Page 617 - PPL-engelsk 2025

Flight performance and planning

7.2.2.2 Determining the center of gravity – a calculation

Let's now try to solve a practical problem.

We take a pilot weighing 70 kg and a passenger next to him weighing 60 kg. In the

back seat we place 2 passengers who weigh a total of 180 kg. Finally, we put 30
kg of luggage in the luggage compartment. We fill up with 107 kg of gasoline.

We enter the numbers in a table (loading plan) (the numbers with a yellow
background are fixed).

We have to calculate the remaining numbers ourselves – see below.

Weight Kg Moment arm cm Moment arm
in 100 kgcm
Empty weight 724 104 752
Pilot 70 70 49
Passenger front seat 60 70 42
Passenger back seat 180 160 288
Luggage 30 230 69

Dry weight (ZFW) Udregnes*
(takeoff weight – benzin) 1064 113 1200
Benzin 107 110 118
Takeoff weight 1171 113* 1318
Center of gravity between 96 og 117

Max takeoff weight (MTOW) 1200

We started with the aircraft's empty weight and empty center of gravity. These

values can be found in the weighing report or weighing chart in the flight manual.

Next, we multiply the number of kg by the length of the arm in cm, and since it is

a large number, we divide it by 100, so that it is easier to calculate.

Thus, all weight units are multiplied by the length of the corresponding arms, after

which the values are entered on the table.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 617