15th October to 13th November 2018

276

CFM CFM56 7B 18–ATA 7830 THRUST REVERSER–THRUST REVERSER–FAILED TO DEPLOY. DR 611852680
Thrust reverser failed to deploy after landing, reverser light illuminated. Fault cleared after reset, operational tests satisfactory. Defect not confirmed. System Health Monitoring prompted further troubleshooting. ATA 78 are monitored by approved Reliability program. Boeing SL 737-SL-78-080 refers.

IAE V2500–ATA 7321 FUEL CONTROL/TURBINE ENGINES–FMU–Fuel leak. DR 611852686
Number 2 Engine fuel leak from electrical connector (4000KC-B). Fuel metering unit replaced.

GENERAL ELECTRIC CT7 8A–ATA 7321 FUEL CONTROL/TURBINE ENGINES–EEC–UNSERVICEABLE. DR 611852705
During Flight, ECAS Display FADEC 1, FADEC 2, ENG 2 OVSP TEST faults reported at landing. FADEC 1 A/F XENG ARINC DATA FAULT CH A CODE 25 FADEC NO DISPATCH FAULT CODE 20 EECU 2 CHANNEL A CRITICAL INTERNAL FAULT CODE 009 FADEC 2 OVERSPEED TEST FAULT CH A CODE 16 Root cause: #2 Engine Control Internal Fault/Failure. Rectifications: EEC #1 & #2 swapped, tested serviceable. Fault reappeared and transposed to #2 side, confirming EEC had internal failure. EEC replaced with serviceable item. Aircraft has flown more than five hours since replacement of EEC with nil further fault.

LYCOMING ALF502R 5–ATA 7497 IGNITION WIRING–CIRCUIT BREAKER–TRIPPED. DR 611852735
During engine start, with no 2 ignition A and B selected, start + control ignition B circuit breaker KN7 tripped. 
Root cause: Wire KN 207 found chaffed from LH wing bulkhead connector 20ANA pin B to #2 Eng start contactor KN26. Splice repair carried out. Follow up checks satisfactory.

LYCOMING LF507 1F–ATA 7321 FUEL CONTROL/TURBINE ENGINES–HMU–Off schedule. DR 611852736
After advancing thrust levers during take-off run, AMBER caution ‘FADEC FAULT’ illuminated and take-off was aborted at 20 knots. E.C.U. inspected for fault codes–codes #6 & #7 showing. ECU replaced, however during subsequent engine runs, it became evident that H.M.U. was at fault (due engine not accelerating above 74% N1). Final fix: Hydro Mechanical Unit HMU, replaced. Follow up tests satisfactory.

CFM CFM56 7B 18–ATA 7830 THRUST REVERSER–THRUST REVERSER–FAILED TO DEPLOY. DR 611852756
On arrival, ENG # 1 RVSR did not deploy on landing, amber RVSR light on O/head panel illuminated. EAU BITE showed multiple faults i.e. $834–DIR control valve sensor with L & R Sleeve Stow Sensor $831 / $832 and L & R sleeve lock sensor $835 / $836. EAU Faults cleared IAW FIM task 78-31-task 801. Reverser cycled 5 times without repeat faults. B737 Thrust reverser issues are a known reliability concern with ATA 78 issues monitored through approved Reliability program. Boeing SL 737-SL-78-080 refers.

ROLLS ROYCE 250 C300/A1–ATA 7321 FUEL CONTROL/TURBINE ENGINES–FCU–Off schedule. DR 611852779
First start cold, normal, idle low at 58% N1(should have be between 63–67%) with no input increased to 72%, then slowly up to 76% fluctuating. FCU removed, excessive movement on FCU driveshaft noticed. Suspect collapse of bearing assembly. Governor/FCU removed, spline drives serviceable. Repair/replacement of Fuel Control Unit required. Necessary rectifications are continuing.

LYCOMING LF507 1F–ATA 7250 TURBINE ENGINE TURBINE SECTION–TURBINE ENGINE–FIRE. DR 611852783
Shortly after passing through transition, fire warnings on #4 engine illuminated/heard. Relevant checklists completed. Initial ground inspections found signs of fire activity present with heat buckling & distortion + burn evidence around the lower 1/3rd of the Engine Cowls i.e. 4 o’clock to 8 o’clock relative positions. Also signs of wetting from a large oil leak around #2 Bearing, scavenge feed pipe areas, lower HPT casing. Engine is being removed for MRO strip & further investigation.

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