What is P-Stat

P-Stat is an acronym for Precipitation Static. P-Stat is a form of electrical discharge usually caused by flying in rain, snow, dust or clouds that interferes with navigation and communication equipment and systems.

What can be done to protect against P-Stat?

Utilizing the correct number of quality static dischargers, properly bonded in their proper location on the aircraft, is fundamental to acceptable protection against P-Stat.

What is streamering?

As aircraft fly through P-Stat conditions, the insulated portions, like fiberglass panels and radomes, become charged and "streamer" the discharge to the airframe. This "streamering" discharge couples into the antenna system and creates noise.

How do static dischargers work?

Static dischargers have a lower corona voltage threshold than the aircraft structure and go into corona before the structure goes into corona. This corona current is bled through a high resistance resistor (8-2000 Megohms), and thus the corona spark is decoupled from the aircraft by approximately 50 db.

Why is bonding important?

When a part of the aircraft (like an access inspection plate) is not bonded, a difference in voltage levels can exist between the two surfaces. As a result of this difference, sparking can be induced across the two un-bonded portions of the aircraft. The energy of the spark can couple into the antenna, and this causes crackling-which interferes with the communication and navigation systems.

 Because it is fundamentally important...

Remember:  Electrostatic problems like these can only be corrected with:

  • The proper number of quality dischargers...

  • Properly installed on a...

  • Properly bonded aircraft.

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