Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 192
Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented
Human Factors; Equipment / Tooling
In flight I received an ACARs message that revised our zero fuel weight. The new weight was 1;100 pounds more. No adverse conditions were caused by the error. Upon landing; I was advised that the system computers were dropping bags out of the calculations with no indication to the operators.
ACARS message revised Zero Fuel Weight (ZFW) one hour into flight. We entered new data into FMC. Performance and landing weight ok. NO MZFW or MAX After Take Off Gross Weight (ATOG) were exceeded. No envelope or CG limit was out of tolerance; supposedly a computer malfunction on aircraft loading side.
B737-700 flight crew was advised one hour into flight that their zero fuel weight had gone up by 1;100 pounds due to a computer glitch.