Part #:

Model: KFS-594

BendixKing - HF Control (Black - 5v Lighting)
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Part Number :




  • Compact, digital control for use in KHF-950 and KHF-990 HF systems
  • Must be used with KA-594 adapter box for use with KHF-950 System
  • 7-segment gas discharge readouts display all frequencies plus preset channel numbers
  • 19 pilot-programmable channels in addition to all 176 ITU maritime radiotelephone channels in permanent memory
  • Models available with black or gray face plates (see table below)
  • Models available with 5V or 28 volt lighting (see table below)
  • Model available with shiny lens instead of standard, diffused lens (see table below)
  • Photocell adjusts brightness of display




Size: 2.3"W x 2.4"H x 5.8"L Weight: 0.8 lbs.
TSO Compliance: TSO C74c, DO-160A Env Cat A1A/KPS/XXXXXXABAAA Applicable Documents: RTCA DO-163
Temperature Range: -20 to +55C Altitude: Up to 50,000 ft.
Part Number HF Control Display Description:
071-1274-00 5 volt lamps, diffused lens, black bezel
071-1274-01 28 volt lamps, diffused lens, black bezel
071-1274-02 5 volt lamps, diffused lens, gray bezel
071-1274-03 28 volt lamps, diffused lens, gray bezel
071-1274-04 28 volt lamps, shiny lens, black bezel


- HF Control (Gray - 28v Lighting)
Price Condition Status
- HF Control (Gray - 5v Lighting)

NSN: 5826-01-263-8942

Price Condition Status
- HF Control (Black - 5v Lighting)
Price Condition Status
- HF Control (Black - 28v Lighting)

NSN: 5821-01-322-3287

Price Condition Status
- HF Control
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

Yes, but only when used with the KA-594 HF adapter. The KFS-594 control was originally designed for use with the KHF-990 helicopter HF system. The KHF-950 system normally uses the KCU-951 DZUS mount control. Therefore, the KA-594 adapter is not required for use with the KHF-990 system only the KHF-950.
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.
P serial number KHF-950 units are normally initial production units without most recommended service bulletins or product improvements. Most P serial number units still available on the avionics aftermarket are in poor condition and can be very unreliable.
Serial number 1500 and below limits the component interface availability of the system and in the aircraft. That is, all of the units in the system must be below 1500 in order for a complete system to function correctly. In addition, these serial numbers indicate older units which cause reliability issues.
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.
In most cases, a Supplemental Type Certificate is not required for the installation of an HF system. Major changes or alterations to an aircraft may include those which affect weight, balance, structural aspects, reliability, operational characteristics, airworthiness characteristics, etc. Some major alterations can be performed using the FAA Form 337 with approved data. This approved data can be in the form of engineering data with a FAA designee approval (i.e. DER, DAR). The DER or DAR then issues an FAA Form 8110 which is considered approved data adequate to proceed with the installation.

HF installations in the USA are installed and approved in the method detailed above. STCs are not required for almost all HF installations since the change to the existing aircraft Type Certificate (TC) is not so intensive as to require one.
PLEASE NOTE - Publications are for Reference Only