GOL 737-8, Руководство по эксплуатации

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737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
MN-FLT-OH-201 11.20.19
The Multiscan Radar includes the following features:
Path Attenuation Compensation (PAC) Alert places a yellow arc on the outer most
range scale to warn the pilot if intervening rain fall has created an attenuated area.
PAC Alert is operative whenever the radar is being operated in CAL gain and the
aircraft is within 80 NM of a thunderstorm. PAC Alert is activated during both
automatic and manual radar operation.
Oceanic Weather Reflectivity Compensation uses aircraft navigation inputs to
identify oceanic regions and adjusts gain and tilt to account for the decreased
reflectivity of oceanic thunderstorms. Thunderstorm thresholds are adjusted to
more accurately represent the true thunderstorm threat to the aircraft.
OverFlight protection is designed to prevent thunderstorms that are in the aircraft
flight path from falling below the radar beam and off the radar display during high
altitude cruise. At extended ranges the upper MultiScan radar beam scans the wet,
reflective portion of a thunderstorm in the same manner that conventional radar
scans weather. As the aircraft approaches the storm and the cell begins to fall
below the upper radar beam, MultiScan utilizes 6000 ft of bottom beam
information to keep the reflective part of the storm in view. Within approximately
15 NM of the aircraft, MultiScan compares the stored digital image of the
thunderstorm with the latest sweep information and shows whichever return is
greater. If a cell that is a threat to the aircraft begins to fall below the radar beam,
MultiScan shows the stored digital image of the storm to make sure that any threat
thunderstorm remains on the display until it moves behind the aircraft. OverFlight
protection is operational above 22000 ft MSL
Predictive OverFlight tracks cells below the aircraft and measures their growth
rate and intensity when in AUTO and WX+T mode is selected. The system
predicts turbulence above the cell and the increasing storm threat along the aircraft
flight path. Predictive OverFlight is based on actual radar returns and the resultant
analysis of cell growth, not on inference. Predictive Overflight shows as a red
enclosure filled with red dots. Predictive OverFlight functions in AUTO mode
only with WX+T selected.
March 1, 2021