Consider the following statements:

1) Maximum gross take-off weight is the maximum load which the aircraft is certified to carry during take off.

2) Maximum structural landing weight is the difference between gross take off weight and weight of fuel consumed during trip.

3) The term pay load is used to mean the total revenue – producing load and includes passengers but it excludes the weight of baggage, mail and cargo.

4) Operating empty weight is the weight of an aircraft including crew and all the necessary gear required for flight and it does not include pay load and fuel.

The correct statements are: