Weight Changes Caused by a Repair or Alteration

Weight Changes Caused by a Repair or Alteration

A typical alteration might consist of removing two pieces
of radio equipment from the instrument panel, and a power
supply that was located in the baggage compartment
behind the rear seat. In this example, these two pieces are
replaced with a single lightweight, self-contained radio.
At the same time, an old emergency locator transmitter
(ELT) is removed from its mount near the tail, and a lighter
weight unit is installed. A passenger seat is installed in the
baggage compartment.

Computations Using Weight, Arm, and Moment
The first step in the weight and balance computation is to
make a chart like the one in Figure 5-3, listing all of the
items that are involved.
The new CG of 36.4 inches aft of the datum is determined
by dividing the new moment by the new weight.