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The static discharger is flexible in order to ensure the safety of people walking around the aircraft. It is rod—shaped and composed of several wires of semi—rigid carbon fibers.
4. OPERATION
The electrostatic charges mainly result from the impact speed or the friction of particles suspended in the air,
over the different parts of the aircraft. The electrostatic charges get more significant when going through various kinds of precipitations (rain, snow or ice crystals). The static discharger discharges electostatic charges in the atmosphere generating a diminution of noise (in the radio—frequency spectrum). The noise issued from the electrostatic discharge can create mistakes or variations on the indications supplied by on—board system (ADF).
The NAV/COM systems on the VHF upper frequencies can be disturbed.
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A — Standard static discharger
Static dischargers — Identification and location of components
Figure 1 — SOCATA
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A — Optional static discharger
®
Static dischargers — Identification and location of components
Figure 1A — CHELTON
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STATIC DISCHARGERS
MAINTENANCE PRACTICES
1. SERVICING
None
2. REMOVAL / INSTALLATION — STATIC DISCHARGER
None
3. ADJUSTMENT / TEST — STATIC DISCHARGER (Figure 201)
A. Tools and consumable materials
— Wet sponge
— Megohmmeter, P/N RL2102 AOIP or equivalent
— Steel wool
B. Static discharger test
WARNING : THIS TEST INVOLVES HIGH VOLTAGE. DURING THE TEST, HOLD THE TEST CABLES FROM THE INSULATED END.
1) Using a cable fitted with an alligator clip, connect static discharger base (3) to the negative terminal of megohmmeter (2).
2) Attach a wet sponge (1) to a cable fitted with an alligator clip at one of its ends. Connect the other end of the cable to the positive terminal of the megohmmeter.
3) Set the megohmmeter for a minimum resistance measurement of 10 MS2 at a 500—VDC test voltage.
4) Touch the static discharger end with the wet sponge.
NOTE : Perform the measurement while holding the static discharger straight.
5) Read the resistance measured by the megohmmeter.
NOTE : If the measured resistance is less than 6 MS2, replace the wet sponge with a piece of steel wool. Perform a new resistance measurement.
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