AG-77-15

AG-77-15 attitude indicator in aircraft instrument systems

The AG-77-15 is a gyroscopic attitude indicator used in flight and navigation instrument systems of aircraft and helicopters. It provides the pilot with visual information about aircraft position relative to the true horizon, showing roll and pitch during normal flight, maneuvering and instrument conditions. The instrument also includes sideslip indication and can generate electrical roll and pitch signals for connected onboard systems. This makes the AG-77-15 both a cockpit flight instrument and a source of attitude-related data for avionics equipment.

Roll, pitch and sideslip indication

The AG-77-15 gives the crew a direct visual reference for spatial orientation. Roll indication is available through the full bank range, while pitch indication shows the aircraft nose-up and nose-down position within the specified limits. Sideslip indication helps the pilot assess whether the aircraft or helicopter is flying in a coordinated condition. These functions are important during turns, climb, descent, approach, maneuvering and flight in poor visibility, where a reliable artificial horizon is needed for safe attitude control.

Electrical output signals from AG-77-15

In addition to visual indication, the AG-77-15 generates electrical signals proportional to roll and pitch angles. Depending on the aircraft installation, these signals may be transmitted to onboard avionics, automatic control equipment, recording systems or other external units. Because of this, the instrument should be checked not only as a panel-mounted indicator, but also as a signal source. If the connected system uses roll or pitch outputs, the condition of connectors, wiring and output accuracy becomes part of the serviceability check.

Gyroscopic assembly and correction system

The AG-77-15 operates through a gyroscopic assembly with a correction system that supports stable indication under changing flight conditions. The instrument is designed to work on a moving aircraft base, where vibration, oscillation, turns and attitude changes are part of normal operation. Its error limits are specified for different conditions, including vibrating and oscillating bases and after 180-degree turns. These parameters are important because an attitude indicator must remain reliable not only during static checks, but also in actual flight dynamics.

Roll limit warning function

The AG-77-15 includes built-in warning indicators for preset bank angle limits. These warnings help alert the crew when the roll angle reaches defined thresholds. This feature is useful during instrument flight, maneuvering and operations where the pilot must monitor attitude closely while also controlling navigation, engine parameters and external conditions. The warning function should be checked during maintenance, because incorrect activation or failure to activate can reduce the operational value of the instrument.

Aircraft application of AG-77-15

The AG-77-15 is used on fixed-wing aircraft and helicopters, including An-28, An-140, Mi-8AMT, Mi-17 and V-3 helicopters depending on the installed flight instrument system. Its exact installation depends on aircraft documentation, panel layout, electrical power supply and onboard system connections. Before replacement, the instrument should be checked against the aircraft parts catalog and technical documentation. Similar gyroscopic indicators may look close externally, but can differ by power supply, output circuits, warning functions and system compatibility.

Supply and documentation for AG-77-15

The AG-77-15 may be supplied new, from storage, repaired, overhauled or serviceable depending on availability. For aircraft use, technical condition and documentation are essential. Before shipment, the unit should be checked for markings, completeness, connector condition, panel mounting condition, warm-up behavior, indication accuracy and warning operation. Technical documentation may be provided on request. For procurement, the request should specify the exact designation AG-77-15, aircraft type, required condition and documentation package.

Product Type: Gyroscopic attitude indicator
Designation: AG-77-15
Cyrillic Designation: АГ-77-15
Function: Visual indication of roll, pitch and sideslip; generation of roll and pitch electrical output signals
Application / Where Used: Flight and navigation instrument systems
System / Installation Area: Aircraft instrument panel and onboard avionics
Compatible Aircraft / Equipment: An-28, An-140 aircraft; Mi-8AMT, Mi-17 and V-3 helicopters
System Role: Attitude indication and output of roll / pitch signals to connected onboard systems
Roll Range: ±360°
Pitch Range: ±85°
Sideslip Indication: Available
Roll Limit Warning Angles: ±(15 ±1.5)°; ±(32 ±2)°
Warm-Up Time: Not more than 3 minutes
Indication Error at Bank Angles Below 8°: Not more than 1.4°
Indication Error at Bank Angles Above 8°: Not more than 0.3°
Indication Error on Oscillating Base: Not more than ±1.5°
Indication Error on Vibrating Base: Not more than ±2.5°
Indication Error After 180° Turns, 3 min: Not more than ±4°
AC Power Supply: Three-phase AC, 36 V (+1.8 / −3.6 V), 400 ±20 Hz
AC Current Consumption, Phases A / B / C: Not more than 0.45 A
DC Power Supply: 27 V DC (+2.4 / −3.0 V)
Overall Dimensions: 107 × 107 × 250 mm
Weight: Not more than 4 kg
Condition: As applicable
Technical Documentation: Technical documentation available upon request

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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.