ISO 11242:1996 航空機—貨物コンテナの圧力均等化要件 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard ISO 11242 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 9, Air cargo and ground equipment.

Annexes A, B and C of this International Standard are for information only.

Introduction

The decrease in ambient pressure with altitude creates a pressure differential between the inside of a cargo container and the outside environment. When the internal volume and/or area of a container are significant, this may, if not properly controlled, result in tremendous forces exerted on the container panels, thus becoming a major flight safety hazard. Incidents were recorded during flight in which overly airtight containers broke down or nearly exploded during climb.

In order to avoid such potentially hazardous situations, it is essential that this problem be clearly identified and taken into account when designing any type of container to be moved regularly or occasionally by air cargo.

1 Scope

Since most modern civil transport aircraft capable of carrying air cargo unit load devices or large-size shipping containers have pressurized cabins and cargo compartments, two different cases must be considered:

• a) normal (low airflow) pressure equalization during climb and descent — from the departure airport pressure down to the cruise flight cabin pressure, up to the landing airport pressure;
• b) emergency (rapid decompression) pressure equalization in the event of a sudden (possibly"explosive") depressurization of the aircraft fuselage occurring at cruise altitude: this case requires very fast (high airflow) pressure equalization between cruise flight cabin pressure and outer ambient pressure.

This International Standard defines the minimum safety requirements to be met by containers used to transport cargo by civil transport aircraft in either case a) or b) above.

The flight safety requirements specified in this International Standard are applicable to the design of

• aircraft containers for general cargo, as covered by
  • • ISO 4118 for non-certified lower deck containers,
  • • ISO 6517 for base-restrained certified containers exclusively for the lower deck of high-capacity aircraft,
  • • ISO 8323 for air/surface intermodal containers,
  • • ISO 10327 for certified containers for air cargo;

• air mode insulated containers, as covered by ISO 8058;

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of I EC and ISO maintain registers of currently valid International Standards.

3 Definitions

For the purposes of this International Standard, the following definitions apply.

Annex С

Bibliography