GOST 18977-79 PDF

Full title and description

GOST 18977-79 — Комплексы бортового оборудования самолётов и вертолётов. Типы функциональных связей. Виды и уровни электрических сигналов. Standard establishes types of functional links and the kinds and voltage/temporal levels of electrical signals used in aircraft and helicopter onboard equipment and interfacing devices.

Abstract

This Soviet-era interstate standard (GOST 18977-79, adopted in 1979 and effective from 01 January 1980) defines signal types, levels and basic timing/format requirements for analog, discrete, discrete-analog and serial coded communications between airborne systems and subsystems. It is intended to ensure electrical and functional compatibility of avionics modules and complex onboard equipment.

General information

• Status: Active (действует) — registered and in force since 01.01.1980.
• Publication date: Approved 19 January 1979; effective from 01 January 1980.
• Publisher: Interstate standard (GOST) — approved by the State Committee for Standards (Gosstandart) of the USSR / issued as an interstate standard.
• ICS / categories: 49.090 (Aviation and space technology / avionics).
• Edition / version: Original designation GOST 18977-79 (1979). Replaces GOST 18977-73.
• Number of pages: 10 pages (typical published text length).

Scope

The standard applies to airborne equipment complexes, standalone systems and functionally independent devices (information-measuring systems, indication and alarm systems, control panels and computing means) installed on aircraft and helicopters, and to their interfacing wiring and lines. It specifies permitted signal kinds, levels, timing characteristics and basic connection practices for analog, discrete, discrete‑analog and serial (coded) links used in onboard functional connections.

Key topics and requirements

• Classification of functional link types used in onboard complexes (analog, discrete, discrete‑analog, sequential/serial codes).
• Voltage levels, pulse amplitudes and timing characteristics for analog and discrete signals (specified amplitudes, pulse durations and immunity parameters).
• Requirements for sequential or serial-code links: supported data rates and timing tolerances (specified use of 12.5/48/100 kbit/s and allowance for higher rates such as 250/500/1000 kbit/s under specified conditions).
• Line connection practices: bifilar (twisted pair) lines, separate or common pairs for transmit/receive, load and measuring conditions for interchangeability.
• Definitions and terms used in avionics signal and interface descriptions (included normative appendix with definitions).
• Compatibility and mapping to common avionics interface conventions (used in practice alongside ARINC‑429 style serial coding in Russian aviation equipment).

Typical use and users

Engineers and designers of aircraft and helicopter avionics, systems integrators, test and verification laboratories, equipment manufacturers, maintainers and technical documentation authors use this standard to ensure electrical compatibility and to define interface characteristics during design, production and aircraft wiring/integration. It is also referenced in test equipment, interface modules and avionics maintenance documentation.

Related standards

Commonly referenced standards and specifications in the same domain include: GOST R 52070-2003 (magistral/serial bus requirements), RTM/RTM‑1495 (historical Russian RTM interface specs), ARINC‑429 and other ARINC publications (industry serial data conventions), and international bus standards such as MIL‑STD‑1553B for multiplexed data buses. GOST 19705‑89 (aircraft power systems) and other avionics/system standards are also cross‑referenced.

Keywords

GOST 18977-79; avionics; onboard equipment; functional links; electrical signal levels; serial code; interface; ARINC‑429 (analogue); aircraft wiring; signal timing; USSR GOST.

FAQ

Q: What is this standard?

A: A Soviet/Interstate standard (GOST 18977-79) that defines types of functional links and the varieties and levels of electrical signals used in aircraft and helicopter onboard equipment.

Q: What does it cover?

A: Signal kinds (analog, discrete, discrete‑analog, serial/sequence codes), voltage and timing characteristics, connection practices (twisted pairs, loads, measurement conditions) and basic requirements to ensure interoperability of avionics modules.

Q: Who typically uses it?

A: Avionics designers, equipment manufacturers, integrators, test labs and maintenance engineers working on aircraft and helicopter onboard systems and their interfacing.

Q: Is it current or superseded?

A: The document GOST 18977-79 is listed as active (in force) with an effective date of 01 January 1980; it replaced an earlier 1973 version (GOST 18977-73). For modern projects, users should verify if additional national or industry updates apply (e.g., later GOST‑R or sector-specific regulations).

Q: Is it part of a series?

A: It belongs to a family of Soviet/Russian avionics and aircraft equipment standards (other related GOSTs and normative documents cover system organization, power quality, bus standards and test procedures). It is cross‑referenced with other aviation standards and technical specifications.

Q: What are the key keywords?

A: Avionics, onboard equipment, functional links, electrical signal levels, serial code, interface, GOST, ARINC‑compatible.