<< >> NASA ASRS Report 1741961, April 2020

AS350 instructor reported that during autorotation training; the rotor was oversped; requiring a major inspection for components.

Attributes
ACN	1741961
Time
Date	202004
Local Time Of Day	1201-1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Eurocopter AS 350/355/EC130 - Astar/Twinstar/Ecureuil
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Main Rotor Hub
Person 1
Function	Captain Instructor
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 4950 Flight Crew Type 4950
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

During autorotation training the student pilot undergoing AS350 training allowed the rotor speed to build to a point the high rotor alarm was triggered. Both the student and instructor observed a peak rotor of less than 430 RPM; however; the maintenance page of the vemd read a peak of 458; which required a major inspection of components in accordance with the airbus maintenance manual. Erroring on the side of safety it was decided to go with the worse case scenario and send the components in for inspection.

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Original NASA ASRS Text

Title: AS350 Instructor reported that during autorotation training; the rotor was oversped; requiring a major inspection for components.

Narrative: During autorotation training the student pilot undergoing AS350 training allowed the rotor speed to build to a point the high rotor alarm was triggered. Both the student and instructor observed a peak rotor of less than 430 RPM; however; the maintenance page of the VEMD read a peak of 458; which required a major inspection of components IAW the Airbus Maintenance Manual. Erroring on the side of safety it was decided to go with the worse case scenario and send the components in for inspection.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.