# Proposed AD FAA-2007-28691: Eurocopter France Model AS355E, F, F1, F2, and N Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-24-04
- Products: Eurocopter France
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: June 30, 2008, 73 FR 36821
- Comments due: August 29, 2008
- Became: [AD 2008-24-04](https://openairdocs.org/ad/2008-24-04)
- Docket: FAA-2007-28691 (https://www.regulations.gov/docket/FAA-2007-28691, where comments are filed)
- Project: 2006-SW-22-AD
- FR document: E8-14723
- Official PDF: https://openairdocs.org/files/sha256/62/a8/62a8f1ba5839d1da96c76ec0dee44255139dc6af393c974f7d2ee8633a6712ed (from https://www.govinfo.gov/content/pkg/FR-2008-06-30/pdf/E8-14723.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/06/30/E8-14723/airworthiness-directives-eurocopter-france-model-as355e-f-f1-f2-and-n-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AB1CBD4F1F457E038625747800487274.0001
- Page: https://openairdocs.org/proposed/FAA-2007-28691

## Summary

This document revises an earlier proposed superseding airworthiness directive (AD) for the specified Eurocopter France (ECF) model helicopters. That AD currently requires certain checks of the magnetic chip detector plug (chip detector) and the main gearbox (MGB) oil-sight glass, certain inspections of the lubrication pump (pump), and replacing the MGB and the pump with an airworthy MGB and pump, if necessary. Also, the AD requires that before a pump or MGB with any hours time-in-service (TIS) can be installed, it must meet the AD requirements. The earlier proposed superseding AD proposed retaining those requirements but proposed adding all serial-numbered pumps to the applicability. This supplemental proposal is prompted by an improved procedure for detecting oil pump wear earlier and is considered more accurate than the procedure proposed previously. The actions specified by the proposed AD are intended to implement improved procedures to detect a failing MGB oil pump, to prevent failure of the MGB pump, seizure of the MGB, loss of drive to an engine and main rotor, and subsequent loss of control of the helicopter.

## Notices in this docket

- Jul 13, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-13624, comments due Sep 11, 2007 (https://www.federalregister.gov/documents/2007/07/13/E7-13624/airworthiness-directives-eurocopter-france-model-as355e-f-f1-f2-and-n-helicopters)
- Jun 30, 2008: Supplemental notice of proposed rulemaking; reopening of comment period., FR document E8-14723, comments due Aug 29, 2008 (https://www.federalregister.gov/documents/2008/06/30/E8-14723/airworthiness-directives-eurocopter-france-model-as355e-f-f1-f2-and-n-helicopters)

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