SDR 2020FA0000043

Service difficulty report · Ring · Robsin R66

Difficulty date: July 18, 2019
Submitted: January 15, 2020
Operation: General aviation
Aircraft: N800VK
Make and model: Robsin R66
Aircraft serial: 0008
Engine: Allsn 250C30
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Ring
Condition: Cracked
Location: Engine
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING AN ANNUAL INSPECTION OF THE AIRFRAME AND 200HR INSPECTION OF THE ENGINE, A CRACK IN THE SLINGER RING DISK OF THE ENGINE SHAFT WELDMENT WAS DISCOVERED. THE CRACK ANIMATES FROM A MANUFACTURING HOLE IN THE SLINGER RING DISK AND MOVES TOWARDS THE CENTER WHERE THE DISK IS WELDED TO THE DRIVE SHAFT. THIS IS AN UPDATED SHAFT AS SPECIFIED IN ROBINSON SERVICE LETTER SL-24 THAT WAS INSTALLED JULY 12,