13 April – 16 May 2018

409

ROLLS ROYCE BR700 715A130–ATA 7261 TURBINE ENGINE OIL SYSTEM–OIL SYSTEM–INCORRECT FLUID. DR 611851790
L/H engine main oil tank was serviced with Turbo 2380 instead of type 2197. However, it was confirmed that engine was not operated. Oil tank drained and replenished with approved type. Engine ‘idle’ run c/o, ensuring freedom from oil leak. All indications normal.

PRATT AND WHITNEY PT6T 3DF–ATA 7261 TURBINE ENGINE OIL SYSTEM–CHIP DETECTOR–Chip detector light ON. DR 611851792
Number 1 engine chip light illuminated momentarily. Chip detectors inspected for debris. Nil evidence of engine matter on chip detectors as defined by PT6T-3DF-MM. Aircraft ground run and stress tested, no chip detected.

GENERAL ELECTRIC CF6 80E1 A4–ATA 7230 TURBINE ENGINE COMPRESSOR SECTION–TURBINE ENGINE–SURGED. DR 611851799
After take-off, high N2 vibration indicated on engine 1. After several minutes two loud bangs and airframe vibration noticed. Thrust reduced to idle on engine 1, noise and airframe vibration ceased. Uneventful return landing to departing base with engine 1 @ idle thrust. Investigations are continuing.

IAE V2527 A5–ATA 7261 TURBINE ENGINE OIL SYSTEM–De Oiler–Oil leak. DR 611851820
Report of minor dirty sock smell in cabin during descent. Investigation found no 1 engine oil leakage from de-oiler overboard vent. De-oiler seal assembly replaced. Oil also found around APU intake plenum. APU inlet and plenum cleaned, pack burn carried out. A/C declared serviceable and it has flown multiple sectors with no further reports.

PRATT AND WHITNEY PW125 B–ATA 7810 ENGINE COLLECTOR/TAILPIPE/NOZZLE–ACOUSTIC LINER–Adrifted. DR 611851835
Upon engine shutdown, crew encountered an APU fire warning, APU fire extinguishing system resultantly activated. Initial troubleshooting identified APU exhaust silencer inner acoustic liner adrift. Acoustic liner removed, engine operated with no warnings. Investigation has identified that acoustic liner had come adrift due to degradation of the edge welds. Fokker issued Service Experience Digest (SED) number 4980/ 001, ‘APU exhaust silencer repair’, detailing the subject condition. Fokker concluded that the Acoustic Liner is subjected to thermal and chemical degradation over time, which could then lead to the failure of the Liners welds, and in the worst cases, the Liner coming adrift.

TURBOMECA ARRIEL2 D–ATA 7321 FUEL CONTROL/TURBINE ENGINES–HMU–FAILED INSPECTION. DR 611851848
HMU splines failed inspection, IAW AD EASA 2016-0004 (MSB 292 73 2851). Splines were visually stepped. HMU replaced with serviceable item.

PRATT AND WHITNEY PW121–ATA 7261 TURBINE ENGINE OIL SYSTEM–ENGINE OIL–LOW PRESSURE. DR 611851861
During take-off roll, master warning light momentarily illuminated at approximately 60 knots. Take-off was rejected. After confidence check in engine power, static take-off was attempted to ensure the engine gauges were reading within limits. Upon reaching around 60-70 knots, master warning light and associated no 2 ENG OIL PX warning light illuminated followed by oil pressure gauge decreasing through 40 psi. Take-off aborted.
Engineering briefed.

ROLLS ROYCE RB211 972 84–ATA 7321 FUEL CONTROL/TURBINE ENGINES–TURBINE ENGINE–Spooled down. DR 611851873
During cruise engine no 4 spooled down with parameters 18.2% THR, 72% N1, 600C EGT, 82% N2, 83% N3, 1800 FF. Oil T and P were normal. ECAM ‘Auto FLT ENG 4 A/THR OFF’. Fault confirmed per TSM 31-50-00-810-XX. EEC replaced. Engine ground run carried out satisfactory.

IAE V2527 A5–ATA 7261 TURBINE ENGINE OIL SYSTEM–Oil pump–Oil leak. DR 611851895
During engine leak check, leak was evident from oil pump pressure tube at welded P clamp bracket.

LYCOMING LF507 1F–ATA 7261 TURBINE ENGINE OIL SYSTEM–TURBINE ENGINE–CONTAM-METAL. DR 611851896
During early cruise @ FL310, ‘ENG VIB’ caption illuminated. Afterwards ENG no 1 vibes showed 2.8 units. Thereby EGT increased to approx. 824C for 16 seconds. Crew initiated manual engine shutdown. No 1 fire bottle also used. Air return to departing base followed. After landing, engine inlet outlet inspection satisfactory, compressor rotating freely. However, chip detectors were found to be full of metal debris with oil filter by-pass indicator activated. Filter removed to reveal a lot of fine metal particles as well. Engine replacement decided with investigations continuing.

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