# Proposed AD FAA-2011-1113: Sikorsky Aircraft Corporation (Sikorsky) Model S-92A Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-06-24
- Products: Sikorsky
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 26, 2011, 76 FR 66209
- Comments due: December 27, 2011
- Became: [AD 2012-06-24](https://openairdocs.org/ad/2012-06-24)
- Docket: FAA-2011-1113 (https://www.regulations.gov/docket/FAA-2011-1113, where comments are filed)
- Project: 2009-SW-53-AD
- FR document: 2011-27669
- Official PDF: https://openairdocs.org/files/sha256/db/ee/dbeefe78a8420c6ed5446fb5d19dd659b8c82624dc02956e897c7f504a0289e1 (from https://www.govinfo.gov/content/pkg/FR-2011-10-26/pdf/2011-27669.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/10/26/2011-27669/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-s-92a-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6DB95C46D4ECEC0886257935006FDA1E.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1113

## Summary

This document proposes adopting a new airworthiness directive (AD) for the Sikorsky Model S-92A helicopters. This proposal would require inspecting each tail rotor blade (blade) for mislocated aluminum wire mesh in the blade skin. This proposal is prompted by the discovery that blades were manufactured with aluminum wire mesh mislocated, leaving portions of the graphite torque tube (spar) region unprotected from a lightning strike. This condition can exist in both the upper and lower blade skin airfoils. The actions specified by this proposed AD are intended to detect mislocated blade wire mesh and to prevent spar delamination, loss of the blade tip cap during a lightning strike, blade imbalance, loss of a blade, and subsequent loss of control of the helicopter.

## Notices in this docket

- Oct 26, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-27669, comments due Dec 27, 2011 (https://www.federalregister.gov/documents/2011/10/26/2011-27669/airworthiness-directives-sikorsky-aircraft-corporation-sikorsky-model-s-92a-helicopters)

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