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However, cabin pressures will vary With open cabin ventilators or win
dows.
The most adverse combinations will result in airspeed and alti
meter variations of no more than 6 MPH and 50 feet respectively.
In climb and cruising flight, the airspeed and altimeter will read
high.
However, in the landing approach (when instrument readings are
more important) the instruments win generally read low.
using the normal published approach speeds and altttudes Will result in
a slightly faster approach speed and higher approach path than normal,
giving an extra margin of safety.
If frequent IFR flights are planned, installation of optional wick-type
static dischargers is recommended to improve radio communications
during flight through dust
ing rain, snow or ice crystals).
discharge of static electricity from the trailing edges of the wings, rud
der, elevators, propeller tip s and radio antennas can result in loss of
usable radio signals on all communications and navigation radio equipment.
(Usuall y the ADF is first to be affected and VHF communication equipment
is the last to be affected).
Installation of static dischargers reduces interference from preCip
itation static, but it is possible to encounter severe precipitation static
conditions which might
dischargers installed.
itation areas to prevent loss of dependable radio signals.
impractical, minimize airspeed and anticipate temporary loss of radio
signals while in these areas.
STATIC DISCHARGERS
or various forms
Under these conditions, the build-up and
the loss of radio Signals, even with static
cause
Whenever poSSible, avoid known severe precip
of precipitation (rain,
If avoidance is
Therefore,
freez
7-3
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