12.106.2(j) . maximum certified take-off weight (MCTOW). 

MCTOW is the maximum certificated gross weight permitted to take off

12.106.2(i) . gross weight (AUW); 

This is the total weight of the aircraft and its contents at any particular time’
Equals basic weight plus pilot plus passengers, baggage and cargo, plus ballast plus fuel load

12.106.2(h) . zero fuel weight (ZFW); 

This is the gross weight of the aircraft excluding the usuable fuel in the wing fuel tanks
– includes the pilot, payload and ballast but none of the usable fuel
– usable fuel is not included / unusable fuel is included

12.106.2(g) . basic aircraft empty weight (standard empty weight); 

This includes the weight of the airframe and engine, fixed equipment, unuseable fuel, full oil and other items necessary for all flights

Does not include passengers and freight – pilot or payload

12.106.2(f) . station; 

12.106.2(e) . longitudinal C of G range and associated limits; 

12.106.2(d) . centre of gravity (C of G); 

12.106.2(c) . moment (including units used); 

Moment of a force depends on 2 things

– The magnitude of the force and
– the moment arm which is the distance between the point at which the force is being applied and the pivot point or fulcrum’

12.106.2(b) . datum; 

This is a point which is specified by aircraft manufacturers in the weight and balance data supplied.
Some choose the nose of the aircraft as the datum

12.106.2(a) . arm (moment arm); 

The moment arm is the distance between the point at which the force is applied aqnd the pivot point / fulcrum