Service difficulty report · Shaft

Difficulty date
December 23, 2020
Submitted
December 23, 2020
Operation
General aviation
Engine
Rroyce RB211535E4
Engine time
31,795 hours, 11,247 cycles
Part
Shaft
Part number
UL16758
Part serial
DN36575
Condition
Cracked
Location
Stage 2 Dovetail
Part time
31,795 hours, 11,247 cycles
Component
Rroyce
Stage of operation
IN
How discovered
D
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

AS RECEIVED, PREVIOUS BLEND ON THE FORWARD FACE OF DOVETAIL CORNER NR 42 (CLOCK POSITION 3:30) IN SLOT FA WAS FOUND. THE BLEND MEASURES APPROXIMATELY 0.450 CIRCUMFERENTIAL LENGTH, 0.100 RADIAL WIDTH, AND 0.084 AXIAL HEIGHT. THERE APPEARS TO BE ONE THROUGH CRACK PRESENT IN THE BLENDED AREA (TWO INDICATIONS BACK TO BACK) THAT MEASURES 0.208 CIRCUMFERENTIAL LENGTH, LOCATED CENTRALLY ON THE DOVETAIL AND 0.050 DOWN AXIALLY. THE DAMAGE IS FREE FROM HIGH SPOTS AND BURRS. THE COMPONENT IS AT PIECE PART LEVEL AND WAS IN PROCESS UNDERGOING AN OVERHAUL WORKSCOPE AT BARNES AEROSPACE WINDSOR AIRMOTIVE DIVISION (FAA REPAIR STATION KC1R265K) WHEN THIS CONDITION WAS FOUND. THE PART IS CURRENTLY ON HOLD. PLEASE NOTE: ENGINE TSN AND CSN NOT PROVIDED NOR IS TIME SINCE LAST OVERHAUL OR REPAIR. INFORMATION NOT AVAILABLE AT TIME OF SUBMITTAL OF THIS SDR.