Date: 201706
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Light: Daylight
Aircraft: Challenger 300
Operator: Fractional
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Parked
ATC / advisory: Ramp ZZZ
Reporter organization: Fractional
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Situational Awareness
Second reporter function: First Officer; Pilot Flying
Anomaly: Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Other Person
Result: General None Reported / Taken
Contributing factors: Chart Or Publication; Procedure; Human Factors
Primary problem: Human Factors

Narrative: I was notified that I apparently flew our aircraft four legs with jack pads installed from a previous maintenance event.  The aircraft in question had been in that station for approximately 3 weeks and was located in the hangar when we arrived that morning.  After requesting the aircraft be towed out of the hangar; I proceeded to accomplish a review and conduct a day one aircraft inventory.  Gear pins were left in and the aircraft was towed out of the hangar and placed on line in front of the FBO.  A review of the aircraft log showed numerous write-ups and sign-offs for a myriad of discrepancies; none of which left the impression that the airplane had been jacked up off the ground using the jack-pads.  A pre-flight walk around was conducted by the First Officer as well as the removal of the gear pins.  A pre-departure walk around was completed by me prior to departing.  A post flight walk-around; another pre-departure and again another post-flight walk-around was again completed upon arrival at our destination where I was relieved by a Captain.  The jack-pads were not seen/identified during any of these procedures by any of the crew members that day.  I am unaware of when and how the jack-pads were detected.  Inadequate Pre; Post Flight walkaround inspections by crew members.  I am disappointed and upset at myself for not seeing the jack-pads during my time operating the aircraft.  All crew members should complete a more thorough Pre; Post Flight Walkaround.  Paying more attention to the less obvious areas of the underside of the aircraft.  A maintenance log entry indicating the installation of the jack-pads and subsequent sign-off would help prevent this situation from occurring again in the future.


Second narrative: Notified that Aircraft X was found with 3 jack pads installed from previous maintenance performed unknown to me after the fact. Four legs were flown. Captain said he was checking aircraft in hangar and completed inventory check. Next morning departed after preflight and did not notice jack pads attached nor was I even aware of where jack pads would be attached. Emphasis was on wheels and brakes and general airframe condition.Suggestions - Have both crew aware of what type maintenance is accomplished and quality control of maintenance facilities performing work. Show where jack pads would be attached at and how it can easily be overlooked after even cursory walkaround inspections during multiple legs.


Synopsis: Challenger 300 flight crew reported flying four legs with jack pads still attached from previous maintenance.