Narrative:

I usually come into work early before everybody else because I like peace and quiet to thoroughly preflight; clean the helicopters; and tidy/organize the overall setting to begin receiving customers. On [this day]; we happened to have our regular mechanic work on another helicopter. He had already started working when I arrived. Upon preflight of helicopter; I noticed the date written on the oil-filter. It seemed to me lately in the few times I saw the date previously that the date seemed pretty far back in time compared to the use of this helicopter. Due to the mechanic working on another helicopter; the logbooks of the helicopters were in our hangar so I took the opportunity to review the logs. That is when I found that the last entry was an annual inspection performed on the day that corresponded with the date written on the oil-filter. I immediately informed our chief-pilot of my findings; who then reported them to our boss. To my knowledge; the aircraft has been since grounded and is scheduled for maintenance.[this helicopter] has been operated by multiple pilots; including myself and the owner/boss since the missed 100 hr inspection.except for the boss/owner; no one had free access to any of those logbooks. We relied on the word of mouth of the boss/owner and the chief-pilot. Attempts from myself to get to know those numbers remained unanswered by the boss/owner up until [that day]. It is my understanding as pilot that in this particular case I failed my responsibilities as pilot in command to verify the airworthiness of [this] helicopter. In the future; I will make sure the airworthiness on any known aircraft I intend to operate is up to date as well as reviewing the logbooks of any to me new aircraft before I operate it; even if such request would result in a termination of employment.when I started work as pilot [for this company]; I tried to implement a white board visible to all pilots at any time stating any important hours of any aircraft of our fleet i.e. Maintenance hours; annual and avionics due dates; as well as the pilots medical dates and bfrs etc. This white board is now hung up; visible to all personnel and will hopefully help ensure that this occurrence remains unique and in the past. Also; since my discovery of this failed 100 hr inspection; the boss/owner has been cooperative with logbooks and was also helpful completing empty slots on this white board.

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Original NASA ASRS Text

Title: Helicopter pilot reported discovering a missed maintenance inspection during preflight review.

Narrative: I usually come into work early before everybody else because I like peace and quiet to thoroughly preflight; clean the helicopters; and tidy/organize the overall setting to begin receiving customers. On [this day]; we happened to have our regular mechanic work on another helicopter. He had already started working when I arrived. Upon preflight of helicopter; I noticed the date written on the oil-filter. It seemed to me lately in the few times I saw the date previously that the date seemed pretty far back in time compared to the use of this helicopter. Due to the mechanic working on another helicopter; the logbooks of the helicopters were in our hangar so I took the opportunity to review the logs. That is when I found that the last entry was an annual inspection performed on the day that corresponded with the date written on the oil-filter. I immediately informed our chief-pilot of my findings; who then reported them to our boss. To my knowledge; the aircraft has been since grounded and is scheduled for maintenance.[This helicopter] has been operated by multiple pilots; including myself and the owner/boss since the missed 100 hr inspection.Except for the boss/owner; no one had free access to any of those logbooks. We relied on the word of mouth of the boss/owner and the chief-pilot. Attempts from myself to get to know those numbers remained unanswered by the boss/owner up until [that day]. It is my understanding as pilot that in this particular case I failed my responsibilities as pilot in command to verify the airworthiness of [this] helicopter. In the future; I will make sure the airworthiness on any known aircraft I intend to operate is up to date as well as reviewing the logbooks of any to me new aircraft before I operate it; even if such request would result in a termination of employment.When I started work as pilot [for this company]; I tried to implement a white board visible to all pilots at any time stating any important hours of any aircraft of our fleet i.e. maintenance hours; annual and avionics due dates; as well as the pilots medical dates and BFRs etc. This white board is now hung up; visible to all personnel and will hopefully help ensure that this occurrence remains unique and in the past. Also; since my discovery of this failed 100 hr inspection; the boss/owner has been cooperative with logbooks and was also helpful completing empty slots on this white board.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.