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
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?
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
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.