In the weight change record of a— Large cabin aircraft Medium cabin aircraft Small cabin aircraft An operator should record any weight changes of— ± 10 lb or greater ± 5 lb or greater ± 1 lb or greater Figure 9-3.  Incremental weight changes that should be recorded in a weight and balance change record. Documenting Changes to an Aircraft’s  Weight and Balance  Determining the Loaded CG of the  Airplane in Percent MAC Figure 9-4.  Loading schedule. 9-3 Item Weight (lb) Moment/1,000 92,837 1,781 16,602 1,020 2,915 10,451 10,451 25,589 161,646 BOW Passengers Fwd station Passengers Aft station Fwd cargo Aft cargo Fuel tank 1 Fuel tank 3 Fuel tank 2 105,500 3,060 16,150 1,500 2,500 10,500 10,500 28,000 177,710 Basic operating weight .................................. 105,500 lb Basic operating index (total moment/1,000) .... 98,837.0 MAC .................................................................. 180.9 in LEMAC ................................................................. 860.5 Use the data in this example: The formula in  Figure 9-6 can be used to determine the  location of the CG in inches aft of the datum. A loading schedule is used to document compliance with the  certificated weight and balance limitations contained in the  manufacturer’s AFM and weight and balance manual. The  basic operating weight (BOW) and the operating index are  entered into a loading schedule like the one in  Figure 9-4,  and  the variables for a specific flight are entered as appropriate  to determine the loaded weight and CG. The weight and balance system should include methods by  which a complete, current, and continuous record of weight and CG of each aircraft is maintained, such as a log,  ledger, or other equivalent electronic means. Alterations and  changes affecting the weight and/or balance of the aircraft  should be recorded in this log. Changes in the weight or  location of weight in or on the aircraft should be recorded  whenever the weight change is at or exceeds the weights  listed in  Figure 9-3 . Figure 9-5 illustrates passenger, cargo, and fuel loading  tables. Using these tables, determine the moment indexes  for the passengers (PAX), cargo, and fuel. The airplane is loaded in this way: Cargo Fuel Forward compartment................................................. 18 Aft compartment......................................................... 95 Forward hold...................................................... 1,500 lb Aft hold.............................................................. 2,500 lb Tanks 1 and 3...........................................10,500 lb each Tank 2 .............................................................. 28,000 lb Passengers (nominal weight—170 pounds each)