Ch 10 - Methods For Weighing AC

Question 1

Weighing

Answer 1

The manufacturer starts off the mass and Balance program

The operators responsibly to weigh the AC but the manufacturer usually does it for its first one

Question 2

Weighing Process

Answer 2

Must be clean and empty (BEM conditions) with all the required equipment in place and all the extras removed

In a non-air conditioned hanger with the door closed

In an approved weighing station or by the manufacturers

Question 3

EU Rules

Answer 3

Must be weighed before it enters service (mass and CG) - operators responsibility but manufacturer usually does it

Fleet AC every 9 years

Effect of mod must be accounted for and if not known, must be reweighed

Question 4

Weighing Process

Answer 4

Load cell at each jacking point or under the gear

Can be placed under the wheels (load cell mat)

Minimum of 3 points of support

In hanger; Door closed, AC off and cleaned

Must be cleaned with everything there that makes up BEM
Moments calculated, BEM and CG position declared on schedule

If BEM equipment changes in the interim, must be recorded in technical log

If change in DOM is more than 0.5% of max landing mass, AC must be reweighed and the CG reestablished