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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Federal Aviation Administration (FAA) Advisory Circulars
A-10
If you cannot avoid penetrating a thunderstorm, the following are some
do’s BEFORE entering the storm.
D Tighten your safety belt, put on your shoulder harness if you have
one, and secure all loose objects.
D Plan and hold your course to take you through the storm in a
minimum time.
D To avoid themost critical icing,establish a penetration altitude below
the freezing level or above the level of -15 _C.
D Verify that pitot heat is on and turn on carburetor heat or jet engine
anti-ice. Icing can be rapid at any altitude and cause almost
instantaneous power failure and/or loss of airspeed indication.
D Establish power settings for turbulence penetration airspeed
recommended in your aircraft manual.
D Turn up cockpit lights to highest intensity to lessen temporary
blindness from lightning.
D If using automatic pilot, disengage altitude hold mode and speed
hold mode. The automatic altitude and airspeed controls will
increase maneuvers of the aircraft thus increasing structural stress.
D If using airborne radar, tilt the antenna up and down occasionally.
This will permit you to detect other thunderstorm activity at altitudes
other than the one being flown.
Following are some do’s and don’ts during thunderstorm penetration.
D Do keepyour eyes on your instruments. Looking outside thecockpit
can increase danger of temporary blindness from lightning.
D Don’t change power settings; maintain settings for the
recommended turbulence penetration airspeed.
D Do maintain constant attitude; let the aircraft ride the waves.
Maneuvers in trying to maintain constant altitude increase stress on
the aircraft.
D Don’t turn back once you are in a thunderstorm. A straight course
through the storm most likely will get you out of the hazards most
quickly. In addition, turning maneuvers increase stress on the
aircraft.