# Proposed AD FAA-2015-0684: Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-20-06
- Products: Viking Air
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 13, 2015, 80 FR 19572
- Comments due: May 28, 2015
- Became: [AD 2015-20-06](https://openairdocs.org/ad/2015-20-06)
- Docket: FAA-2015-0684 (https://www.regulations.gov/docket/FAA-2015-0684, where comments are filed)
- Project: 2014-NM-215-AD
- FR document: 2015-08074
- Official PDF: https://openairdocs.org/files/sha256/4e/e8/4ee8a50516779a49354b75493679405c89ed44c0d742f5d0d73fe3316542bdaf (from https://www.govinfo.gov/content/pkg/FR-2015-04-13/pdf/2015-08074.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/04/13/2015-08074/airworthiness-directives-viking-air-limited-type-certificate-previously-held-by-bombardier-inc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2487FDC94CC7DFD86257E2600473658.0001
- Page: https://openairdocs.org/proposed/FAA-2015-0684

## Summary

We propose to adopt a new airworthiness directive (AD) for all Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Model DHC-7-1 and DHC-7-100 airplanes. This proposed AD was prompted by reports of cracks that were discovered in the outboard nacelles upper longeron channels and angles. This proposed AD would require a one-time detailed visual inspection for cracking in the outboard nacelles upper longeron channels and angles; and repair if necessary. We are proposing this AD to detect and correct cracks in the outboard nacelles upper longeron channels and angles, which could lead to the loss of stiffness in the forward engine mount; and possible catastrophic failure.

## Notices in this docket

- Apr 13, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-08074, comments due May 28, 2015 (https://www.federalregister.gov/documents/2015/04/13/2015-08074/airworthiness-directives-viking-air-limited-type-certificate-previously-held-by-bombardier-inc)

---
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.