SDR CA030527009

Service difficulty report · Shaft · Bolkms BO105C

Difficulty date: May 3, 2003
Submitted: June 16, 2003
Operation: Air carrier
Make and model: Bolkms BO105C
Aircraft time: 5,187 hours
Engine: Allsn 250C20B
System (JASC): 7321 · Fuel Control/Turbine Engines
Part: Shaft
Condition: Sheared
Location: Fuel Control
Component: Fuel Control · Bendix
Component part number: 2524644
Stage of operation: DE
How discovered: O
Nature of condition: W
Precautionary procedure: O

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

What was found

(CAN) ONE MINUTE AFTER TAKEOFF DURING A FLIGHT TEST FOR COMPRESSOR STALL, THE NR 2 ENGINE OVER SPEED. THE AIRCRAFT FLEW BACK TO BASE IMMEDIATELY WITH NO FURTHER INCIDENT. THE ENGINE WAS REMOVED FROM THE AIRCRAFT. WHEN THE FCU WAS REMOVED IT WAS NOTICED THAT THE SHAFT WAS SHEARED. IT WAS ALSO FOUND THAT ONE WASHER BETWEEN FCU & GEARBOX WAS NOT INSTALLED. THIS MAY HAVE LED TO THE FCU SHAFT SHEARING. A NEW FCU WAS INSTALLED AND THE ENGINE RAN NORMALLY.