SIKORSKY S92 A–ATA 3140 CENTRAL COMPUTERS (EICAS)–DCU–Miscompare. DR 611851954
DCU miscompare caution illuminated on departure. CHECK AGW advisory would not clear. DCU reset carried out by power, status indicated operational. DCU functional test carried out and tested serviceable IAW Ch 31-41-00 rev6.
SIKORSKY S92 A–ATA 2421 AC GENERATOR–ALTERNATOR–GENERATOR–FAILED. DR 611851996
Number 1 AC Generator failed resulting in #1 Autopilot, #1 MSP, Hydraulic and MGB indication loss. Moreover, three left-side PFD screens also blanked. Crew elected to divert to closest suitable safe landing site. Number 1 AC Generator GCU replaced, checks carried out, fault remained. AC power system tests carried out IAW 24-21-00-710-001. Number 1 AC generator confirmed unserviceable. Rectifications completed.
EUROCOPTER BO105 CBS–ATA 2560 EMERGENCY EQUIPMENT SYSTEM–Danbuoy–FAILED TO DEPLOY. DR 611852001
Upon dropping of a Dan buoy to four persons in the water during a SAR task, Dan buoy failed to deploy and sunk to the ocean floor. Investigations are continuing.
MDHC 500 D–ATA 6410 TAIL ROTOR BLADES–TAIL ROTOR BLADE–DELAMINATED. DR 611852006
Pilot noted tail rotor blade delamination at the tip area during his daily pre-flight inspection. Blade was replaced with a serviceable item and balance carried out.
EUROCOPTER EC175 B–ATA 5302 ROTORCRAFT TAIL BOOM –Dzus fastener–Undone. DR 611851974
During final walk around prior to departure, Dzus fastener on intermediate gearbox (IGB) fairing was found to be undone. During maintenance after a few flights, several Dzus fastener in the area were replaced with no further defects. OEM aware, had already advised previously that fastener in this area appear to be affected by vibration. SB available for replacing Dzus fasteners with wire locked screws. SB is planned to be carried out at upcoming maintenance when required specialist personnel will be onsite.
EUROCOPTER EC175 B–ATA 5302 ROTORCRAFT TAIL BOOM–TORCH–Left in aeroplane. DR 611851976
While carrying out scheduled inspections on HF antenna mounting brackets in the tail boom area, a torch (not an aircraft part) was found. This was not a company or onsite personal tool and appears to have been there since the aircraft was manufactured. Defect and incident reported to Engineering and OEM (TC holder) Airbus Helicopters. Internal Company safety alert will also be issued.