Service difficulty report · Bolt

Difficulty date
July 23, 2024
Submitted
July 29, 2024
Operation
General aviation
Engine
Cfmint LEAP1A23
Part
Bolt
Part number
SIN110F0
Condition
Undertorqued
Location
Diffuser Nozzle
Component
Diffuser Nozzle · Cfmint
Component part number
AS3236
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

ENGINE SERIAL NUMBER 599634 HAS BEEN INDUCTED AT SAE SQY SHOP FOR A SCHEDULED SHOP VISIT. DURING ENGINE DISASSEMBLY THE MECHANICS DISCOVERED A LACK OF TIGHTENING TORQUE OF THE BOLTS SITUATED INSIDE OF THE COMBUSTOR DIFFUSER NOZZLE ASSY. THIS MODULE IS PART OF THE CORE ENGINE AND IS CONSTITUTED OF THE TWO SUB MODULES SM41 (COMBUSTOR DIFFUSER NOZZLE) AND SM51 (STG1 HPT NOZZLE ASSEMBLY) THAT ARE ATTACHED TOGETHER BY THE SAID BOLTS. 21 OUT OF THE 44 BOLTS WERE FOUND WITH INSUFFICIENT TORQUE. THIS FINDING WAS NOT GENERATED BY SHOP SAE AND A NOTIFICATION HAS BEEN SENT TO CFM ON 25TH JULY 2024. SAE PROPOSE THE CLOSURE OF THIS OCCURRENCE REPORT.