PRIMUSr 880 Digital Weather Radar System
INTENSITY | AIRCRAFT REACTION | REACTION INSIDE |
AIRCRAFT | ||
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| Turbulence that momentarily causes | Occupants may feel a slight |
LIGHT | slight, erratic changes in altitude and/or | strain against seat belts or |
attitude (pitch, roll, yaw). | shoulder straps. Unsecured | |
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| objects may be displaced |
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| slightly. |
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| Turbulence that is similar to light | Occupants feel definite |
| turbulence but of greater intensity. | strains against seat belts or |
MODERATE | Changes in altitude and/or attitude | shoulder straps. Unsecured |
occur but the aircraft remains in | objects are dislodged. | |
| positive control at all times. It usually |
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| causes variations in indicated |
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| airspeed. |
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| Turbulence that causes large abrupt | Occupants are forced |
SEVERE | changes in altitude and/or attitude. It | violently against seat belts |
usually causes large variations in | or shoulder straps. | |
| indicated airspeed. Aircraft may be | Unsecured objects are |
| momentarily out of control. | tossed about. |
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Turbulence Levels
(From Airman’s Information Manual)
Figure 5- 34
Hail Size Probability
Whenever the radar shows a red or magenta target, the entire storm cell should be considered extremely hazardous and must not be penetrated. Further support for this statement comes from the hail probability graph shown in figure 5- 35. The probability of destructive hail starts at a rainfall rate just above the red level three threshold.
Like precipitation, the red and magenta returns should be considered as a mask over more severe hail probabilities.
By now, it should be clear that the only safe way to operate in areas of thunderstorm activity is to AVOID ALL CELLS THAT HAVE RED OR MAGENTA RETURNS.
A28- 1146- 102- 00 | Radar Facts |
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