# AD 77-04-08: Spar Brackets

- Type: Airworthiness directive
- Status: Current
- Products: M7 Aerospace SA26-AT and SA26-T
- Effective: March 1, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-2840
- Registered aircraft: 9 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AA19B32C9BA1CBC08625698400723A8B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-04-08

## The airworthiness directive

77-04-08 SWEARINGEN : Amendment 39-2840. Applies to Models SA26-T and SA26-AT.

Compliance required as indicated.

To prevent failures of spar brackets, P/N 26-31060-1, 26-31060-3, 26-31063-1, and 26-31063-3, accomplish the following inspections and modifications:

  (a) Within the next ten flight hours, unless already accomplished within the last 100 flight hours, inspect the spar brackets in accordance with Swearingen Aviation Corporation Service Bulletin A57-00-27, revised January 14, 1977, or later FAA approved revisions.

  (b) If cracks were found, before further flight, incorporate repair in accordance with Swearingen Aviation Corporation Service Bulletin A57-00-27, revised January 14, 1977, or later FAA approved revisions.

  (c) If no cracks are found at initial inspection, inspect the aircraft each 100 flight hours thereafter or until the repair is incorporated.

  (d) Alternate methods of spar bracket repair must be approved by the Chief, Engineering and Manufacturing Branch, Southwest Region, FAA.

This amendment becomes effective March 1, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A5SW](https://openairdocs.org/tcds/A5SW): Ontic Engineering and Manufacturing Inc.; names 2 of 7 models: SA26-AT, SA26-T

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 9 (9 by airframe model, 0 by engine model)
- Makers: Swearingen 9

Models with the most aircraft:

- [Swearingen SA-26AT](https://openairdocs.org/model/swearingen-sa-26at): 9 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/77-04-08/models.md
Every aircraft: https://openairdocs.org/ad/77-04-08/aircraft.md

Its text cites no advisory circulars or STCs.

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