25.) For Ground Ops, center tank fuel pumps must not be on unless?
The center tank exceeds 1000 lbs,
(except when defueling or transferring fuel).
Note: Fuel may be transferred from tank to tank or the aircraft may be defueled with Passengers onboard, provided the fuel quantity in the tank from which fuel is being taken is maintained at not less than 2,000 lb. Deplane all Passengers and non-essential Crew when defueling a tank or transferring fuel from a tank that has a fuel quantity below 2,000 lb until the process has been completed and the respective fuel boost pumps are turned off.