KPP-LK / 1273LK

KPP-LK / 1273LK command flight director indicator

KPP-LK, also known by the industry index 1273LK, is a combined aircraft command flight director indicator used for displaying aircraft attitude and flight director commands. The instrument combines the functions of an attitude indicator and a director indicator for trajectory control systems. It is installed on cockpit instrument panels of aircraft and helicopters where attitude, roll, pitch, slip and command guidance information must be shown directly to the pilot. KPP-LK is a remote indicator and works as part of a larger flight-navigation and automatic control system.

Attitude indication through KPP-LK

The KPP-LK indicator displays the aircraft position relative to the true horizon. It provides visual indication of roll and pitch, allowing the pilot to monitor spatial orientation of the aircraft during normal flight, maneuvering and instrument flight conditions. The pitch scale shows the aircraft’s nose-up and nose-down attitude, while the roll scale provides circular indication with marked angular references. The instrument is used as one of the primary cockpit flight references and is normally placed in the central flight instrument area in front of the pilot.

Flight director function of 1273LK

The 1273LK instrument includes movable command bars used for director flight control. These bars show the pilot the direction and magnitude of required control inputs for maintaining or acquiring the selected flight path. Command signals may come from the automatic flight control system, trajectory control system, landing radio system or onboard navigation computer, depending on the aircraft configuration. The instrument itself does not calculate the flight path; it displays received command information and allows the pilot to follow the director commands visually.

KPP-LK as a remote indicator

KPP-LK is not an autonomous gyro horizon. It does not contain the main gyro reference used to generate aircraft attitude data. Roll and pitch signals are supplied from external sources such as a central gyrovertical, inertial system or onboard flight-navigation computer. Command signals are supplied from the automatic control or trajectory control system. This means that correct operation of the instrument depends on external attitude sensors, power supply, wiring, signal validity and associated control computers. Failure flags on the display warn the crew when selected signals are absent or unreliable.

Cockpit installation of KPP-LK

The KPP-LK is installed on pilot instrument panels in the central flight instrument area. On aircraft with two pilot stations, similar indicators may be installed in front of the captain and copilot. The instrument fits into a standard panel-mounted cylindrical housing with a square front flange. It is normally placed in the main “T” layout of flight instruments together with navigation indicators. Associated attitude sensors and flight control computers are installed separately in avionics compartments, radio equipment bays or technical racks, depending on aircraft type and layout.

Identification and ordering of KPP-LK / 1273LK

KPP-LK belongs to the 1273 series of Soviet / Russian command flight indicators, which also includes related versions such as KPP-K, KPP-MK and KPP-PKE. Before ordering, the exact designation, aircraft type, system configuration, condition and documentation set should be confirmed. The unit may be required for cockpit restoration, flight instrument replacement, overhaul support or spare parts stock. For acceptance, it is useful to clarify passport availability, test records, connector configuration, failure flag operation, lighting circuit condition and compatibility with the aircraft’s gyrovertical and flight director systems.

Product Type: Command flight director indicator / attitude and director indicator
Designation: KPP-LK
Industry Index: 1273LK
Alternative Designations: КПП-ЛК, 1273ЛК, KPP-LK / 1273LK
Function: Indication of aircraft attitude, roll, pitch, slip and flight director commands
Application / Where Used: Aircraft and helicopter flight-navigation systems
System / Installation Area: Cockpit flight instrument panel / attitude and director indication system
Compatible Aircraft / Equipment: Soviet and Russian aircraft and helicopters equipped with compatible 1273-series flight director indication systems
Associated Systems: Flight-navigation complex, automatic flight control system, trajectory control system, central gyrovertical or inertial attitude source
Instrument Type: Remote indicator, not an autonomous gyro horizon
Roll Indication: Circular indication up to 360°
Roll Scale Marking: Up to ±60°, with main marks every 10° and separate references at 30° and 45°
Pitch Indication: Moving pitch scale / drum or tape-type indication
Pitch Display Range: Up to approximately ±80° to ±90°, depending on execution
Roll / Pitch Indication Error: Not more than approximately ±1° to ±1.5° within operating range, excluding external gyro source error
Dynamic Response: Designed for flight-navigation system requirements at angular rates up to 60°/s
Slip Indication: Built-in slip indicator
Failure Flags: Roll / general validity flag, pitch flag and command signal flags depending on version
AC Power Supply: 36 ±3.6 V, 400 ±8 Hz three-phase AC
DC Power Supply: 27 ±2.7 V DC for warning flags and command circuits
Lighting Power Supply: 5.5 ±0.55 V AC or DC for built-in light guide / scale illumination
Front Panel Size: Standard 120 × 120 mm class, approximately 119.5 × 119.5 mm according to applicable standard
Housing Depth: Approximately 230–250 mm
Approximate Weight: 2.5–2.6 kg depending on production series
Installation: Panel-mounted cylindrical housing with front flange
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, aircraft maintenance documentation, wiring diagram and test records if available

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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.