Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; General Maintenance Action
Aircraft; Human Factors; Procedure
I operated Aircraft X. When I had shown up to the aircraft the FO (First Officer) was already at the aircraft. The FO had the aircraft powered up and had started the preflight duties. During the before start checklist it was acknowledged that the preflight was completed. The FO did not indicate that anything appeared abnormal during the preflight. Before the pushback the ground personnel said all secure below; FOD walk complete; steering disengaged; standing by for parking brake. The ground personnel did not report any panels that were open. Some point above sterile we heard a thump noise. We then called the flight attendant to ask if everyone was okay. The flight attendant indicated everything was fine. We checked the EICAS and all the engine instruments were in the green. We then checked the MFD pages and everything was normal. We preceded onto the destination as there was nothing to indicate any abnormality. We have no way of knowing if this was related to the latches underneath the engine coming open. When we had arrived to the gate the ground personnel had told us that there was two latches underneath the engine hanging down. The two doors open underneath Engine Number 1 was the engine oil service door and the air turbine starter access panel. Me and the FO proceeded outside during the walk around to look at the access panels underneath the engine and relayed the information to Maintenance. The access panels had also caused holes in the engine cowling.The cause was the access panels underneath Engine Number 1 came open during the flight. During the preflight during before departure nothing was noticed abnormal.A thorough preflight was done before the flight. Nothing out of the abnormal was indicated by the FO or the ground crew. A thorough preflight was accomplished and should before every flight. No other suggestions at this time.
Air carrier Captain reported that the access panels underneath one of the engines came open during the flight. Postflight inspection revealed that the open panels had made holes in the engine cowling.