AD: Turbomeca | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Most Recent Daily Episodes

Episode Date

Airborne-Monday

Airborne-Tuesday

Airborne-Wednesday Airborne-Thursday

Airborne-Friday

Airborne On YouTube

Airborne-Unlimited-04.01.24

Airborne-Unlimited-04.16.24

Airborne-FlightTraining-04.17.24 Airborne-Unlimited-04.11.24

Airborne-Unlimited-04.12.24

Join Us At 0900ET, Friday, 4/10, for the LIVE Morning Brief.
Watch It LIVE at
www.airborne-live.net

Wed, Feb 17, 2010

AD: Turbomeca

AD NUMBER: 2010-04-07

MANUFACTURER: Turbomeca Arriel 2S1 Turboshaft Engines
SUBJECT: Airworthiness Directive 2010-04-07

SUMMARY: This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

During acceleration up to One Engine Inoperative (OEI) 30-second rating, one event of flight loss of full automatic control occurred on an Arriel 2S1 engine.
The selection of OEI 30-second rating on engine 1 was triggered by the automatic detection of an OEI situation further to a transient deceleration of engine 2. The transient deceleration of engine 2 was caused by the untimely reset of its digital electronic control unit (DECU). Once this reset was completed, engine 2 resumed its nominal operation. Afterwards the aircraft then continued its flight safely with its engine 1 operating in manual control mode.
The loss of full automatic control of engine 1 was caused by loss of steps of the stepper motor controlling the fuel metering valve inside the Hydro-mechanical Unit (HMU).
It has been found that high accelerations, notably up to OEI 30- second rating, increase the risk of loss of steps of the HMU stepper motor.
Therefore, this event has led to the consideration of the following unsafe condition at aircraft level: In-flight loss of full automatic control of the engine induced by the loss of steps of the stepper motor during acceleration up to OEI 30-second rating, further to an actual OEI situation on the other engine (such as a power loss event).

We are issuing this AD to prevent loss of full automatic control of the engine during acceleration up to the OEI 30-second rating. This condition could result in reduced controllability of the helicopter.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/3DF5619F22BDDD70862576CC0051031A?OpenDocument

Advertisement

More News

ANN's Daily Aero-Linx (04.15.24)

Aero Linx: International Flying Farmers IFF is a not-for-profit organization started in 1944 by farmers who were also private pilots. We have members all across the United States a>[...]

Classic Aero-TV: 'No Other Options' -- The Israeli Air Force's Danny Shapira

From 2017 (YouTube Version): Remembrances Of An Israeli Air Force Test Pilot Early in 2016, ANN contributor Maxine Scheer traveled to Israel, where she had the opportunity to sit d>[...]

Aero-News: Quote of the Day (04.15.24)

"We renegotiated what our debt restructuring is on a lot of our debts, mostly with the family. Those debts are going to be converted into equity..." Source: Excerpts from a short v>[...]

Airborne 04.16.24: RV Update, Affordable Flying Expo, Diamond Lil

Also: B-29 Superfortress Reunion, FAA Wants Controllers, Spirit Airlines Pulls Back, Gogo Galileo Van's Aircraft posted a short video recapping the goings-on around their reorganiz>[...]

ANN's Daily Aero-Term (04.16.24): Chart Supplement US

Chart Supplement US A flight information publication designed for use with appropriate IFR or VFR charts which contains data on all airports, seaplane bases, and heliports open to >[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2024 Web Development & Design by Pauli Systems, LC