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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