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SIGNAL
GPWS
(Audio Inhibit)
GEAR
(Landing Gear Switch Input)
009-11900-001
Revision F
The document reference is online, please check the correspondence between the online documentation and the printed version.
SKY899
Installation Manual
CHARACTERISTICS
This input senses a terrain warning alarm and temporarily disables the
SKY899 audible alert messages until the warning clears (see paragraph
2.7.1).
The input can be either a constant flag signal or an alternating flag
output. The flag must be cleared for five (5) seconds before the TRC
accepts a "NO ALARM" condition and restores audible alerts.
AIRCRAFT IS NOT EQUIPPED WITH TERRAIN WARNING SYSTEM
THIS INPUT UNCONNECTED
If the aircraft is equipped with terrain warning system the
GPWS, EGPWS, or TAWS flag must be connected to the TRC.
CONNECTION
Connector-Pin
P1-34
CABLE
Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE
Active Low: (ref. to aircraft electrical ground)
Active High: (ref. to aircraft electrical ground)
CURRENT
<5 mA sourced.
This signal line is to be connected to the landing gear switch to sense the
position of the landing gear (fixed, up or down, see paragraph 2.7.2). The
state of the switch can be active low or active high in reference to aircraft
ground. The switch status can be fixed, active low or active high, this is
selected via service menu.
IF THE AIRCRAFT DOES NOT HAVE A LANDING GEAR SWITCH
MUST REMAIN UNCONNECTED
compatible radio altimeter is installed, the system will default to the highest TA
sensitivity level (level B) and audio TA announcements (i.e., "traffic, traffic") will
not be inhibited during takeoff and landing.
CONNECTION
Connector-Pin
P1-33
CABLE
Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE
Fixed Gear: Open or no connection
Active Low: (ref. to aircraft electrical ground)
Active High: (ref. to aircraft electrical ground)
CURRENT
<5 mA sourced.
SOURCE Z
>40 kΩ
MAX CAPACITANCE <20 pF
.
NOTE
Signal Name
(GPWS)
WARNING: -5 V dc to +2.5 V dc
NO WARNING: +9 V dc to +30 V dc or open
WARNING: +9 V dc to +30 V dc
NO WARNING: -5 V dc to +2.5 V dc or open
.
With this configuration, if no ARINC 429
Signal Name
GEAR
Gear Down: -5 V dc to +2.5 V dc
Gear Up: +9 V dc to +32 V dc or open
Gear Down: +9 V dc to +32 V dc
Gear Up: -5 V dc to +2.5 V dc or open
Appendix A - Page A-5
IF THE
,
LEAVE
,
THIS INPUT
July 18, 2013
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