MENU Function Key
Push - shows page of subsystems controlled by CDU.
HUD Key
Push - selects HUD as the system for which the CDU is active in providing control/display function.
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Flight Instruments, Displays -Head-Up Display System -Displays
737 Flight Crew Operations Manual
HUD Mode (MODE)
Displays HUD mode:
.
NP - non-precision mode
.
AI - Cat I approach mode
.
AII - Cat II approach mode
.
AIII -Cat IIIa approach mode.
Active mode is highlighted.
Reference Glideslope (G/S ANGLE)
Displays glideslope angle (minus sign not displayed as value is always negative):
.
the default value is 3.00°
.
valid entry is 2.00° to 4.00°, however, entries between 2.50° and 3.00° are
required for AIII mode operation
.
an invalid value entered results in a “G/S INVALID” message on the
scratchpad.
.
a value of 0 removes the glideslope reference line from the combiner
display
Runway Length (RWY LENGTH)
Displays runway length:
.
the default value is 10000 feet
.
valid entry is between 5000 and 15000 feet, however, entries between
5500 and 13600 feet are required for AIII mode operation
.
an invalid value entered results in a “LENGTH INVALID” message on
the scratchpad.
Runway Elevation (RWY ELEV)
Displays runway elevation:
.
the default value is 0 feet
.
when a runway is selected for departure or arrival, the nav database
runway elevation is set as the default
.
valid entry is between -1000 and 12000 feet
.
an invalid value entered results in a “ELEVATION INVALID” message
on the scratchpad.
Maintenance (MAINT)
Used for maintenance purposes only. Displayed only on the ground.
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Flight Instruments, Displays -Head-Up Display System -Displays 737 Flight Crew Operations Manual
Self Test (TEST)
Allows selection of the HUD self test:
.
after selection, initially shows “RUNNING”. After completion, the CDU shows either “PASSED” or “FAILED”
.
a test pattern shows on the combiner which allows the pilot to adjust for optimum viewing. Successful alignment results in the following pattern clearly visible to the pilot.
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YA721 - YA809, YC411 - YD655
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Flight Instruments, Displays -EFIS Instruments (PFD) – Controls 737 Flight Crew Operations Manual
Minimums (MINS) Reference Selector (outer) (two position)
RADIO – selects radio altitude as the minimums reference BARO – selects barometric altitude as the minimums reference.
Minimums (MINS) Selector (middle) (slew)
ROTATE – adjusts the radio or baro minimums altitude.
Radio Minimums (MINS) Reset (RST) Switch (inner) (momentary action)
PUSH –
.
resets the alert minimums annunciation
.
blanks minimums display if alert is not active.
Meters (MTRS) Switch (momentary action)
PUSH – displays altitude indications in meters.
Barometric (BARO) Reference Selector (outer) (two position)
IN – selects inches of mercury as the barometric altitude reference HPA – selects hectopascals as the barometric altitude reference.
Barometric (BARO) Selector (middle) (slew)
ROTATE –
.
adjusts the barometric altitude setting on the altitude tape
.
if STD displayed, adjusts the preselected BARO reference.
Barometric (BARO) Standard (STD) Switch (inner) (momentary action)
PUSH –
.
selects the standard barometric setting (29.92 inches Hg/1013 HPA) for
barometric altitude reference
.
if STD is displayed, selects the preselected barometric reference
.
if no preselected barometric is displayed, displays the last value before
STD was selected.
Flight Path Vector (FPV) Switch (momentary action)
YA613 - YC413, YK101 - YK104
PUSH – displays flight path vector on the attitude indicator.
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