Urban Canyon Flight Inc UC10X ユーザーズマニュアル
UC10x Installation Manual
URBAN CANYON FLIGHT INC
UC10X-001-IM REV02
CONFIDENTIAL & PROPRIETARY
PAGE 58 OF 69
12.1.9 GPS NAC velocity
Another metric that the ADS-B ground system uses to help it track the aircraft is NACv. NACv is the Navigational
Accuracy Category for velocity, and is a design feature of the GPS receiver. It represents the error bound for
velocity that the GPS may report in acceleration/deceleration or turning maneuvers. You can find this information
from your GPS installation manual.
12.1.10
Aircraft Length and Width
On the ground, ADS-B transmits encoded aircraft size information which is used by ATC to identify taxiing routes
and potential conflicts. When configured for ADS-B, the UC10x will require aircraft length and width (wingspan)
information, in meters, for proper configuration.
12.1.11
GPS Antenna Offset
The GPS antenna offset is used together with the aircraft length and width to manage taxiway conflicts. A typical
GPS installation does not report the geographic position of the center of the aircraft, or even the tip of the nose of
the aircraft; instead it usually reports the location of the actual GPS antenna (not the GPS receiver). During normal
flight operations, this distinction is of no practical importance at all, but if ADS-B is used to manage taxiway
conflicts, a significant offset in antenna position could mean that the aircraft is not in the same place as the ADS-B
reported position. Although primarily intended for position correction on large transport aircraft, General Aviation
aircraft can also have a significant offset. For example, if the aircraft has a long tail boom and the GPS antenna is
on the top of the tail, the GPS position could be 4 meters or more from the nose of the aircraft. Enter the position
of the GPS antenna relative to the nose of the aircraft. The position is stored and transmitted to the nearest 2
meters; great accuracy in measurement is not required.
12.1.12
1090 MHz Receiver Installed
The ADS-B transmissions include an indication to the ground stations of whether your aircraft includes a 1090 MHz
ADS-B receiver. This is then used by ground stations to manage the RF spectrum for uplink of traffic data. If you
have a 1090 MHz ADS-B receiver installed, be sure to indicate it so that you receive appropriate traffic data.
12.1.13
UAT Receiver Installed
The ADS-B transmissions include an indication to the ground stations of whether your aircraft includes a UAT ADS-
B receiver. This can be used by the ground stations to manage the uplink of traffic, weather, pilot data, etc. If you
have a UAT receiver installed, be sure to indicate it so that you receive appropriate data uplink.
12.2 Test and Calibration Items
12.2.1 Altitude Encoder Calibration
The Altitude Encoder is not provided with the UC10x. However, altitude encoder data—sourced from a static
pressure sensor—must be provided.
Altitude encoder calibration is typically performed every 24 months, as part of the altimeter checks on the aircraft.
Altitude encoder calibration ensures that the altitude transmitted by the transponder corresponds to the altitude
seen by the pilot on the primary altimeter. The maximum allowed difference between the primary altimeter and
the altitude encoder is 125 ft. (per ETSO-C88a and TSO-C88b).