Service difficulty report · Ring · Aerosp ATR72

Difficulty date
December 24, 1998
Submitted
March 26, 2000
Operation
General aviation
Make and model
Aerosp ATR72
Engine
Pwa PW127
Part
Ring
Part number
311237901
Condition
Missing
Location
Combustion Liner
Part time
1,964 hours
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

(CAN) THE ENGINE WAS SENT FOR REPAIR AND INVESTIGATION AFTER A BORESCOPE INSPECTION FOUND THE OUTER COMBUSTION LINER DAMAGED. DISASSEMBLY FOUND THE ENGINE HAD A 1.25 INCH LONG SECTION OF THE MAIN COOLING RING MISSING FROM THE OUTER COMBUSTION LINER. THE INNER COMBUSTION LINER HAD MULTIPLE CIRCUMFERENTIAL CRACKS NEAR THE FORWARD FLANGE SUPPORT RING. THE TRAILING EDGE LIP OF THE HP VANE SEGMENTS HAD CRACKS AND VOIDS ASSOCIATED WITH CORROSION OR HOT GAS DETERIORATION. PART TC: 2,705.