19 September—4 December 2017

618

GENERAL ELECTRIC GENX1B54 P2—ATA 7800 ENGINE EXHAUST SYSTEM—Bump Pad—SHEARED. DR 611750871
During compressor wash, RH engine thrust reverser bump pad large washer fell out of engine. Thrust reverser RH OB bump pad found sheared, whereas LH bump pad found partially sheared. Inspections found retaining screws for thrust reverser bump pad had sheared with remaining parts located at the top of the engine on unison ring. Both screws extracted and new screws installed per AMM. Visual inspection of upper area of engine carried out for damage, condition and security.

PRATT AND WHITNEY PW118—ATA 7230 TURBINE ENGINE COMPRESSOR SECTION—COMPRESSOR—FOD. DR 611750917
FOD reported on #2 engine air inlet near compressor. Relevant inspections completed, no damage found.

GENERAL ELECTRIC CF34 8E5—ATA 7250 TURBINE ENGINE TURBINE SECTION—TURBINE—HIGH EGT. DR 611750922
A/C returned due #2 engine high ITT (967°C for 14 sec).  Eng #2 water wash carried out, ITT margin recovered.

PRATT AND WHITNEY PT6A 60A—ATA 7321 FUEL CONTROL/TURBINE ENGINES—Connecting Rod—WORN. DR 611750942
Wear in FCU rod ends, allowing balls to dislocate when removed from FCU attaching arm. Starter generator was replaced. Strip report is awaited.

PRATT AND WHITNEY PT6A 42—ATA 7261 TURBINE ENGINE OIL SYSTEM—CARBON SEAL—LEAKING. DR 611750955
During climb, right-hand engine oil pressure was a steady 121 PSI. Just prior to TOD, pressure started to drop and at TOD it was at 99 (in the yellow range) reducing to 84 PSI on short finals. Troubleshooting found oil leak from starter generator carbon seal. Carbon seal replaced and aircraft returned to service.

PRATT AND WHITNEY PW123—ATA 7260 TURBINE ENGINE ACCESSORY DRIVE—SEAL—LEAKING. DR 611751003
During flight, crew observed oil pressure fluctuations/warning light momentarily illuminating. Crew elected to carry out a precautionary #2 engine shut down. During rectifications, #2 engine starter generator shaft seal found defective, same replaced. Leak check carried out, nil leaks and aircraft returned to service.

GENERAL ELECTRIC CF6 80E1 A2—ATA 7230 TURBINE ENGINE COMPRESSOR SECTION—Lever Arm—Liberated. DR 611751006
Tech crew reported, ‘Eng vibration advisory’—#2 engine high N2 observed @ FL370 with 7.2 units of vibes. N1 reduction to 80% reduced vibration levels to below 5.6 units. EGT on #2 engine was 15 degree C greater comparing to #1 Eng. Moreover Eng #2 oil pressure fluctuations observed. On arrival, engineers observed metal in #2 engine tailpipe. MCD inspected with debris on all. On opening of thrust reverser cowls, 5th stage VSV lever arm was found liberated from unison ring. Engine change declared. Investigation is in progress.

GENERAL ELECTRIC CF6 80E1 A4—ATA 7250 TURBINE ENGINE TURBINE SECTION—TURBINE ENGINE—Hi Vibes. DR 611751096
In cruise, ECAM vibration advisory indicated #1 engine N2 high vibes. Relevant FCOM procedure followed, power reduced. Vibration level dropped but continued to fluctuate. PAN was declared and descent made to FL250 to allow flight on one engine should it be necessary to shut the engine down. On landing, an unusual sound was heard after touch down. N2 vibration was elevated and peaked at 7.8 units. At gate, metal debris was found in the tailpipe. Engine change called out. Investigation is in progress.

GENERAL ELECTRIC CT7 8A—ATA 7320 FUEL CONTROLLING SYSTEM—T1 sensor—Out of Range. DR 611751108
While hovering at 35’ above vessel, #1 FADEC FAULT and #2 FADEC FAULT illuminated simultaneously. Rotorcraft returned to base. Approx. 5 minutes later, both caution lights went out. Company has experienced this defect weeks ago. Fault finding indicated that T1 sensors can trigger FADEC fault. T1 sensors removed and cleaned. Probable cause identified by Sikorsky is one of T1 sensors going ‘out of range’. Trigger of this event is attributed to engine bay temperature increasing during hover. Sikorsky has recommended replacing particular sensor which is giving furthest out of range reading (testing done after removal).

ALLISON 250 C20—ATA 7250 TURBINE ENGINE TURBINE SECTION—BEARING—FAULTY MANUFACT. DR 611751112
Recall notification advice received from approved MRO via email listing three different P/N’s and several S/N’s that are affected. Understood to be a spool bearing problem. Remove suspect units and have them repaired.

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