Part #: 066-1078-10

Model: KNR-634A






Nav Receiver

Part Number :




  • 200-channel navigation receiver
  • 40-channel glidelsope receiver
  • Marker beacon receiver
  • Internal VOR/LOC converter
  • King compatible RMI outputs and 3-wire synchro outputs
  • Models available with different combinations of above features (see table below)
  • Used with KFS-564 and KFS-564A flip-flop frequency selector which displays active and standby frequencies in gas discharge numerics.
  • Can be used with nav indicators such as KNI-582, KPI-552, KPI-553A, KI-206
  • Can be interfaced with any 400 Hz, Electrically Zeroed, ARINC CDI or HSI nav display
  • Serial outputs provided for automatic channeling of King DME systems
  • Superflags for both NAV and Glideslope receivers are compatible with most popular Flight Director / Autopilot systems
  • Accepts ARINC 429 channeling and provides ARINC 429 outputs for use with EFS 10 and ARINC 429 based systems
  • Similar to KNR-634 but DOES include above feature
  • Compliant with ICAO Annex FM immunity requirements for Europe (Units must include Mods 6,8,9 or above serial # 12401)
  • TSO'd
  • 28VDC



Size: 2.5"W x 5.0"H x 11.1"L Weight: 4.0 to 5.4 lb. (depending on model)
NAV Frequency Range: 108.00 MHz to 117.95 MHz in 50 kHz increments Temperature Range: -55C to +70C
TSO Compliance: NAV C40a, DO-153A / LOC C36c, Class D, Cat. II DO-131A / GS C34c, Class D, Cat. II DO-132A / MKR C35d, Category A DO-143 Applicable Documents: RTCA Document DO-160A
Design: All solid-state, electronically tuned by single-crystal digital frequency synthesizer Altitude: To 55,000 feet
Part Number: Description:
066-1078-10 NAV Receiver, Marker Receiver, Glideslope Receiver, XYZ RMI
066-1078-11 NAV Receiver, Glideslope Receiver, XYZ RMI
066-1078-12 NAV Receiver, Marker Receiver, XYZ RMI
066-1078-13 NAV Receiver, XYZ RMI
066-1078-14 NAV Receiver, Marker Receiver, Glideslope Receiver
066-1078-15 NAV Receiver, Glideslope Receiver
066-1078-16 NAV Receiver, Marker Receiver
066-1078-17 NAV Receiver only
NOTE: Same base part number used for all KNR-634 and KNR-634A models


- Nav Receiver

NSN: 5826-01-320-0540

Price Condition Status
- Nav Receiver
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.

None, they represent the same unit. Original King Radio part numbers were 9 digits. For example, 066-3056-01. During the Bendix and King merger (i.e. Bendix/King), a new part numbering system was created that converted these 9 digit part numbers to 12 digits. Therefore, 066-3056-01 became 066-03056-0001. Despite this numbering change, units that were originally from the King Radio design still have the 9 digit part number format on the unit dataplate. The 12 digit format for King units appears to be used for catalog and internal Honeywell purposes only. Therefore, any unit that has a zero in its third to last number (i.e. XXX-XXXX-X0XX) has a 9 digit part number (i.e. XXX-XXXX-XXX) on its dataplate / ID Plate.
Yes. Please follow these instructions to set up the GS needle position in VOR mode.

- Remove power to the KNR-634A unit
- Locate the flat head screw on the lower left side of the unit with the connectors
- Remove the screw and locate the black switch inside (note: switch is delicate)
- For the GS bars to In View in VOR mode, set the switch in the Down position
- For the GS bars to be Out of View in VOR mode, set the switch in the Up position.
In January 1989 Bendix/King changed from a nine digit to a twelve digit part numbering system. The new, larger 12 digit numbers allowed for the inclusion of software version into the last two digits of the part number for certain units in which software changed frequently such as EFIS and TCAS processors. Therefore, the two digits immediately preceding the software version indicate the hardware version of the unit.

Different software versions imply different operational features and/or interface capabilities and software modifications imply software repairs (bug fixes) to insure proper operation of these features and interfaces. Software version upgrades frequently require hardware modifications to the unit. Such hardware modifications accompanying software version upgrades do not necessarily change the hardware version of the unit.

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.

Yes, the only version of the Bendix/King KNR-634A Navigation Receiver still manufactured by Honeywell is Part Number 066-1078-10. This -10 version supersedes all other versions of the KNR-634A. As indicated in the related technical publications, -10 configuration includes the nav receiver, converter, marker beacon receiver, glideslope receiver and XYZ RMI card for RMI output. Earlier versions of the -14 and above did not include the RMI output. All other connections and interfaces remain the same.