Control Surface Balancing; General; Control Surface Balance - Diamond DA20-C1 Maintenance Manual

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DA20-C1 AMM

General

This section describes how to weigh and balance the control surfaces. Refer to Chapter 06-00 for values

of weight and balance for each control surface.

WARNING:

YOU MUST WEIGH AND BALANCE A CONTROL SURFACE AFTER ANY WORK

WHICH COULD AFFECT ITS WEIGHT OR BALANCE. OUT-OF-BALANCE

CONTROL SURFACES CAN FLUTTER AND CAUSE STRUCTURAL FAILURE.

Correct control surface balance is critical to flight safety. You must remove a control surface to weigh and

balance it after:

Any repair to the control surface

Painting the control surface

Any report of control vibration in flight.

You can use any convenient method to weigh a control surface. If you use anything to connect the

weighing device to the control surface, you must weigh it separately. Then subtract its weight from the

total value. For example, you use a sling to lift a flap with a spring balance:

Weight of the flap and the sling =

Weight of the sling =

Weight of the flap = 4.3 - 0.6=

When you balance a control surface, the pivot axis must be horizontal. We recommend that for the flaps,

ailerons and elevator, you put a 6.4mm (1/4 in) rod through the hinge bearings. Support the rod at 2

points to keep it horizontal.

Control Surface Balance

Figures 1 to 4 show you how to balance each control surface. Use a spring balance to measure the force

needed to hold the control surface horizontal as shown in the Figure. Measure the arm from the trailing

edge where the tape is, to the pivot axis. The moment is the force measured by the spring balance x the

arm. Note the optional method for the flaps.

DA201-C1

Rev 16