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resets the radio minimums alert display to a normal display.
The radio minimums shows on the captain and first officer
display units. The left EFIS control panel controls the captain
display units. The right EFIS control panel controls the first
officer display units.
The minimums controls have these three controls:
* A two-position rotary switch (minimums reference selector)
* A spring loaded rotary switch (minimums altitude selector)
* A radio minimums reset (RST) switch.
You use the radio position on the minimums reference selector
to set the radio minimums.
To set a radio minimums value, use the rotary switch to adjust
the value between -1 feet and +999 feet.
Push the radio minimums reset (RST) switch to set the radio
minimums alert display back to normal.
Display Unit
The display unit (DU) shows radio altitude and radio minimums
values. The flight crew uses this data during an approach and a
landing.
Radio altitude shows in white for airplane altitude between -12
and 2500 feet. This is when the radio altitude values update:
* Two foot increments from -12 to 100 feet
* Ten foot increments from 100 to 500 feet
* Twenty foot increments from 500 to 2500 feet.
The radio altitude does not show above 2500 feet.
The white radio altitude shows as a digital display on the DU for
altitudes between -12 and 2500 feet. For altitudes between 0 and
1000 feet, a round dial shows around the digital display. The dial
has increments of 100 feet. As the radio altitude increases or
decreases, the display adds or removes the perimeter of the
dial. A green radio minimums bug moves around the dial and
shows the value selected from the EFIS control panel radio
mins altitude selector.
The green radio minimums display shows above the digital
radio altitude display. The radio minimums display does not
show for these reasons:
* Baro minimums is selected on the EFIS control panel
* Radio minimums reset switch is pushed
* Radio minimums value is less than zero.
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The green radio minimums display shows above the digital
radio altitude display when the airplane is on the ground or
when radio altitude is more than 1000 feet. If the radio
minimums value is selected to a value less than zero feet, the
display is removed.
Radio Minimums Alert
A radio minimums alert occurs when the radio altitude of the
aircraft is the same as the selected radio mins altitude value
from the EFIS control panel. The radio minimums alerts occur
separately between the captain and first officer displays.
When a radio minimums alert occurs, the radio altitude display
changes from white to amber.
Also, the radio altitude dial changes from white to amber and
goes on and off for three seconds and the decision height bug
changes from green to amber and goes on and off for three
seconds.
After three seconds, the display continues to show amber until it
is set back to normal.
Each of these procedures sets the radio minimums alert back to
normal:
* Push the reset (RST) switch on the EFIS control panel
* The airplane climbs to 75 feet above the radio minimums
value
* The airplane lands.
When radio minimums is set to normal, the radio altitude and
the radio altitude dial go back to white, and the radio minimums
bug goes back to green.
Rising Runway
The rising runway shows in two colors, a magenta stem with a
green trapezoid box on the top. The rising runway shows at the
bottom of the ADI when these conditions occur:
* Radio altitude is less than 2500 feet
* ILS localizer deviation shows on the ADI.
The rising runway symbol moves toward the airplane symbol
on the ADI as the airplane altitude decreases from 200 feet to 0
feet. At 0 feet, the rising runway shows at the bottom of the
airplane symbol. The rising runway symbol also moves left and
right to stay aligned with the ILS localizer deviation pointer.
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-33-00-009
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RA SYSTEM - OPERATION - 1
EFFECTIVITY
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