SAE AIR 1329C-2019

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SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely

voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and

suggestions.

recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)

Tel: +1 724-776-4970 (outside USA)

Fax: 724-776-0790

Email: CustomerService@sae.org

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SAE values your input. To provide feedback on this

Technical Report, please visit

http://standards.sae.org/AIR1329C

AEROSPACE

INFORMATION REPORT

AIR1329™

REV. C

Issued 1975-01

Revised 2014-08

Reaffirmed 2019-11

Superseding AIR1329B

(R) Electrical Connectors and Wiring,

Compatibility of

RATIONALE

Revision is required to improve drawing quality, to update connector specification references, to remove crimp tool part

numbers, to add AS95234 and AS29600 sealing information, to add additional wire detail sheets referenced in AS50881,

and to update document format with current SAE guidelines.

1. SCOPE

This SAE Aerospace Information Report (AIR) defines the areas where incompatibility may exist between the selected wire

and the electrical connector in which it is terminated and how to design for compatibility. Refer to ARP914 for a glossary of

connection terms.

1.1 Purpose

This AIR documents the need for a system compatibility analysis between the wire, its termination within the electrical

connector, and the associated contact insertion/extraction tool.

2. APPLICABLE DOCUMENTS

The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications

shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the

event of conflict between the text of this document and references cited herein, the text of this document takes precedence.

Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been

obtained.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or 724-776-4970 (outside USA), www.sae.org.

ARP914 Glossary of Electrical Connection Terms

AS50881 Wiring Aerospace Vehicle

Downloaded from SAE International by Univ of Toronto, Tuesday, September 07, 2021

3. GENERAL

Connectors covered by the Military Specifications listed in Table 1 incorporate crimp rear release contacts and an integral

wire sealing grommet.

The inserts of these connectors are usually made up of two basic materials (see Figure 1):

a. a hard dielectric section which incorporates the contact retaining mechanism in each contact cavity and

b. a rear grommet with wire sealing rings in each contact cavity.

Contact insertion and removal methods are common for the connectors listed in Table 1 and employ a tool to release the

contact retaining device as shown in Figure 1. Most tools are made of a plastic material, inexpensive but fragile especially

for the small size contacts. Caution must be exercised when using these tools to avoid broken tool chips which could remain

in the connector. Correct tool alignment and the avoidance of excessive force will extend tool life as well as protecting the

connector from damage to the rear grommet or retaining clip.

FIGURE 1 - TYPICAL CROSS SECTION OF CONNECTOR CONTACT CAVITY

3.1 Variations in Connector Types

The following defines the areas where variations may exist between one connector specification and another:

a. Contact cavity diameter* hard dielectric: This diameter is slightly larger for a given contact than the shoulder of that

contact.

*rear of cavity

b. Wire seal cavity - sealing area: The sealing cavity accommodates a given contact size, and range of finished wire

diameters.

b. Contact geometry - barrel - shoulder diameters: The barrel plus the thickness of the tool must be compatible with the

shoulder diameter of that contact.

d. Insertion/extraction tool - thickness: The O.D. of the wire plus tool thickness must be compatible with the rear I.D. of

the contact cavity.

SAE INTERNATIONAL

AIR1329™C

2 OF 6

Downloaded from SAE International by Univ of Toronto, Tuesday, September 07, 2021

3.2 Incompatibilities

Variations in the above areas, which do exist from one specification to another, can result in difficulties with the removal of

a wired contact or lack of wire seal. This incompatibility will most often occur when the same wire is terminated at one end

with one connector and at the other end with a different type or different contact size.

For example: A wire selected to seal with connector B of Figure 2 may be too small to seal with connector A. On the other

hand, a wire selected to seal with connector A may be too large for the contact extraction tool used with connector B. Also,

if the wire selected is larger than the I.D. of a given tool, it will increase the O.D. of the tool tip which must enter the contact

cavity. The reverse is also true. If the diameter of the wire is significantly smaller than the I.D. of the tool, the I.D. of the tool

can be compressed by the wire sealing rings, making it difficult to lead the tool over the rear of the contact crimp barrel.

FIGURE 2 - TYPICAL WIRING HARNESS CONCEPT

In the first case, the small wire can be locally increased in diameter to obtain a seal but if the wire is too large, it will be

virtually impossible to remove the wired contact unless special techniques are employed.

Also, oversize wire can cause, with some connectors, undesirable expansion of the sealing grommet. This can result in

interference with assembly hardware, prevent insertion/extraction of the contact, or damage the grommet, degrading the

connector's environmental characteristics.

The use of supplementary insulation to build up wires to the recommended sealing range can cause maintenance problems

and is not recommended. Refer to the applicable revision of AS50881 for connector/wire compatibility requirements.

3.3 Solutions

To avoid these pitfalls, the designer should establish the allowable minimum-maximum diameter of a finished wire. This can

be done through a complete analysis of all the connectors required for the wiring harness system. To accomplish this the

designer must examine the wire sealing ranges of each connector type and where applicable, look at the bundle size limits.

Table 1 compares this information for a number of rear release connector types. Table 2 provides finished diameters for a

number of common wire types.

SAE INTERNATIONAL

AIR1329™C

3 OF 6

Downloaded from SAE International by Univ of Toronto, Tuesday, September 07, 2021

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摘要：

SAE AIR 1329C-2019 是由国际自动机工程师学会（SAE International）发布的一项航空航天标准规范，重点针对航空器液氧系统的设计、操作与维护要求进行更新与规范。该标准取代了旧版 AIR 1329B，主要修订内容包括对液氧系统组材料兼容性、安全阀设置、低温流体处理流程以及系统清洁度控制的最新规定，旨在提升航空氧气系统的可靠性与人员操作安全。适用于民航客机、军用运输机及航天发射平台中涉及液氧储供与输送的工程技术人员、质量审核员及设备制造商。遵循 SAE AIR 1329C

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SAE AIR 1329C-2019

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