Part #: 805-10003-001

Model: NY-156






Directional Antenna

Part Number :
L3Harris Logo

  • TCAS I Directional Antenna
  • Teardrop shaped
  • 2 TNC & 1 BNC Connector
  • Same as Sensor System P/N: S72-1744
  • Used in the SKY497 & SKY899 L3 Skywatch/Skywatch HP traffic alert systems
  • When installing an SKY899 TCAS I system, the NY-156 MUST be used; TAS installations can use an alternate antenna (NY-164)
  • Sealed against environmental extremes
  • Are non-repairable
  • Must ensure a tight seal between the airframe & antenna
  • O-ring seal has been incorporated into the design to achieve a tight seal
  • To fit specific airframes, a special adapter plate is also required
  • Installation kits differ in the size of the airframe adapter plate, please confirm the install kit needed for your specific airframe


Size: 11.12"D x 6.23"W x 1.3"H Weight: 2.3 lbs.
Speed: Rated to 600 knots (0.9 Mach) @ 25,000 feet Frequency: 1030-1090 MHz
Operating Altitude: 55,000 feet max TSO Compliance: FAA TSO C118
RTCA Compliance: DO-160C FA-AC(CLMY)XSFDFSXXXXXXXL(2A)X Finish: Gloss White (17925) or Black (37038), Per Fed Std 595A
NY-156 Footprint
Part Number Directional Antenna Description:
805-10003-001 White Antenna
805-10003-002 Black Antenna


- Directional Antenna (TCAS I)

NSN: 5985-01-554-8890

Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

While most TCAS I and TCAS II antennas are manufactured by Sensor Systems for other manufacturers, they all possess different part numbers and models numbers. Some even will indicate a Sensor Systems part number. However, that number indicates proprietary part number and status that Sensor Systems will have with the manufacturers such as Honeywell and L3. You cannot purchase the TCAS antenna with the Sensor Systems part number direct from Sensor Systems.

Regarding interchangeability, there are very similar characteristics between the various TCAS antennas. However, it is not so much the functionality characteristics that determine the interchangeability as it is the certification. That is, since an L3 antenna part number will not be listed in a Honeywell TCAS STC installation manual, you cannot substitute one for the other.
In order for the Skywatch / Skywatch HP NY-156 or NY-164 antenna to fit on specific airframes, an adapter plate may be required. Specific part number installation kits with the necessary adapter plates are available. Please refer to the following chart for aircraft applications and kit part numbers.

See chart below or view in PDF format: NY-156 Antenna Airframe Installation Kits (PDF)