A B767-300 flight crew took off with incorrect weights from load planning.

Attributes
ACN	706355
Time
Date	200608
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 120 flight time total : 12000 flight time type : 800
ASRS Report	706355
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : published procedure non adherence : company policies non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Company
Primary Problem	Company

Narrative:

During a busy taxi out of iad including a xbleed start; and ATC re-route while taxiing. Final weights were normally received and entered into the FMC. The weight was approximately 8000 pounds less than planned. Speeds were rebugged and a normal uneventful takeoff followed. Reaching cruise altitude in a conversation with the purser led me to get an actual passenger count which was different than on the final weights from load planning via ACARS. 07/28/91 was sent by load planning; 10/32/133 was on the purser's manifest and; 10/28/124 was the actual head count taken at cruise altitude. I notified load planning via ACARS of the problem and new final weights were sent. A difference of 7200 pounds in zero fuel weight was re-sent while airborne and corrected into the FMC for landing data.

Original NASA ASRS Text

Title: A B767-300 FLT CREW TOOK OFF WITH INCORRECT WTS FROM LOAD PLANNING.

Narrative: DURING A BUSY TAXI OUT OF IAD INCLUDING A XBLEED START; AND ATC RE-RTE WHILE TAXIING. FINAL WTS WERE NORMALLY RECEIVED AND ENTERED INTO THE FMC. THE WT WAS APPROX 8000 LBS LESS THAN PLANNED. SPDS WERE REBUGGED AND A NORMAL UNEVENTFUL TKOF FOLLOWED. REACHING CRUISE ALT IN A CONVERSATION WITH THE PURSER LED ME TO GET AN ACTUAL PAX COUNT WHICH WAS DIFFERENT THAN ON THE FINAL WTS FROM LOAD PLANNING VIA ACARS. 07/28/91 WAS SENT BY LOAD PLANNING; 10/32/133 WAS ON THE PURSER'S MANIFEST AND; 10/28/124 WAS THE ACTUAL HEAD COUNT TAKEN AT CRUISE ALT. I NOTIFIED LOAD PLANNING VIA ACARS OF THE PROB AND NEW FINAL WTS WERE SENT. A DIFFERENCE OF 7200 LBS IN ZERO FUEL WT WAS RE-SENT WHILE AIRBORNE AND CORRECTED INTO THE FMC FOR LNDG DATA.

Data retrieved from NASA's ASRS site as of January 2009 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.