Service difficulty report · Nut

Difficulty date
June 28, 2000
Submitted
January 22, 2001
Operation
General aviation
Engine
Rroyce SPEY5118
Part
Nut
Part number
AS20625
Condition
Damaged
Location
Guide Vane Ring
Part time
6,194 hours, 539 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) THE NUT AS20625 HOLDING THE OUTLET GUIDE VANE RING BETWEEN THE LOW PRESSURE COMPRESSOR ROTOR AND THE HIGH PRESSURE COMPRESSOR ROTOR WAS UNTORQUE AND ENTERED INTO THE HIGH PRESSURE COMPRESSOR ROTOR DAMAGING THE HP COMPRESSOR BLADES. THE BOLT K1861114 ATTACHED BY THE NUT AS20625 HAS DAMAGED THE LP COMPRESSOR ROTOR BLADE STAGE 5 AND ALSO THE LP COMPRESSOR ROTOR DRUM. ENGINE REMOVED AFTER A POST FLIGHT INSPECTION BY THE CUSTOMER. ROLLS ROYCE MOD 5270 WHICH CORRECT THIS PROBLEM, WILL BE RE-EMBODY ON ENGINE, AND TORQUE RE-APPLY AS PER SERVICE BULLETIN. SERVICE BULLETIN SB 72-5270 IS THE STANDARD RE-BUILD FOR SPEY 511-8 AT RRC.