SDR CA011102005

Service difficulty report · Hub · Robsin R44

Difficulty date: August 15, 2001
Submitted: December 12, 2001
Operation: General aviation
Make and model: Robsin R44
Aircraft time: 1,073 hours
Engine: Lyc O540F1B5
System (JASC): 7921 · Engine Oil Cooler
Part: Hub
Part number: C1861
Condition: Cracked
Location: Cooler Fan
Stage of operation: IN
How discovered: V
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

(CAN) PART C186-1 FOUND CRACKED WHILE REPLACING MICROSWITCH V3-1001. THE FAN WAS REMOVED AND THE HUB WAS FOUND CRACKED. THE FAN SHAFT ASSEMBLY C007-5 WAS CORRODED. THE FAN TORQUE WAS FOUND ACCEPTABLE (450-550 FT LBS).\PIECE C186-1 WAS REPLACED AND THE FAN SHAFT C007-5 WAS RETURNED TO ROBINSON FOR OVERHAUL. THE SECOND PROBLEM WAS REPORTED ON 3 OTHER HELICOPTERS IN THE LAST 2/3 YEARS. THE THIRD ONE WAS FOUND CRACK FREE BUT CORRODED.