# AD 55-22-04: Tailplane Main Spar

- Type: Airworthiness directive
- Status: Current
- Products: Vickers-Armstrongs Viscount 745D
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0B013CF7DC644B788625699A005ECA83.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/55-22-04

## The airworthiness directive

55-22-04 VICKERS-ARMSTRONG: Applies to All Viscount Model 745D Aircraft.

Compliance required as indicated.

Cracks have been found in the tailplane center section main spar extending along the lines of rivets attaching the web plate.

Accordingly, Vickers-Armstrong (Aircraft) Ltd. issued Preliminary Technical Leaflet No. 52 dated August 19, 1955, covering this subject. The British Air Registration Board considers Modification D.1384, the initial and repetitive inspections recommended therein mandatory in which the FAA concurs.

Aircraft complying with the limitations specified in PTL No. 52 will be considered serviceable.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 1 of 3 models: Viscount 745D

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.