Service difficulty report · Cylinder · Alon A2

Difficulty date
September 30, 2023
Submitted
October 20, 2023
Operation
General aviation
Aircraft
N6557Q
Make and model
Alon A2
Aircraft serial
A57
Engine
Cont O200A
Part
Cylinder
Part number
658188A2BP
Part serial
LB474
Condition
Damaged
Location
Engine
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

WE OVORNOULED LHLS ENGINE WITH FOUR (4), NEW CMI. (CONTINENTAL MOTORS INC) CY!NDER ASSEMBLIES. AL 112. 7 HO<N, WO HAD 10 REPLACE ALL FOUR CYLINDER AUEMBLIOS DUE 10 OIL WEEPING OUT BETWEEN COOIING FINS 11/CUND THE OUTSIDE OWC)S.TE OL WL\EFE U,E E.:J\A\JST VALVE SPRING AND SPRING SEAT MACL1INED AREA WITHIN TNE ROD<ER BOX. WO ALOO OBSENED A BLUE STALN ON THO OUTSIDE OF TLLO INTAKE PORT ON TWO OF THOSO CYLINDER OSSOMBL,OS. FURTHER LNWSLLGATION THROUGH A CTYE PENETRANL NOI INSPECTION, REVEALED THAT TLLO ALUMINUM CYLLNDER HOODS CONCEALED CASTING POROSLLY THAT ALLOWED HOL OD TO MIGRATE ILS WAY THROUGH TNE ALUM.NUM CASTING TO TILE OUTSIDE OF TILE CYLINDER HEAD. AS WELL II TNE OCCUMULATION AL FUEL WRTL1IN U,E INTAKE PORT TO ALSO MIGRATE OUT THROUGH THE POROUS CYLINDOR HEAD CASTING. WO WERE GLWN FOUR (4) NEW MANUFOCTURO REPLACEMENT CYLINDER AUEMBLLES BY CMI. NOW AT 294.2 HOURS Ô€…‘ OF OPERATION. THESE REPLACEMENT CYFLNDOR ASSEMBLIES ARE EXNL>IUNG T11E SAME EVLDENCE OF THE SAME POROSLLY DEFECT AS THE ONG,NAL SOL THESE ANENT CY1LNDER ASSEMBLIES AN, ALSO EXHD>LLLNG 011 SEEPAGE BETWEEN THE STEEL CYLINDER BARREL AND THE ALUMINUM HEAD CONNECTJON IT IS EVIDENT THAT CMIICAT IS HAVING SOVERO QUALITY CONTTOT ISSUES WITHIN U,OJR Ô€‡… MANUFADURING PROCESS OF THESE ALUMINUM CYLINDER HEADS

More about the Alon A2