20 August-19 September 2019

168
Centre electrode on spark plug missing. (611954195)
PISTON
LYCOMING IO540 K1A5 –  ATA 7314 ENGINE FUEL PUMP – PUMP – FAILED. DR 611954119
During taxi, fuel pressure dropped off and engine started to run rough. Defect rectified by replacing engine driven fuel pump. Teardown report has been requested from vendor.
LYCOMING O320 D3G –  ATA 7322 FUEL CONTROL/RECIPROCATING ENGINES – CARBURETTOR – LEAKING. DR 611954142
Carburettor found to be leaking during routine leak check. Further investigation found a hole in the casting between the bottom of the fuel bowl and the lower throttle body area.
Carburettor replaced with serviceable item.
LYCOMING IO540 M1A5 –  ATA 8520 RECIPROCATING ENGINE POWER SECTION – CYLINDER – LOW COMPRESSION. DR 611954157
During inspection, cylinder compression #1 check failed. Cylinder removed and a crack was found in inlet port extending from inlet seat. There were signs of pre-ignition / detonation as well.

Could be possible issue with fuel and high CHT ops. Have amended company operations to reduce CHT.

LYCOMING IO540 AE1A5 –  ATA 8520 RECIPROCATING ENGINE POWER SECTION – CYLINDER – LOW COMPRESSION. DR 611954158
#1-cylinder compression checked – cylinder failed. Cylinder cracked at inlet port originating at valve seat.
LYCOMING O320 E2D –  ATA 7421 SPARK PLUG/IGNITER  – SPARK PLUG – FAULTY. DR 611954195
Engine rough running.

Centre electrode on no. 4 lower spark plug missing, combined with fouling of no. 4 top plug, it resulted in cylinder not firing correctly.

Resolution: No.4 top spark plug cleared of debris; lower spark plug replaced.

Engine ground runs carried out, nil defects evident, engine ops normal.

CONTINENTAL GTSIO520 M –  ATA 8550 RECIPROCATING ENGINE INTERNAL OIL SYSTEM  – OIL LINE – CRACKED AND LEAKING. DR 611954201
While conducting aerial survey, excessive oil was observed on the right hand engine cowling. Engine was shutdown as a precaution.

Root cause: Cracked inlet oil pipe.

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