in nature, I should have closely checked FMC data.

Original NASA ASRS Text

Title: INCORRECT TKOF SPDS FOR WT FLAP CONFIGN. FMC DATA.

Narrative: RECEIVED MESSAGE PRIOR TO TKOF TO CHICAGO O'HARE THAT FLT WAS OVERWT FOR LNDG AT CHICAGO. MAX TKOF WT WAS TO BE 92500 LBS FOR A MAX LNDG WT IN CHICAGO OF NO MORE THAN 88060 LBS (AFM). LOADS INFORMED CREW THAT AN OVERWT CONDITION WAS PRESENT AND TKOF WAS DELAYED. A PAX COUNT WAS MADE, AND CURRENT FUEL ON BOARD WAS XMITTED TO 'LOADS.' SUBSEQUENT CALCULATIONS BY 'LOADS' DETERMINED WT TO BE 92512 LBS, 12 LBS OVER MAX. A REQUEST BY LOADS FOR AN 'EXTRA BURN' CONCURRENCE FROM THE CAPT WAS MADE. CAPT APPROVED 'EXTRA BURN' OF 12 LBS AND FMC LOAD DATA WAS SENT. (LNDG AT ORD MADE BELOW MAX LNDG WT.) I EXPECTED 'HIGHER' V1 V2 NUMBERS DUE TO THE HIGHER WT AND RECEIVED THE 'FMC DATA.' THE 'NUMBERS' WERE HIGHER, DATA WAS REVIEWED, AND TKOF WAS MADE. HOWEVER, SUBSEQUENT CHKS BY CREW FOUND THAT SPDS WERE '5 KTS' TOO HIGH FOR WT AND FLAP CONFIGN. ALTHOUGH CONSERVATIVE IN NATURE, I SHOULD HAVE CLOSELY CHKED FMC DATA.

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.