Safetying of Turnbuckles on Civil Aircraft

AC 20-45 · FAA

Public domain · FAAAdvisory Circulars

Overview

The Safetying of Turnbuckles on Civil Aircraft (AC 20-45) is a public-domain FAA advisory circular, republished here as a free chaptered HTML edition with a linked table of contents and the official PDF.

Publisher: FAA
Document: AC 20-45
Pages: 1

Key points

The document AC 20-45 provides information on acceptable turnbuckle safetying methods for civil aircraft.
Approved safetying devices include clip locking devices specified in military standard MS 33736.
Double-wrap safety wire as specified in military standard MS 33591 is also an approved method.
Turnbuckle safetying devices meeting TS0-C21 are acceptable for use in civil aircraft.
The advisory circular was published by the FAA and is effective from September 17, 1965.

Frequently asked questions

What is the purpose of AC 20-45?

The purpose of AC 20-45 is to provide information on turnbuckle safetying methods that have been found acceptable by the Agency during past aircraft type certification programs.

What safetying devices are approved for use in civil aircraft?

The approved safetying devices include clip locking devices specified in military standard MS 33736, double-wrap safety wire as specified in military standard MS 33591, and turnbuckle safetying devices meeting TS0-C21.

When was AC 20-45 published?

AC 20-45 was published by the FAA and is effective from September 17, 1965.

Who issued the AC 20-45 document?

The document was issued by the Federal Aviation Agency, specifically by the Director of the Flight Standards Service.

What regulations govern the safetying of turnbuckles?

The safetying methods mentioned in AC 20-45 are approved under current airworthiness regulations.

Document

AC NO: 20-45

Federal Aviation Agency

AIRCRAFT EFFECTIVE : 9/17/65 SU 8 J EC T : SAFETYING OF TURNBUCKLES ON CIVIL AIRCRAFT 1. PURPOSE. To provide information on turnbuckle safetying methods that have been found acceptable by the Agency during past aircraft type certification programs.

2. INFORMATION. The following cable system turnbuckle safetying devices have been approved, under current airworthiness regulations, for use in civil aircraft: a. Clip locking devices specified in military standard MS 33736; b. Double-wrap safety wire as specified in military standard MS 33591; and c. Turnbuckle safetying devices meeting TS0-C21.