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SDR 99ZZZX2343

Open the Markdown

Service difficulty report · Shaft

FAA SDR system

Difficulty date
May 27, 1999
Submitted
March 26, 2000
Operation
General aviation
Engine
Allsn 250C20R1
System (JASC)
7250 · Turbine Section
Part
Shaft
Part number
230374
Condition
Corroded
Location
Engine
Stage of operation
IN
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

POWER TURBINE OUTER SHAFT HAS SEVERE DEEP CORROSION AT DIMPLES AND CURVIC COUPLING. CORROSION AT DIMPLES 360 DEGREES AROUND AND OVER HALF AS DEEP AS THE DIMPLE. SEVERAL CURVIC CORRODED TOPS, INSIDE AND OUT. PT INNER SHAFT - THE FIRST .25 INCH OF THREAD CORRODED AND NICKLE LIFTED AND MISSING FORWARD OF THREADS AND CORROSION PITTED.