Friday, 26 November 2021

STATIC DISCHARGERS DESCRIPTION AND OPERATION

 STATIC DISCHARGERS DESCRIPTION AND OPERATION

During the flight, the aircraft becomes charged with static electricity. If the discharge of static electricity is not controlled.

 it causes interferences in the communtations and navigation systems. 

Static dischargers are installed on the aircraft to decrease the interferences.

Each static discharger assembly has a retainer and a static discharger. The retainer is attached to the structure with rivets.

discharger is attached to its retainer with one screw, to make it easy to replace.

 The static discharger assemblies are installed at the tips of -: 

The horizontal stabilizer

The vertical stabilizer

The elevators

The rudder

They are also installed on the trailing edges of -: 

The wing tip fence

The wing fixed structure

The ailerons

The elevators

The rudder

The flap track movable-fainings

The engine pylon rear-fairings

Two types of retainers are installed:

A flat retainer at the trailing edges

An angular retainer at the tips.

Two types of static dischargers are installed.

One with a straight mounting, installed at the trailing edges

One with a 30-degree angle mounting, installed at the tips. 

These two types are not interchangeable.

Operation/Control and Indicating of The static dischargers -: 

- Decrease the voltage level necessary to start the corona discharge

- Make very low radio-frequency field-strength in areas and thus cause a discharge in these areas

- Discharge the static electricity charge

The effect is to decrease the interferences in the communications and navigation systems 

 Inspection of the Static Dischargers

Examine the static dischargers to make sure that:

there is no distortion

there is no damage to the covers

there is no corrosion of the bases

there is no damage to the tips

the screws are tight and serviceable

they are correctly attached.