PNP-72-12

PNP-72-12 in the aircraft navigation display system

The PNP-72-12 is a plan navigation indicator used in aircraft flight and navigation complexes. It is an electromechanical combined cockpit instrument that displays the aircraft position and navigation data in the horizontal plane. The unit gives the crew a visual reference for heading, selected course, bearing, range and approach deviation signals. On helicopters such as the Mi-26, Mi-8 and Mi-17, the PNP-72-12 is installed on the pilots’ instrument panels and works as one of the key navigation display instruments in the cockpit.

Navigation information displayed by PNP-72-12

The PNP-72-12 combines the functions of several separate cockpit indicators. It can display current heading, selected course, deviation from the selected flight path, bearing to a radio navigation station, distance to a selected beacon, and course / glide path deviation during approach. This allows the pilot to read several navigation parameters from one instrument instead of monitoring separate heading, radio magnetic, bearing and distance indicators. The display principle is based on a “view from aircraft to ground” presentation, with a moving heading scale.

PNP-72-12 as a combined electromechanical instrument

The PNP-72-12 is an electromechanical, remote-following aviation indicator. It receives analog electrical signals from onboard sensors and navigation systems, then converts them into movement of pointers, scales and deviation indicators. The instrument uses channels based on sine-cosine transformers and operates with 400 Hz signal circuits. This design makes the unit suitable for integration with classic Soviet / Mil helicopter navigation complexes where navigation data is transmitted to cockpit instruments through analog electromechanical channels.

Cockpit installation of PNP-72-12

The PNP-72-12 is installed on the instrument panels of the flight crew. On Mi-26 and Mi-26T helicopters, several PNP-72-12 indicators may be installed: on the captain’s panel, on the co-pilot’s panel and at the navigator’s workstation. In this layout, the unit is normally positioned in the central part of the flight instrument zone, often below the attitude director indicator. On Mi-8 and Mi-17 modifications equipped with suitable flight and navigation complexes, the PNP-72-12 may be installed on the left and right pilot panels and can replace older heading indicators such as UGR-4UK, depending on configuration.

PNP-72-12 during navigation and approach

In flight, the PNP-72-12 helps the crew maintain the required course and monitor deviation from the planned flight path. When working with radio navigation stations or beacons, the instrument displays bearing and distance information. During approach, it can show position relative to course and glide path channels, allowing the pilot to monitor lateral and vertical deviation. The exact indication logic depends on the connected onboard systems and aircraft configuration, but the purpose remains the same: to present essential navigation data in one cockpit instrument.

Built-in test control of PNP-72-12

The PNP-72-12 has a built-in operational test system that allows the crew to check the main scales and indicators directly on board. Test control can verify the operation of heading, azimuth, range and glide path indication channels. This is important because the instrument is used as part of the pilot’s navigation reference. Before flight or during required cockpit checks, the test function helps confirm that the main pointers and display elements respond correctly to test signals.

Supply and identification of PNP-72-12

When ordering or replacing the PNP-72-12, the full designation and modification should be stated clearly. The modification PNP-72-12 is associated with registration number P-06121 and is used on Mi-26 and selected Mi-8 / Mi-17 series helicopters depending on the installed navigation complex. For aircraft installation, the unit should be checked by part number, aircraft equipment list, wiring diagram, connector type, passport documentation and compatibility with the onboard flight and navigation system.

Product Type: Plan navigation indicator / combined aircraft navigation display instrument
Designation: PNP-72-12
Russian Designation: ПНП-72-12
Registration Number: P-06121 / П-06121
Function: Display of aircraft navigation data in the horizontal plane
Application / Where Used: Aircraft flight and navigation complexes
System / Installation Area: Cockpit instrument panel, pilot and navigator workstations depending on aircraft type
Part of System / Included in Set: Flight and navigation complex / pilot-navigation display equipment
Compatible Aircraft / Equipment: Mi-26, Mi-26T, Mi-8, Mi-17 and selected modifications equipped with compatible navigation systems
Instrument Type: Electromechanical, remote-following, analog aircraft indicator
Displayed Parameters: Current heading, selected course, track deviation, radio bearing, distance to beacon, course and glide path deviation during approach
Interface Type: Analog signal interface based on sine-cosine transformers
Sine-Cosine Transformer Channel Supply: 8 V AC, 400 Hz
Current Heading, Selected Course and Track Angle Indication Error: Not more than ±1°
Radio Bearing Indication Error: Not more than ±1°
Course Deviation Sensor Error: Not more than ±1°
Distance Indicator Error: Not more than ±1% of maximum scale value
Course and Glide Path Deviation Indicator Error: Not more than ±10%
Display Principle: “View from aircraft to ground”, moving heading scale
Test Control: Built-in operational test system for heading, azimuth, distance and glide path indication channels
Construction Features: Sealed front housing section for protection from dust and moisture
Known Manufacturer: Ramenskoye Instrument Design / Manufacturing Plant, according to supplied technical description
Typical Installation on Mi-26 / Mi-26T: Captain’s panel, co-pilot’s panel and navigator’s workstation
Typical Installation on Mi-8 / Mi-17: Left and right pilot instrument panels depending on aircraft modification and navigation complex
Possible Replacement Area: May replace older UGR-4UK heading indicators on compatible Mi-8 / Mi-17 configurations
Technical Documentation: Product passport, aircraft wiring diagrams and cockpit equipment documentation as applicable

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