ISO 1021-1980 PDF

Full title and description

ISO 1021:1980 — Aircraft — Engine nacelle fire extinguisher apertures and doors. This International Standard specifies the shape and minimum/maximum dimensions of openings provided in engine nacelles for insertion of nozzles from ground fire‑extinguishing equipment (round or square openings and their dimensional limits).

Abstract

The standard defines requirements for apertures and doors in aircraft engine nacelles used to accept nozzles of ground fire‑extinguishing apparatus. Where openings are provided they shall be either round or square: round openings with diameter between 100 mm and 130 mm, or square openings with side lengths between 100 mm and 130 mm. The document is concise (single‑page technical prescription).

General information

• Status: Published (International Standard; confirmed through ISO catalogue lifecycle reviews).
• Publication date: October 1980 (1980-10).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 49.100 (Aerospace vehicles).
• Edition / version: Edition 1 (ISO 1021:1980).
• Number of pages: 1.

Scope

This standard applies to engine nacelles of aircraft and sets out the required form and dimensional limits for any fire‑extinguisher nozzle access openings or doors intended to receive ground‑based extinguishing nozzles. It is focused solely on the geometrical definition of those apertures (shape and size) to ensure compatibility with ground equipment.

Key topics and requirements

• Definition of acceptable aperture shapes: round or square.
• Dimensional limits for round openings: diameter between 100 mm and 130 mm.
• Dimensional limits for square openings: side length between 100 mm and 130 mm.
• Requirement that openings be suitable for insertion of nozzles from ground fire‑extinguishing equipment (interoperability/compatibility focus).
• Concise technical prescription (single‑page specification intended for incorporation into design/certification documentation where applicable).

Typical use and users

Used by aircraft designers and OEMs when detailing engine nacelle access for fire suppression, by maintenance organisations and ground handling teams to verify compatibility with ground extinguisher nozzles, and by certification authorities and independent inspectors as a normative dimensional reference for nacelle openings.

Related standards

ISO 1021:1980 is one of a range of aerospace/aircraft-related ISO standards. Nearby numbered standards cover other aircraft items and connectors; see related entries such as ISO 1022 (gaseous oxygen replenishment connection) and ISO 1023 (high pressure air charging valves) for context among early aerospace standards.

Keywords

engine nacelle, fire extinguisher aperture, fire‑extinguishing nozzle, nacelle door, aircraft safety, dimensional requirements, ISO 1021:1980, aerospace standard.

FAQ

Q: What is this standard?

A: ISO 1021:1980 is an International Standard that specifies shapes and dimensional limits for engine nacelle fire‑extinguisher apertures and doors to accept ground‑based extinguishing nozzles.

Q: What does it cover?

A: It covers the permitted shapes (round or square) and the dimensional ranges for those openings (round diameter 100–130 mm; square sides 100–130 mm) and is intended to ensure compatibility with ground fire‑fighting nozzle equipment.

Q: Who typically uses it?

A: Aircraft designers, OEMs, maintenance organisations, ground handling crews and regulatory/certification bodies use this specification when designing, inspecting or certifying engine nacelle fire‑extinguisher access provisions.

Q: Is it current or superseded?

A: According to the ISO catalogue entry, ISO 1021:1980 is a published International Standard that has been subject to periodic confirmation in the ISO lifecycle; it is not recorded as withdrawn or replaced in the ISO entry and remains listed with lifecycle confirmations (latest confirmation shown in the ISO catalogue). Users should check the ISO catalogue or their national standards body for the absolute latest legal/certification status before quoting it in regulatory or contractual documents.

Q: Is it part of a series?

A: ISO 1021:1980 is an individual aerospace standard within the broader sequence of ISO standards for aircraft and related equipment (other nearby numbers address other aircraft components); it is not a multi‑part series by itself but sits among related aircraft standards.

Q: What are the key keywords?

A: Engine nacelle, fire extinguisher aperture, nacelle door, nozzle insertion, aircraft safety, ISO 1021.