AGR-74-15 series 2

AGR-74-15 Series 2 attitude indicator in flight instruments

The AGR-74-15 Series 2 is a gyroscopic attitude indicator used in aircraft flight and navigation instrument systems. The instrument gives the crew a visual reference of the aircraft position relative to the true horizon, showing pitch and roll directly on the cockpit panel. This is one of the basic instruments used for attitude awareness, especially when outside visual references are limited. In normal operation, the pilot reads the aircraft bank and nose-up or nose-down position from the display, while the gyroscopic mechanism keeps the indication aligned with the horizon reference.

Roll and pitch indication on AGR-74-15 Series 2

The AGR-74-15 Series 2 displays roll and pitch angles over the ranges required for aircraft attitude monitoring. Roll indication covers a full rotation range, while pitch indication is limited by the instrument’s design and installation geometry. The display is intended to be clear and readable during standard flight conditions, maneuvers, climb, descent, and turns. For the crew, the value of this instrument is in its directness: it does not require interpretation through a separate system page or external display, but gives immediate attitude information in the instrument panel field of view.

AGR-74-15 Series 2 signal output for onboard systems

Besides visual indication, the AGR-74-15 Series 2 generates alternating-current electrical output signals proportional to roll angle. These signals can be used by external aircraft circuits that require attitude-related information from the instrument. This makes the unit more than a standalone cockpit indicator. It also becomes part of the wider avionics and flight instrument architecture, where roll information may be transferred to connected equipment depending on the aircraft configuration. The exact use of these output signals must be checked against the aircraft wiring diagram and instrument system documentation.

Aircraft application of AGR-74-15 Series 2

The AGR-74-15 Series 2 is used on both fixed-wing aircraft and helicopters. It is associated with aircraft such as An-28, An-38, An-72, An-74, An-124, An-140 and Tu-154M, as well as Mi-17 and Mi-8AMT helicopter applications. In these installations, the instrument is mounted in the cockpit panel as part of the standard flight instrument set. Before replacement, the exact aircraft model, panel layout, power supply, connector version, and system wiring should be checked, because similar attitude indicators can differ in execution, signal interface, or installation details.

Failure warning system of AGR-74-15 Series 2

The AGR-74-15 Series 2 includes a failure warning indication. If the instrument loses reliable operation or a monitored failure condition occurs, a warning flag appears in the pitch scale field of view. This gives the crew a direct visual cue that the attitude indication should not be trusted without cross-checking other instruments. The warning function is especially important because an attitude indicator is often used in reduced visibility or instrument flight conditions. A readable failure flag helps prevent the pilot from relying on a faulty horizon reference.

Power supply and lighting of AGR-74-15 Series 2

The instrument operates from a three-phase alternating-current power supply and has a separate lighting power input for cockpit illumination. The lighting circuit may be AC or DC depending on aircraft wiring. This separation allows the gyroscopic mechanism and the panel lighting to be powered through their appropriate aircraft circuits. During inspection or troubleshooting, it is important to distinguish between failure of the gyro power supply, failure of the indication mechanism, and failure of the lighting circuit. A dark instrument is not always the same fault as a failed gyroscope.

Maintenance and identification of AGR-74-15 Series 2

For supply, repair, or replacement, the full designation AGR-74-15 Series 2 should be used. The instrument should be checked by condition, documentation, calibration status, and compatibility with the required aircraft type. Since the unit contains a gyroscopic assembly, storage history and test results matter. Before installation, technicians normally check external condition, connector condition, warning flag operation, lighting, instrument response, and documentation availability. For aircraft use, the item should be supplied with technical documentation, passport, repair records, or test documentation depending on its condition and source.

Product Type: Gyroscopic attitude indicator
Designation: AGR-74-15 Series 2
Function: Visual indication of roll and pitch angles; generation of AC output signals proportional to roll angle
Application / Where Used: Flight and navigation instrument systems
System / Installation Area: Aircraft cockpit instrument panel and onboard avionics systems
Compatible Aircraft / Equipment: An-28, An-38, An-72, An-74, An-124, An-140, Tu-154M; Mi-17, Mi-8AMT
Indication Principle: Gyroscopic attitude reference
Roll Range: ±360°
Pitch Range: ±85°, excluding instrument panel inclination
Power Supply: Three-phase AC, 400 ±20 Hz
Supply Voltage: 36 V +1.8 / −3.6 V
Current Consumption: Not more than 0.4 A per phase
Lighting Power Supply: AC or DC
Lighting Voltage: 2–6 V
Failure Warning Indication: Warning flag in the pitch scale field of view
Failure Warning Time at Bank Angle Below 8°: 1.6 s
Failure Warning Time at Bank Angle Above 8°: 0–3 s
Indication Error on Rocking Base: Not more than ±1.5°
Weight: Not more than 2.5 kg
Instrument Weight: 4.5 kg
Supply Set Weight: 8.0 kg
Technical Documentation: Technical documentation available upon request

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