Service difficulty report · Blade

Difficulty date
November 13, 2003
Submitted
January 5, 2004
Operation
General aviation
Engine
Pwa PT6*
Part
Blade
Condition
Failed
Location
Engine
Part time
15,958 hours, 17,932 cycles
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) DAMAGE TO PT COMPONENTS IS SUBSTANTIAL AND MOST ARE CONSIDERED SCRAP. DAMAGE INCLUDES LG NR OF PT2 BLADES (3115863-01) FRACTURED AT BLADE ROOT AND AT PT SHAFT HSG ASSY WHICH HAS MNT FLANGE SEPARATED FROM MAIN BODY OF HSG. ALL COMPONENTS EXCEPT GB ARE SCRAP. AN INTERSTAGE AIR SEAL FAILURE WHERE PART OF ROTATING SEAL FATIGUES AND BREAKS AWAY AND JAMS UP PT2 AIRSEAL CAUSING INNER SEAL TO BE TORN FROM PT2 STATOR AND PIECES INGESTED INTO PT1, PT2 ROTORS CAUSING BLADES TO FRACTURE, WITH OUT OF BALANCE CAUSING PT SHAFT HSG TO FRACTURE WITH MASSIVE DAMAGE RESULTING, PT SHAFT HSG FAILURE, CONSIDERED THAT A PRIMARY FAILURE. FRACTURE AROUND HSG JUST AT FLANGE CORNER RADIUS WAS VERY UNIFORM ALL AROUND.