SECTION 7
CESSNA
AIRPLANE & SYSTEMS DESCRIPTIONS
MODEL 172RG
STATIC DISCHARGERS
If frequent IFR flights are planned, installation of wick-type static
dischargers is recommended to improve radio communications during
flight through dust or various forms of precipitation (rain, snow or ice
crystals). Under these conditions, the build-up and discharge of static
electricity from the trailing edges of the wings, rudder, elevator, propeller
tips, and radio antennas can result in loss of usable radio signals on all
communications and navigation radio equipment. Usually the ADF is first
to be affected and VHF communication equipment is the last to be affected.
Installation of static dischargers reduces interference from precipita-
tion static, but it is possible to encounter severe precipitation static
conditions which might cause the loss of radio signals, even with static
dischargers installed. Whenever possible, avoid known severe precipita-
tion areas to prevent loss of dependable radio signals. If avoidance is
i mpractical, minimize airspeed and anticipate temporary loss of radio
signals while in these areas.
7-46
1 July 1979
