737 Flight Crew Operations Manual
Flight Instruments, Displays -
Head-Up Display System –
Controls
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10.17.8 D6-27370-866-EGP
The HGS accepts glideslope angles from –0.00° to –9.99°. The minus sign ("–")
and trailing zeroes do not have to be entered as part of the value. If a value does
not agree with these limits, "*INVALID G/S*" shows on the MCDU scratch pad
line. Push the MCDU "CLR" key to remove "*INVALID G/S*" message from the
MCDU scratch pad and re-enter the correct value.
For an AIII approach, the HGS accepts glideslope angles from –2.50° to –3.00°.
The minus sign ("–") and trailing zeroes do not have to be entered as part of the
value. If a value does not agree with these AIII limits, the operation of AIII mode
is prevented.
5 Clear HGS
Line select key 5 left clears images from HUD:
• Removes all symbology from the Combiner display
• The letters "CLR HGS" are highlighted on the MCDU display.
6 HGS Modes
Line select key 6 left accesses the "HGS Modes" page
• To change modes, push the line select key next to the name of the mode.
7 HGS Test
Pushing line select key 6 right initiates the TEST
• All legends come on and stay on
• To end the test, push the "EXIT>" line select key on the MCDU.
March 27, 2014
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