# AC 20-45: Safetying of Turnbuckles on Civil Aircraft

- Type: Advisory circular (guidance, not mandatory unless a rule or AD requires it)
- Status: Current
- Approved: September 17, 1965
- Last reviewed: December 2, 2016
- Family: AC 20-45
- 14 CFR parts: Unknown Part
- Pages: 1
- PDF: https://openairdocs.org/files/sha256/08/43/0843261d76cd9442dd75944d70c4c11f817bef1cdd67d16fed5136032734c43c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C763D786B9D291BC862569B500768F5D.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ac/20-45

## Versions

- [AC 20-45](https://openairdocs.org/ac/20-45) (Current), approved Sep 17, 1965, 1 page

## Text

Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

AC NO: 20-45Federal Aviation Agency

AIRCRAFT EFFECTIVE :

9/17/65 S U 8 JEC 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.

h. ,/2. {~. {_tJJ..l~ G~\;;g~ S. Moore 1 Director Flight Standards Service fi6-.362i

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