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2012-27-02: High gas generator speed (NG) rating vibration check

FAA order 2012-27-02 is an airworthiness directive in force since February 14, 2013. The FAA's subject line: High gas generator speed (NG) rating vibration check. It names the Turbomeca (Safran) ARRIEL 1B, Turbomeca (Safran) ARRIEL 1C1, Turbomeca (Safran) ARRIEL 1C2, Turbomeca (Safran) ARRIEL 1D1, Turbomeca (Safran) ARRIEL 1E2, Turbomeca (Safran) ARRIEL 1K1, Turbomeca (Safran) ARRIEL 1S, Turbomeca (Safran) ARRIEL 1S1 engines: about 282 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Turbomeca S.A.
Models: Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Engine series: Turbomeca (Safran) ARRIEL 1B 17 aircraft
Turbomeca (Safran) ARRIEL 1C1 2 aircraft
Turbomeca (Safran) ARRIEL 1C2 6 aircraft
Turbomeca (Safran) ARRIEL 1D1 150 aircraft
Turbomeca (Safran) ARRIEL 1E2 101 aircraft
Turbomeca (Safran) ARRIEL 1K1 1 aircraft
Turbomeca (Safran) ARRIEL 1S 1 aircraft
Turbomeca (Safran) ARRIEL 1S1 4 aircraft

Dates and paperwork

In force since: February 14, 2013
Published: January 10, 2013 (signed December 31, 2012)
Docket: FAA-2012-0901
Status: Current
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

We are adopting a new airworthiness directive (AD) for all Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. This AD requires performing a high gas generator speed (NG) rating vibration check. This AD was prompted by several reports of uncommanded in-flight shutdown on [[Page 2199]] Arriel 1 engines. We are issuing this AD to prevent an uncommanded in- flight shutdown of the engine, which could result in an emergency landing.

The order itself the regulatory text, as published

Show the full text (2,187 characters)

Adoption of the Amendment 

	Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: 

PART 39--AIRWORTHINESS DIRECTIVES 

0 1. The authority citation for part 39 continues to read as follows: 

	Authority: 49 U.S.C. 106(g), 40113, 44701. 

Sec.  39.13  [Amended] 

0 2. The FAA amends Sec.  39.13 by adding the following new AD: 

2012-27-02 Turbomeca S.A.: Amendment 39-17314; Docket No. FAA-2012- 0901; Directorate Identifier 2012-NE-19-AD. 

(a) Effective Date 

	This airworthiness directive (AD) becomes effective February 14, 2013. 

(b) Affected ADs 

	None. 

(c) Applicability 

	This AD applies to all Turbomeca S.A. ARRIEL 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines. 

(d) Reason 

	This AD was prompted by several reports of uncommanded in-flight shutdown on Arriel 1 engines. We are issuing this AD to prevent an uncommanded in-flight shutdown of the engine, which could result in an emergency landing. 

(e) Actions and Compliance 

	Unless already done, from the effective date of this AD, do the following. After any Level 3 maintenance action on the gas generator (GG) rotating assembly and before returning the engine to service, accomplish a high GG speed (NG) rating vibration check. 

(f) Definition 

	Level 3 maintenance on the GG rotating assembly is when the Module 03 is removed from the helicopter for implementation of deep maintenance operation to be performed in accordance with the applicable maintenance instructions. 

(g) Alternative Methods of Compliance (AMOCs) 

	The Manager, Engine Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. 

(h) Related Information 

	(1) For more information about this AD, contact Frederick Zink, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; 

[[Page 2200]] 

email: frederick.zink@faa.gov; phone: 781-238-7779; fax: 781-238- 7199. 
	(2) Refer to Mandatory Continuing Airworthiness Information AD 2012-0117, dated July 3, 2012, for related information.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/2012-27-02.json · aircraft systems.