Piper ARCHER III Pilot Operating Handbook page 260

SECTION 9
SUPPLEMENT 11
SECTION 1 - GENERAL
This supplement provides information necessary for the operation of the
aircraft with the BF Goodrich WX-500 Stormscope.
Never use your Stormscope system to attempt a
thunderstorm. The FAA Advisory Circular,
Subject: Thunderstorms, and the Airman's
Information Manual (AIM) recommend that a
pilot "avoid by at least 20 miles any
thunderstorm identified as severe or giving an
intense radar echo."
There are several atmospheric phenomena other
than nearby thunderstorms that can cause
isolated discharge points in the strike display
mode. Clusters of two or more discharge points
in the strike display mode, however, do indicate
thunderstorm activity when they reappear after
clearing the screen. Avoid the clusters and you'll
avoid the thunderstorms. In the cell display
mode, even a single discharge point may
represent thunderstorm activity and should be
avoided.
SECTION 2 - LIMITATIONS
The BF Goodrich Aerospace WX-500 Stormscope Users Guide, p/n 009-
11501-001, Rev. A, dated September 10, 1997, or later appropriate revision,
must be immediately available to the flight crew whenever weather avoidance
is predicated on the use of this system.
SECTION 3 - EMERGENCY PROCEDURES
No change.
REPORT: VB-1611
9-60, 2 of 4
WARNING
CAUTION
REVISED: JULY 14, 2000
PA-28-181, ARCHER III
ISSUED: JULY 12, 1995