# Proposed AD FAA-2011-0597: Viking Air Limited (Type Certificate No. A-815 Formerly Held by Bombardier Inc. and de Havilland, Inc.) Model DHC-3 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-18-11
- Products: Viking Air
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 10, 2011, 76 FR 34011
- Comments due: July 25, 2011
- Became: [AD 2011-18-11](https://openairdocs.org/ad/2011-18-11)
- Docket: FAA-2011-0597 (https://www.regulations.gov/docket/FAA-2011-0597, where comments are filed)
- Project: 2011-CE-019-AD
- FR document: 2011-14396
- Official PDF: https://openairdocs.org/files/sha256/58/a9/58a9381902019f5c06af04251826ca8d4db16a7c124d7500a4c9388e909e2667 (from https://www.govinfo.gov/content/pkg/FR-2011-06-10/pdf/2011-14396.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/06/10/2011-14396/airworthiness-directives-viking-air-limited-type-certificate-no-a-815-formerly-held-by-bombardier
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3E980F9BE86026CB862578AB00579F6F.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0597

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to the products listed above. The existing AD currently requires repetitively inspecting the elevator control tabs for discrepancies and, if any discrepancies are found, taking necessary corrective actions to bring all discrepancies within acceptable tolerances. The existing AD also requires reporting certain inspection results to the FAA. Since we issued that AD, we determined that we inadvertently omitted certain airplanes from the Applicability section. This proposed AD would retain the actions currently required in AD 2011-05-02 and remove the Supplemental Type Certificate (STC) SA01059SE condition in the Applicability section. We are proposing this AD to add new repetitive inspections of the elevator control tabs. If these inspections are not done, excessive free-play in the elevator control tabs could develop. This condition could lead to loss of tab control linkage and severe elevator flutter.Such elevator flutter could lead to possible loss of control.

## Notices in this docket

- Jun 10, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-14396, comments due Jul 25, 2011 (https://www.federalregister.gov/documents/2011/06/10/2011-14396/airworthiness-directives-viking-air-limited-type-certificate-no-a-815-formerly-held-by-bombardier)

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