737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System –
Controls
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 10.17.7
2 Runway Length
Displays current runway length in feet or meters as indicated on the display
screen. To change the value of runway length, use the MCDU numeric keypad to
erase and record the new runway length. The HGS accepts runway lengths from 0
to 99,999 feet or the equivalent in meters. When the new value shows correctly on
the scratch pad line, push the line select key. If a value does not agree with
acceptable limits, "*INVALID LENGTH*" shows on the MCDU scratch pad line
and the operation of roll out guidance or low visibility takeoff modes is prevented.
Push the "CLR" key to remove the invalid length and re-enter the correct length.
• L XXXXX - valid entry is 0 to 99,999 feet, however, entries between
7,500 and 13,500 feet are required to display ground roll guidance for
low visibility takeoff operations.
Note: When a flight plan is entered into the FMC, runway data (length, elevation,
and glideslope angle) is automatically entered into the HGS for the
departure and arrival runways. The runway data shows on the display in
small characters. The Captain or First Officer verifies the correct data is
displayed on the MCDU. Once determination is made and verified that the
runway data is correct, the pilot then pushes the applicable line select keys
two times each to change the small characters to large characters. Once the
large characters appear on the display and are correct, the data is
transmitted to the HUD and applicable approach displays.
3 Runway Elevation Line
Use the MCDU numeric keypad to record the runway elevation. For negative
elevations, first push the "+/–" function key and then record the new runway
elevation. When the new value shows correctly on the scratch pad line, push the
line select key to enter it into the HGS.
The HGS accepts runway elevations from –9,999 to 99,999 feet (feet only) and
refer to Mean Sea Level (MSL). If a value does not agree with these limits,
"*INVALID ELEVATION*" shows on the MCDU scratch pad line. Push the
MCDU "CLR" key to remove "INVALID ELEVATION" message from the
MCDU scratch pad.
• E XXXXX - valid entry is – 9,999 to 99,999 feet.
4 Glideslope Angle
Use the MCDU keypad if necessary to change or record the value of the glideslope
angle. To remove the displayed value, push the MCDU "CLR" key. Key in the
new value using the numeric keypad. When the new value shows correctly on the
scratch pad line, push the corresponding line select key 3 left. The new glideslope
angle then shows on the display and the previous value is erased.
March 27, 2009
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