PNP-72-15

PNP-72-15 as a planned navigation instrument

The PNP-72-15 is an aircraft planned navigation instrument used to display flight and navigation information in the horizontal plane. In Western terminology, this type of unit is close to an HSI, or Horizontal Situation Indicator. The instrument receives electrical signals from onboard navigation, heading and approach systems, and converts them into visual indications on the cockpit display. It allows the crew to monitor aircraft heading, selected course, route deviation, bearing to radio navigation aids and approach guidance information from one combined electromechanical instrument.

Navigation information shown by PNP-72-15

The PNP-72-15 provides pilots with several key indications required for en-route flight, navigation correction and instrument approach. The display can show current aircraft heading, selected course, selected track angle, deviation from the planned flight path and bearing to radio navigation stations such as NDB, outer and inner markers, or VOR depending on the onboard system configuration. The instrument may also show distance information from a connected radio navigation or distance-measuring system. This makes the PNP-72-15 a central cockpit reference for horizontal navigation.

PNP-72-15 in Mi-8 navigation equipment

The PNP-72-15 is used on Mi-8 family helicopters, including Mi-8MTV-1 and other configurations equipped with compatible Soviet/Russian navigation systems. The instrument is part of the flight-navigation equipment set and works together with heading, radio navigation and approach systems installed on the aircraft. Its exact functionality depends on the aircraft configuration and connected equipment. For replacement or supply, the full modification index “-15” must be checked, because PNP-72 instruments exist in several versions with different connector wiring, signal matching and system compatibility.

Electromechanical indication of the PNP-72-15

The PNP-72-15 uses a classic electromechanical round-scale display with moving pointers, flags and manual setting knobs. The indication is built on the “aircraft view to ground” principle, which helps the crew understand the aircraft position relative to the selected course or navigation line. Failure flags give visual warning when certain input signals are not valid or when a connected system is not operating correctly. The design is typical for analog cockpit navigation equipment and remains practical where aircraft are operated with original navigation complexes.

Signals and interfaces of the PNP-72-15

The PNP-72-15 works with analog electrical signals. Depending on the aircraft installation, it may receive data through selsyns, sine-cosine transformers and related signal channels used in the onboard flight-navigation complex. Communication channels are typically powered by 8 V, 400 Hz signals. Because the instrument is not a standalone navigation source, correct operation depends on proper matching with connected sensors, heading systems, radio navigation units and approach equipment. Connector pinout and interface compatibility must be verified before replacing one modification with another.

Built-in control and cockpit operation of PNP-72-15

The PNP-72-15 includes built-in semi-automatic test control for checking moving elements and failure flags before flight. This allows the crew or maintenance personnel to verify basic instrument response without removing the unit from the cockpit. The instrument also has integrated red-white scale lighting for night operation and low-visibility conditions. In practical use, serviceability is evaluated by pointer movement, flag behavior, illumination, mechanical smoothness of setting knobs, and correct response to connected navigation signals.

Supply and interchangeability of PNP-72-15

The modification index is important for the PNP-72 family. Versions such as PNP-72-4M, PNP-72-6M, PNP-72-8 and PNP-72-15 may be similar by appearance, but differ by internal configuration, connector wiring and compatibility with specific navigation complexes. For procurement, the exact designation PNP-72-15 should be stated together with the aircraft type, required condition and documentation. Before installation, the instrument should be checked against the aircraft maintenance documentation, wiring diagram and approved interchangeability data.

Product Type: Planned navigation instrument / horizontal situation indicator
Designation: PNP-72-15
Alternative Designations: ПНП-72-15; PNP-72-15
Function: Display of aircraft heading, selected course, route deviation, bearing and navigation guidance
Application / Where Used: Aircraft and helicopter flight-navigation systems
System / Installation Area: Cockpit navigation instrument panel
Compatible Aircraft / Equipment: Mi-8 family helicopters, including Mi-8MTV-1, and other aircraft with compatible navigation equipment
Instrument Type: Combined electromechanical cockpit navigation indicator
Indication Principle: “Aircraft view to ground”
Display Type: Round electromechanical scale with moving pointers, failure flags and setting knobs
Displayed Parameters: Current heading, selected course, selected track angle, drift angle, route deviation, bearing to navigation stations, distance indication depending on connected system
Approach Guidance: Course and glide path deviation indication depending on aircraft configuration
Signal Type: Analog signals, selsyns and sine-cosine transformers
Communication Channel Voltage: 8 V, 400 Hz
Built-In Test: Semi-automatic test control of moving elements and failure flags
Lighting: Integrated red-white scale lighting for night operation
Front Panel Size: 120 × 120 mm
Instrument Depth: 225 mm
Weight: Not more than 3.6 kg
Heading Indication Accuracy: ±1°
Selected Course Accuracy: ±1°
Selected Track Angle Accuracy: ±1°
Drift Angle Accuracy: ±1°
Distance Indicator Accuracy: Approx. ±0.5 to ±3 km, depending on range and connected system
Course / Glide Path Deviation Error: Not more than 10%
Manufacturer: Ramenskoye Instrument-Making Plant / RPZ
Interchangeability: Must be checked by exact modification, connector pinout and aircraft navigation system configuration

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