Service difficulty report · Turbine Blades

Difficulty date
June 3, 2011
Submitted
September 9, 2011
Operation
Air carrier
Engine
Pwa PW121
Part
Turbine Blades
Condition
Damaged
Location
Engine
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

LP BLADE DAMAGE. A VISUAL INSPECTION REVEALED THE FRONT SIDE OF THE LP DISK AND LP BLADE FIR TREE FACES WERE FRETTED AND THE FRONT SIDE OF THE LP DISK AND THE L/E OF THE LP BLADES WERE RIDDLED WITH SMALL IMPACTS (FIGURE 1). THE T/E OF MULTIPLE LP BLADES HAD IMPACT DAMAGE AND ONE LP BLADE HAD A T/E CRACK RESULTING FROM AN IMPACT (FIG 2). VISUAL INSPECTION OF THE T/E OF THE LP STATOR VANES IN-SITU ALSO REVEALED AN EXTENSIVE AMOUNT OF SMALL IMPACTS AND DEBRIS (FIG 3). THE LP STATOR WAS REMOVED FROM THE ENGINE AND UPON REMOVAL IT WAS DETERMINED SOMETHING WAS LOOSE INSIDE THE BAFFLE. THE BAFFLE WAS DISASSEMBLED REVEALING ALL OF THE RIVETS MATING THE RETAINING PLATE TO THE FRONT PORTION OF THE BAFFLE HAD FAILED.