065-0085-02

Air-data role in compatible flight control systems

The KDC 222 is associated with compatible BendixKing flight-control installations, including KFC 275 two-axis and KFC 325 three-axis system configurations documented for this equipment family. Its purpose is to provide the autopilot with conditioned information derived from aircraft air-data and dynamic inputs. Those signals allow the connected flight-control computer to perform approved pitch, altitude, airspeed and monitoring functions according to the installed system.

Published equipment data identifies inputs for yaw-gyro excitation, preflight test, lateral acceleration and pitch rate. Listed outputs include lateral acceleration, vertical acceleration, an altitude oscillator, airspeed, G-dump and indicated-airspeed range signals. These descriptions explain the unit's position in the system; they do not replace the aircraft wiring diagram or component maintenance manual, which define the actual pin assignments, signal levels and test limits.

A simplified functional relationship is aircraft pitot/static sources and compatible motion sensors → KDC 222 air-data processing → compatible flight-control computer and monitoring circuits → approved autopilot servos and cockpit indications. The adjoining sensors, computers and servos are related system components, not substitutes for 065-0085-02 and not part of the delivery set unless a quotation states otherwise.

Electrical, pressure and environmental data

The rear interface photograph shows a multipin electrical connector together with pressure ports marked PS and PT. Their connection, hose type, leak-test procedure and approved routing must be confirmed from the installation data. Published specifications list power inputs of +28 VDC, +15 VDC, −15 VDC and +5 VDC, with 10 mA stated for the +5 VDC input. Aircraft-side protection and connector pin allocation are installation-dependent and should not be inferred from the visible hardware alone.

Published dimensions are approximately 3.30 inches wide, 3.08 inches high and 4.40 inches long. The exact identification plate states a weight of 0.97 lb, equivalent to 0.44 kg. The listed operating temperature range is −67 °F to +158 °F, approximately −55 °C to +70 °C, and the published altitude range is up to 55,000 ft. The photographed plate carries TSO C9c and C52a references together with DO-160B environmental qualification marking.

These technical values describe the KDC 222 equipment family and the exact photographed suffix where explicitly stated. Final acceptance must follow the applicable approved manuals, modification status and release documentation. If a test report or aircraft record provides a different limit for a particular installation, the approved aircraft data takes precedence.

Installation and exact-suffix verification

The unit is installed remotely using its base plate and aircraft-specific mounting arrangement. Installation work should confirm secure attachment, connector condition, correct electrical bonding, undamaged pressure fittings, clean pressure lines and the absence of leaks or contamination. Pressure ports must remain capped during storage and transport when appropriate, because moisture or foreign material can affect air-data accuracy and serviceability.

Receiving inspection should verify Part Number 065-0085-02, model KDC 222, serial number, modification marks, the identification plate, enclosure condition, mounting base, multipin connector and both visible pressure ports. Similar housings must not be accepted solely by model name. Known KDC 222 suffixes include other configurations such as 065-0085-01, 065-0085-06, 065-0085-10 and 065-0085-20; their interchangeability requires explicit approved evidence.

After installation, an approved technician should complete the prescribed pitot-static leak checks, electrical checks, preflight-test sequence and applicable flight-control functional tests. A serviceable air-data computer cannot correct faults in aircraft pressure plumbing, sensors, wiring, the autopilot computer or servo system. Troubleshooting therefore needs to consider the full signal path rather than replacing the KDC 222 without diagnosis.

Serviceable partner-stock supply and ordering

This 065-0085-02 KDC 222 is offered in Serviceable condition from partner stock with a six-month warranty. Serviceable describes the stated supply condition; the exact serial number, tag date, release document, modification status and included accessories remain subject to the quotation for the available unit. Product photographs identify the exact component type and suffix but do not promise a particular pictured serialised unit.

For an inquiry, specify Part Number 065-0085-02, model KDC 222, aircraft model and serial number, installed flight-control system, required release documentation, modification requirements and quantity. The complete suffix should be compared with the aircraft equipment list before purchase. Related BendixKing flight-control and navigation components can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Related products may operate in the same system, but they are not represented as interchangeable replacements.