L-3 Communications SKYWATCH HP SKY899 Series, Руководство по установке, Страница: 129 / 184

SKY899
Installation Manual
009-11900-001 Appendix A - Page A-5
Revision F July 18, 2013
SIGNAL CHARACTERISTICS
GPWS This input senses a terrain warning alarm and temporarily disables the
(Audio Inhibit) 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.
IF THE
AIRCRAFT IS NOT EQUIPPED WITH TERRAIN WARNING SYSTEM
,
LEAVE
THIS INPUT UNCONNECTED
.
NOTE
If the aircraft is equipped with terrain warning system the
GPWS, EGPWS, or TAWS flag must be connected to the TRC.
CONNECTION Connector-Pin Signal Name
P1-34 (GPWS)
CABLE Minimum 22 AWG wire for lengths up to 30 ft.
VOLTAGE Active Low: (ref. to aircraft electrical ground)
WARNING: -5 V dc to +2.5 V dc
NO WARNING: +9 V dc to +30 V dc or open
Active High: (ref. to aircraft electrical ground)
WARNING: +9 V dc to +30 V dc
NO WARNING: -5 V dc to +2.5 V dc or open
CURRENT <5 mA sourced.
GEAR This signal line is to be connected to the landing gear switch to sense the
(Landing Gear Switch Input) 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
,
THIS INPUT
MUST REMAIN UNCONNECTED
.
With this configuration, if no ARINC 429
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 Signal Name
P1-33 GEAR
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)
Gear Down: -5 V dc to +2.5 V dc
Gear Up: +9 V dc to +32 V dc or open
Active High: (ref. to aircraft electrical ground)
Gear Down: +9 V dc to +32 V dc
Gear Up: -5 V dc to +2.5 V dc or open
CURRENT <5 mA sourced.
SOURCE Z >40 k
Ω
MAX CAPACITANCE <20 pF
The document reference is online, please check the correspondence between the online documentation and the printed version.