Installation Manual

Lynx NGT-9000
Installation Manual
0040-17001-01 (Revision W) Installation Checkout Page 3-28
b. Ground Speed Thresholds (knots)
• Max Ground Speed: The valid range is 30 to 100. Typically, 70% of Vs0. Must be less
than the Discrete Override Speed.
This is the upper threshold speed which aircraft is considered on ground. Ground speeds
below this level place the unit in the Ground state. Fields that become inhibited get set to
zeros. As fields become uninhibited, the values are reset to defaults.
• Discrete Override Speed: Applicable only when On Ground Discrete installed and not a
Rotorcraft. When applicable, the valid range is 30 to 100, typically 130% of Vs1, and must
be greater than Max Ground Speed.
This is the lower threshold speed which aircraft is considered in air. Ground speeds above
this level place the unit in the In Air state, overriding the discrete switch.
c. Altitude Thresholds (feet)
• GPS Altitude: The valid range is 0 to 500.
This value is used for fixed wing and rotorcraft installs that do not have an air/ground
discrete. This is the lower limit threshold difference in GPS altitude after Power ON at
which aircraft is considered in air. A change in GPS altitude above this level places the unit
in the In Air state.
• Pressure Altitude: The valid range is 0 to 500.
This value is used for fixed wing and rotorcraft installs that do not have an air/ground
discrete. This is the lower limit threshold difference in pressure altitude after Power ON at
which aircraft is considered in air. A change in pressure altitude above this level places the
unit in the In Air state.
- Set the pressure altitude at 150 if Gillham/Gray-code is used.
6. Standby Input:
This setting is used to set the transponder function of the Lynx NGT-9000 into standby. It is typically
used in dual installations. Available with Release 2.1 and greater.
a. Standby Discrete Installed
• Not Installed: Normal setting for single installation.
• Ground – Standby: This setting activates Discrete In 6 (pin 32). When an external switch is
set to ground the NGT-9000 transponder function is set to standby.
Note – Transponder mode cannot be changed using a control panel when this external
discrete is grounded, though the Mode A code can be set for eventual use.
7. Input/Output Configuration:
The following settings are based on equipment interfaces setup during installation.
a. RS-422 #1
• Control Panel/External Display: Typically used by the remote mount NGT-9000R to
output traffic and FIS-B information.
• WX-500: Alternate method of interfacing with the WX-500 Stormscope. Panel mount
NGT-9000 only. Depending on settings this input can also be used by the NGT-9000 for
heading.
• L-3 Protocol 1: This setting outputs GPS Position Source.
WAAS/GPS Output: Certified 5 Hz, RS-422/RS-232 and WiFi Class Beta 1 GPS output.
Qualified for LNAV approaches only per TSO-C129d Table 1-1.