066-4010-12

066-4010-12 BendixKing KNS 81 navigation unit

066-4010-12 is the exact Part Number for this BendixKing KNS 81 integrated VOR, localizer and RNAV navigation unit with glideslope capability. The panel-mounted equipment combines radio-navigation reception, area-navigation computation, waypoint entry and crew controls in one enclosure. This exact suffix is identified with a black panel, non-glare lens and ten-waypoint navigation-bus configuration.

The KNS 81 does not contain a DME transponder. Its RNAV solution requires distance information from a compatible external DME together with bearing or radial information from the internal VOR receiver and the entered waypoint data. A similar front panel or the common KNS 81 name is not enough for replacement; the complete suffix, navigation bus, lens, lighting, connector and approved installation must be verified.

VOR, localizer, glideslope and RNAV functions

The unit tunes VOR and localizer frequencies, receives glideslope guidance and allows the crew to define RNAV waypoints by bearing and distance from a selected station. Published operating data describe VOR and localizer coverage from 108.00 to 117.95 MHz in 50 kHz steps. Glideslope coverage is 329.15 to 335.00 MHz with 150 kHz channel spacing.

Four VOR or localizer frequencies and four waypoint definitions can be stored in internal memory for crew recall. The exact -12 version also supports the documented ten-waypoint navigation bus used by compatible external equipment. Front controls select frequency, radial, channel and data entry functions, while the display presents the active information and annunciates the chosen mode.

When a localizer is selected, the navigation source supplies lateral approach guidance, and the glideslope receiver supplies vertical deviation when a valid paired signal is available. RNAV mode mathematically relocates the reference point using VOR bearing and external DME distance. The approved indicator presents the resulting course-deviation and flag information.

External DME and indicator signal chain

A simplified RNAV path is VOR station reception plus external DME range → KNS 81 waypoint computation → compatible course-deviation indicator or flight-control interface. The KNS 81 supplies navigation information but depends on correct antenna paths, the external DME, indicator wiring and aircraft configuration. Loss of DME can make the area-navigation solution invalid even if VOR reception remains normal.

Associated equipment may include a compatible DME, NAV antenna or splitter, glideslope antenna path, course-deviation indicator and approved autopilot interface. These are related components and are not included with the individual KNS 81 unless the quotation specifically lists them. They are not interchangeable with 066-4010-12.

Troubleshooting should check receiver sensitivity, frequency accuracy, waypoint memory, VOR bearing, localizer and glideslope deviation, DME data, warning flags, navigation-bus operation, lighting, power and connector continuity. An RNAV error may originate in station geometry, DME data, antenna cabling or the indicator rather than the KNS 81 computer.

Electrical and physical installation

Published specifications list operation from an 11 to 33 VDC aircraft supply with approximately 15 W power consumption and a weight of about 5 lb, or 2.27 kg. The display uses automatic dimming for changing cockpit light. The exact -12 configuration has a black panel and non-glare lens, details that should be retained when matching the installed cockpit.

Installation requires the approved rack, mating connector, antenna and DME interfaces, circuit protection, bonding and cooling clearance. Receiving inspection should confirm Part Number 066-4010-12, model KNS 81, serial number, black panel, lens, display, knobs, buttons, connector, rack condition and modification markings. The applicable aircraft and KNS 81 data control pin assignments and any required suppression or antenna arrangements.

Published qualification references include TSO C40a for VOR, C36c for localizer and C34c for glideslope. These approvals describe the equipment function; they do not make the unit eligible for an aircraft without the appropriate installation approval and operational configuration.

Overhauled partner-stock supply and ordering

This 066-4010-12 KNS 81 is offered in Overhauled condition from partner stock with a six-month warranty. The overhaul organisation, work scope, release authority, serial number, tag date and traceability are confirmed for the allocated unit before order acceptance. Database or software subscription is not applicable in the manner of a modern GPS, but installation configuration and memory functions still require functional verification.

For an inquiry, specify Part Number 066-4010-12, model KNS 81, aircraft type, external DME, indicator, required ten-waypoint bus, rack or connector, release documents and quantity. Related navigation equipment can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Related products may work in the same signal chain without being direct replacements.

Product Type: Integrated VOR / localizer / RNAV navigation unit with glideslope

Manufacturer: BendixKing / Honeywell

Model: KNS 81

Designation: 066-4010-12

Alternative Designations: 066040100012; 066401012; KNS81; KNS-81

Exact Panel Configuration: Black panel

Exact Lens Configuration: Non-glare lens

Exact Navigation Bus: Ten-waypoint navigation bus

Primary Functions: VOR, localizer, glideslope and waypoint-based RNAV navigation

VOR / Localizer Frequency Range: 108.00 to 117.95 MHz

VOR / Localizer Channel Spacing: 50 kHz

Glideslope Frequency Range: 329.15 to 335.00 MHz

Glideslope Channel Spacing: 150 kHz

Stored Frequencies: 4 VOR / localizer frequencies

Stored Waypoints: 4 internally stored waypoint definitions

External Distance Source: Compatible external DME required for RNAV distance information

DC Power Supply: 11 to 33 VDC

Power Consumption: Approximately 15 W

Published Weight: Approximately 5 lb / 2.27 kg

Display Dimming: Automatic photocell-assisted dimming

Typical Signal Chain: VOR reception plus external DME → KNS 81 RNAV computation → compatible navigation indicator

Qualification References: TSO C40a, C36c and C34c

Interchangeability: Verify complete suffix, navigation bus, lens, panel, connector, rack and aircraft approval

Condition: Overhauled

Warranty: 6 Months

Technical Documentation: Applicable BendixKing KNS 81 installation and maintenance data

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In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.