Part #: 066-4008-00

Model: KNS-80






Nav System

Part Number :





  • Panel mounted navigation system consisting of VOR/Localizer receiver, DME interrogator, RNAV computer, and glideslope receiver [-00/02 unit]
  • Simultaneously displays distance to station, velocity to station, time to station, and chosen parameter of one of four waypoints
  • 200-channel VOR/LOC receiver
  • 200-channel digital DME
  • VOR/LOC converter
  • Digital RNAV computer with capability for preselection and storage of 4 VOR/LOC frequencies and/or complete RNAV waypoints
  • 40-channel Glideslope receiver (-00 and -02 unit only)
  • Will operate on any voltage from 11 to 33 volts
  • Large Scale Integrated (LSI) circuits used which results in complete unit weighing only 6 lbs. with a low power consumption of 25 watts
  • Automatic dimming circuit for display compensates for changes in ambient light level
  • Models available which DO NOT include glideslope receiver (see table below)
  • Models available with standard, diffused or shiny lens (see table below)
  • Commonly used with KI-206 VOR/GS indicator but can be used with KNI-510/510/B/520/525 or KPI-550A/551A/552/553 Navigation indicators



Size: 6.31"W x 3.0"H x 11.19"L Weight: 6.0 lbs.
Reference Documents: RTCA DO-160, FAA AC 90-45A (Area Nav) Environmental Categories: AASKPZBBA
Temperature Range: -20 to +55C Altitude Range: Up to 35,000 feet
DME Trasnmitter Power: 50W minimum (100W typical) DME Sensitivity: -82dbm (-85 typical)
DME Range: 0-200 nm DME Accuracy: 0 to 99.9nm: +-.2nm; 100 to 200nm: +-.3nm
NAV Frequency Range: 200 channels, 108.00 to 117.95 with 50kHz spacing NAV Sensitivity: 2uv Max. (hard) will provide a flyable course indication
NAV Selectivity : 6db at +-16kHz, 65db at +-40kHz Spurious Responses (NAV): At least 50db down
VOR Accuracy: Typically less than +- 1 deg. error Waypoint Angle (RNAV): Selectable on digital display in .1 deg. increments
Bearing and Distance Accuracy (RNAV): Meets FAA Advisory Circular 90-45A accuracy requirements GS Frequency Range: 40 channel, 329.15 to 335.00MHz with 150KHz spacing
GS Sensitivity: 16uv (hard) for half flag GS Selectivity: >6db @ +-25KHz, >40db @ +-150KHz
Number of Deviation Loads (GS): Up to 5 floating 1000 Ohm loads OBS resolver: 30Hz meeting ARINC requirements
Course Deviation (Output): Up to 5 floating 1000 Ohm loads VOR/LOC Warning Flags: Up to 3 floating 1000 Ohm loads
TO/FROM Indication: Up to 3 floating 200 Ohm loads DME Audio Ouput: 18mw Max. into 500 Ohm
NAV Audio Output: 50mw Max. into 500 Ohm Search Time: 1.0 second nominal
Part Number:  Description:
066-4008-00 Standard version with NAV/RNAV/DME/ILS (glideslope), standard lens
066-4008-01 WIth NAV/RNAV/DME/ NO glideslope, standard lens
066-4008-02 With NAV/RNAV/DME/ILS (glideslope), shiny lens
066-4008-03 With NAV/RNAV/DME/ NO glideslope, shiny lens



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.

Neither the KNS-80 or KNS-81 Nav Systems contain FM immunity. Likewise, there are no modifications or service bulletins that can be incorporated to achieve FM immunity. However, the KNS-81 can be used in conjunction with KA-155 FM filter to achieve FM immunity. KNS-81 units must have Mod 14 to be compatible with the KA-155. KNS-81 units above serial number 8309 already have this mod incorporated. According to Revision 4 of the KA-155 installation manual, the KNS-80 can be used with the KA-155 filter as well.

While external suppression should be connected when a GTX-327 is installed into an aircraft with a DME, the GTX-327 suppression input/output is not compatible with the Bendix/King KN-62, KN-64, and KNS-80. These DMEs have an output only suppression port and can be damaged by the GTX-327 mutual suppression output. Therefore, the suppression pin should be left open. If the suppression line is connected between the GTX-327 and above King DME units then the DME will appear to be inoperative, display will be blank and will not transmit.

Negotiating the exchange price of a unit only limits the allowable repair cap for the core unit. Southeast Aerospace's exchange transactions are based on the return of economically repairable core unit. Once the core is received and evaluated, the core repair cost incurred by SEA cannot exceed 75% of the original exchange price. That is, it cannot cost SEA more than 75% of the original OH/SV exchange price collected from the customer. Therefore, when and if an SEA exchange price is discounted, there is a risk that additional charges may be assessed once the core is returned and evaluated.

The KNS-81 meets TSO C40a (VOR), C36c (LOC), and C34c (Glideslope). The KNS-80 does not meet any TSOs. The VOR/LOC/GS section of the KNS-80 is very similar to that of the KNS-81. The KNS-80 also include integrated DME. The DME section of the KNS-80 is similar to that of a stand-alone KN-64 DME. The KN-64 is not a TSOd DME. Therefore, with the inclusion of the Non-TSO DME, the KNS-80 is not TSOd overall.

It should be noted that although the KNS-80 is not TSOd, it does meet the Area Navigation System specification as per FAA Advisory Circular 90-45A

Although the specific KNS-80 and KNS-81 installation manuals only specify certain King indicators as compatible, there are many different indicators that can be used with these navigation systems. The King installation manuals indicate the following nav indicators as compatible:


(note: the manual does list some much older indicators as well which are obsolete and unsupportable)

In addition, the following indicators will interface and provide the necessary functions for VOR/LOC/GS navigation:

KI-202   (VOR/LOC only)
IND-350   (VOR/LOC only)
IND-350A   (VOR/LOC only)

More or less, any "non-converter" indicator should function properly with the KNS-80 and KNS-81. Please note that it is ultimately the responsibility of the installer to verify system performance, functionality, and airworthiness.