Gulfstream Aerospace G550, Руководство по эксплуатации, Страница: 54 / 62

(8) RCT pushbutton engages the Rain Echo Attenuation Compensation
Technique or RCT operating mode. The RCT mode enables the RTA
receiver to automatically adjust sensitivity to compensate for
attenuation loss as the radar transmitting pulse passes through
precipitation in order for the radar to detect additional precipitation
behind the nearest area or to detect embedded areas of significant
precipitation. If the radar receiver is unable to compensate for
attenuation because of the topography of the precipitation areas, the
non-attenuated areas will be shown in cyan and any precipitation
detected displayed as magenta, the most severe condition, as a
precautionary measure since the radar cannot accurately judge
intensity in the non-attenuated region.
(9) TRB pushbutton enables a turbulence detection mode. In this mode
the RTA transmits at a rate of approximately fourteen hundred
(1,400) pulses per second at a power output of ten kilowatts (10
kW). Returns from the rapid pulses are used to detect areas of
significant vertical movement of precipitation that are often
associated with moderate or greater turbulence. Any area containing
detected turbulence will be displayed as grey to white.
WARNING
THE RADAR SYSTEM CAN ONLY INDICATE
LIKELY (BUT NOT ALL) AREAS OF TURBULENCE
ASSOCIATED
WITH PRECIPITATION. RADAR
CANNOT DETECT CLEAR AIR TURBULENCE.
An additional automatic control mode is incorporated into the RTA, termed
Forced Standby (FSBY) mode. This mode employs an input from the
Weight-On-Wheels (WOW) system to place the radar system in standby
whenever the aircraft is on the ground in order to preclude injury or
damage from transmitter microwave pulses. The forced standby mode may
be cancelled by depressing the STAB pushbutton four (4) times within
three (3) seconds.
WARNING
IF THE FORCED STANDBY MODE IS CANCELLED
IN ORDER TO OPERATE THE RADAR ON THE
GROUND OR TO PERFORM A SYSTEM TEST,
OBSERVE THE STANDOFF DISTANCES CITED
ABOVE.
A complete discussion of the PRIMUS-880 radar system, accompanied by
illustrations of the color-coded precipitation formats, is contained in Section
2B-13-00.
2. Lightning Sensor System:
The Lightning Sensor System (LSS) is an optional feature that may be installed to
complement the weather radar system. When installed, the system uses an
antenna located at the top of the vertical stabilizer to detect the electromagnetic
energy released during lightning strikes within a two hundred (200) mile range of
the aircraft. The system is capable of tracking up to fifty (50) areas of lightning
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS
2A-31-00
Page 54
July 15/04
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