Service difficulty report · Blade · Govt N22B

Difficulty date
July 30, 2002
Submitted
November 6, 2002
Operation
Air carrier
Make and model
Govt N22B
Engine
Allsn 250B17B
Propeller
Hartzl HCA3VF7
Part
Blade
Part number
6890502
Condition
Separated
Location
Engine
Part time
2,545 cycles
Stage of operation
CL
How discovered
O
Nature of condition
E, R, J
Precautionary procedure
A

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

What was found

(AUS) LT ENGINE SECOND STAGE COMPRESSOR BLADE SEPARATED FROM WHEEL. INSPECTION FOUND A SMALL STAIN AT THE BLADE STUMP INDICATING THAT A SMALL CRACK HAD BEEN PRESENT FOR SOME TIME. THE CRACKING HAD BEEN INITIATED BY CORROSION PITTING. THE ADJACENT BLADE HAD A SIMILAR CRACK PRESENT. DAMAGE TO COMPRESSOR AND TURBINE. AIRCRAFT OPERATES IN A SALT LADEN ENVIRONMENT BUT HAS REGULAR COMPRESSOR WASHES.