A key component was never recovered, investigators seem to have misunderstood their own laboratory’s report on another and the NTSB conclusions omit to identify the evident failure of a shear pin to correctly perform its safety function as a factor.
An ATR72 suffered an uncommanded yaw and roll as it accelerated through 185 knots. The cause was traced to misassembly during a prior maintenance check. A cam in the rudder Travel Limitation Unit could be reversed, and pressures during the check triggered that misassembly.
At top of descent a 15 kg MLG door separated causing damage. Maintenance data “complex and contained error” and allowed “allowed nuts to be reused without checking their self-locking capability”.
The fourth accident to this H369D proved fatal. NTSB identify that undetected prior engine mount damage was the cause of a clutch failure while using an aerial saw at low level.
Prior Engine Mount Damage Lead to Fatal Aerial Saw Crash Read Post »
A series of systemic maintenance human factors issues emerge from a detailed AAIB investigation into cockpit/cabin fume event.
Flybe Fume Event (Part 1): Compressor Wash Maintenance Human Factors Case Study Read Post »
Terminal wire lugs T1, T2 & T3 were found unsecured. T1 was missing its securing nut, washer and lockwasher but was still contacting its terminal stud. T2 & T3 were found hand tight.
RCAF Investigate Defect on Newly Delivered CH-148 Cyclone (S-92) Read Post »
A rare engine failure mode related to miss-rigging a Shut Off Valve. The investigation triggered enhancing maintenance instructions.
Engine Shutdown Results in Revised SOV Rigging Instructions Read Post »
Hydraulics control system wiring had been misconnected 16 years earlier and repeatedly missed during checks. When inadvertently activated, the “HYD” cut-off caused the TR servo-valve compensator to make the aircraft uncontrollable say GPIAAF.
Fire-Fighting AS350 Hydraulics Accident: Dormant Miswiring Read Post »
The fitment of unapproved engine control parts was fundamental to an accident during training say the SA CAA.
Piper PA-30 Twin Comanche Accident After Unapproved Parts Failed Read Post »
The BEA look as production, maintenance fault-finding and flight operations lessons from a pair of incidents involving the AOA sensors on a Transavia Boeing 737-800.
AOA Anomalies on Successive B737-800 Flights Read Post »
A failed brazed stator assembly repair resulted in an uncontained turbine failure. The investigation identified apparent omissions in a DER produced repair scheme.
King Air 100 Uncontained TPE331-6 Failure – Inappropriate Repair Scheme Read Post »
An engine overdue for overhaul was refitted and 16 months later failed. The operator was not approved for passenger transport but the company was in financial distress so the pilot and part-owner accepted this charter.
The AAIB identify weaknesses in maintenance practices relating to flying control cables, an unrelated anomaly that has occurred on a number of Q400s and a weakness in how the Q400 FDR processes data that has been solved only for US operators.
Dash 8 Q400 Control Anomalies: 1 Worn Cable and 1 Mystery Read Post »
A confused response to an engine issue earlier in the day, a sudden power loss and a failed autorotation…but crashing into trees was decisive in the two occupants’ survival say NSIA.
Latent Engine Defect Downs R44: NR Dropped to Zero During Autorotation Read Post »
NTSB say that improper maintenance practices resulted in a lack of lubrication and excessive wear on an MLG uplock actuator.
Frozen Dash 8-100 Landing Gear After ‘Improper Maintenance Practices’ Say NTSB Read Post »
Degraded gust locks, an omission in familiarisation, a non-specific checklist and inadequate pre-flight checks all feature in this survey aircraft runway excursion.
Gust Lock Gaff: King Air A90 Runway Excursion Read Post »
Continuing airworthiness management: It’s not always better to do more maintenance than the TC Holder recommends. Part 1 of an article that will go on to look at occupant survivability in Part 2.
Hawaiian Air Tour EC130T2 Hard Landing after Power Loss (Part 1) Read Post »
The BFU investigated how flying controls of a SAR helicopter became disconnected. A nut was reused. Torque was insufficient. Lubrication was applied incorrectly. A cotter pin was likely omitted. The maintenance was also not signed off.
SAR AS365N3 Flying Control Disconnect: BFU Investigation Read Post »
Weaknesses in procedures, training and facilities at a P&W Non Destructive Inspection shop struggling with a backlog of novel Thermal Acoustic Imaging inspections of PW4000 fan blades.
NDI Process Failures Preceded B777 PW4077 Engine FBO Read Post »
This accident begs further questions about the FAA approach to ex-military helicopters and the adequacy of continued airworthiness activity of non-OEM TC Holders.
OH-58C Crash After MRB Fatigue Crack Read Post »
NTSB say an extra seal, left in a fuel control unit during overhaul 17 years earlier, resulted in an engine flameout in Nevada of a contracted aggressor aircraft.
17 Year Old FOD and a TA-4K Ejection Read Post »
An engine power loss due to contamination in the overhaul shop and wire locking left on a quick release mechanism conspired in this fire-fighting helicopter crash.
Maintenance Issues in Fire-Fighting S-61A Accident Read Post »
High concentrations of biocide in outer tanks resulted in residue jamming fuel controls at low fuel flows, so both engines momentarily dropped below idle of descent.
Japanese Jetstar Boeing 787 GEnx-1B Engine Biocide Serious Incident Read Post »
They say What You Look For is What You Find. Did investigators make that mistake?
Myanmar National Embraer 190 NLG Jam: Maintenance Error? We’re Not Convinced! Read Post »
A long delayed NTSB final report points to a series of maintenance standards and competency issues into this incident. Planned rulemaking to solve these was abandoned by FAA after 5 years.
CRJ-200 Landing Incident Highlighted US Maintenance Competency Inadequacies Read Post »
