System annunciators and switches
Annunciator/
Switch
Switch
Action
Annunciator Function Switch Function
Amber None
GPWS (amber):
GPWS warning modes 1,
2, 3, 4.
GS (amber):
GPWS warning mode 5
None
Amber None
“
TERRAIN
”: Aural and
visual alert to required
terrain clearance.
None
Amber
Visible
white
Alternate
Action
TERR INOP is illuminated
when:
• TERRAIN function is
inhibited by TERRAIN
INHIBIT switch.
• Terrain Database is
invalid or failed.
• Display Inhibited
Annunciations are
displayed
• Flaps reasonableness
check fail.
• Terrain alert function is
inoperative due to
hardware failure or lack
of required input such
as GPS position or
altitude.
NOTE: TERR
INOP
will be
illuminated after preflight
test is completed for 1 to 3
minutes. TERR INHIB is a
visible white switch legend
only when Terrain Inhibit is
active.
Provides manual inhibit of
TAWS terrain caution
function. When TERR
INHIB is selected, the
message TERRAIN INHIB
SELECTED is displayed.
GPWS
Amber/
white
Alternate
action
NORMAL (blank):
GPWS armed to operate.
FAULT (amber):
GPWS failure.
OFF (white):
GPWS manually switched
OFF.
Provides manual switching
of the GPWS and reset in
case of GPWS fault
annunciation.
GPWS
GS
FAULT
OFF
Fokker 50 - Flight Navigation Instruments
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