071-1210-04

Frequency selection and crew controls

The KFS 586 presents active and standby ADF frequency information and allows the crew to tune the connected KDF 806 receiver. Its mode selector supports the operating positions marked on the front panel, including OFF, BFO, ADF and ANT, while the separate control provides frequency entry and the volume control adjusts received audio. The transfer control exchanges active and standby values in the supported installation.

The display is managed electronically, and the installation manual describes non-volatile storage for active and standby frequencies after power is removed. An automatic dimming circuit adjusts display brightness for ambient conditions. The control head depends on correct power, lighting, data and interconnect wiring to the receiver; a blank display or tuning fault may therefore originate in the control, receiver, harness, supply or grounding.

Connection with the KDF 806 system

The installation manual identifies the KFS 586, P/N 071-1210-XX, as the standard control unit for the KDF 806 receiver. In a typical approved chain, the crew enters frequency and mode commands through the KFS 586, the 066-1077-01 KDF 806 processes signals received through the KA 44B antenna, and compatible bearing outputs are routed to an indicator or EFIS interface. This functional relationship does not make the components interchangeable.

The front display can show an X when valid ADF bearing information is unavailable. This indication should be interpreted through the approved flight manual and maintenance documentation. A complete installation may also include a mounting rack, connectors, circuit protection, audio wiring, indicator wiring and antenna cabling that are not assumed to be supplied with this control unit.

Configuration and installation checks

For exact P/N 071-1210-04, published configuration tables identify a black bezel, 28 V lighting, diffused lens and Mode/On/Off/Volume controls. The photographed rear plate marks TSO C41c Class A, DO-160A environmental reference and a weight of 0.7 lb (0.32 kg). These exact details should be compared with the removed control head and aircraft equipment list before installation.

Technicians should confirm panel cutout, mounting screws, connector keying, pin assignment, lighting circuit and approved interface with the installed KDF 806 version. Similar-looking KFS 586A or alternate-suffix units are not automatically approved substitutes. Bench and aircraft testing must follow the applicable manufacturer procedures.

Overhauled condition and ordering

This 071-1210-04 KFS 586 is offered in Overhauled condition from partner stock with a six-month warranty. Availability, serial allocation and EASA Form 1 documentation are reconfirmed at quotation because partner inventory can change. The published price applies to the stated Part Number and condition.

For a request, specify Part Number 071-1210-04, model KFS 586, quantity, destination and documentation needs. Including the installed KDF 806 receiver Part Number and aircraft configuration helps prevent interface errors. Related avionics are available in the Garmin / BendixKing / Honeywell / Collins category; cross-sell positions are system-related catalog items, not interchangeable replacements.

Pre-installation inspection should also confirm display readability, knob security, connector condition and the absence of unauthorized changes. The release paperwork must identify the same Part Number and serial number as the supplied control.