SDR CA071204008

Service difficulty report · Bearing · Skrsky S61N

Difficulty date: November 29, 2007
Submitted: January 21, 2008
Operation: General aviation
Make and model: Skrsky S61N
Aircraft time: 44,041 hours
Engine: Ge CT581402
System (JASC): 6520 · Tail Rotor Gearbox
Part: Bearing
Condition: Overheated
Location: Gearbox
Component: Gearbox · S613566300
Stage of operation: TX
How discovered: O
Nature of condition: B
Precautionary procedure: C

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

What was found

(CAN) ON FIRST FLIGHT OF THE DAY, AIRCRAFT WAS GROUND TAXIING TO TAKE OFF AREA WHEN GROUND CREW NOTICED SMOKE FROM TAIL ROTOR DRIVE INTERMEDIATE GEAR BOX AREA. AIRCRAFT WAS SHUT DOWN, AND INSPECTION REVEALED OVERHEATING IN THE INPUT BEARING AREA. SIKORSKY AND OVERHAUL SHOPS ADVISED, AND ARE INVESTIGATING CAUSE. THIS IS A REOCCURANCE OF PREVIOUS FAILURE. IN BOTH CASES GEAR BOX OIL LEVEL WAS FOUND TO BE SATISFACTORY. (TC# 20071204008)