Date: 201411
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: DA40 Diamond Star
Operator: Personal
Operating under: Part 91
Flight plan: VFR
Mission: Training
Flight phase: Landing
Airspace: Class E ZZZ
ATC / advisory: CTAF ZZZ
Second aircraft: Any Unknown or Unlisted Aircraft Manufacturer
Reporter organization: Personal
Reporter function: Trainee; Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Student
Human factors: Communication Breakdown; Situational Awareness
Second reporter function: Instructor
Anomaly: Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Took Evasive Action; General Flight Cancelled / Delayed
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: I was taxiing my aircraft to the departure end of the runway.  During that time a biwing aircraft departed [the same] runway.  [The pilot] did not announce on the CTAF his position or intentions.  At the same time I heard [another aircraft] announce his entry on the downwind over the CTAF frequency.  I announced my departure and taxied onto the runway.  I heard [the other aircraft] radio to the biplane and requested departing traffic to announce his intentions.  I glanced up toward the downwind pattern and witnessed the biplane making a climbing left turn and entering the downwind directly in front of [the other aircraft].  The biplane did not answer the request for intentions nor did he maneuver in a way that would appear he heard the request.  I proceeded with my takeoff and climbed into the pattern.  During my climb I continued to hear [the other aircraft] asking the biplane his intentions and then announced that the biplane was performing aerobatic maneuvers in the pattern near the approach end of the runway and that he had cut in front of him in the pattern.  As I continued in the pattern through crosswind and onto downwind; I observed the biplane making circular maneuvers in the approach end of the runway.  He made two tight descending turns in opposite directions and then made a high bank and seemingly fast approach to the runway.  Noticing his erratic maneuvers and that there was an aircraft holding short of the runway waiting for departure; I announced over the CTAF [the biplane's] position and that he appeared to be on approach to final. The aircraft holding short acknowledged seeing the aircraft and his unsafe behavior.  I watched the biplane land and continued my approach through base and final.  After landing I heard [the other aircraft] announce the biplane was continuing to make unsafe maneuvers and disregarding the traffic pattern.  Apparently; the biplane had departed again while I was maneuvering to land.  I taxied back and departed again to remain in the pattern.  I did not have a visual on [the biplane] throughout the pattern.  I heard [the other aircraft] announce his position behind me following me throughout the pattern.  As I was on short final; I saw [the biplane] crossing above me from east to west even with the approach end of the runway and seemingly less than pattern altitude.  [The other aircraft] announced his position and that the biwing aircraft was continuing to maneuver in front of him in the pattern.  After landing; I decided to taxi to the hangars and discontinue my flight due to the inherent safety risks the pilot of [the biplane] was creating for all other aircraft in the immediate vicinity.  I would like to note; there was one other aircraft in the pattern during these events; however I do not recall his call sign.  That aircraft also announced his positions and announced his witness to the unsafe maneuvers and actions of [the biplane].  Both myself and [the other aircraft] discontinued our flights due to the unsafe actions we had witnessed.  Although radio communication is not required in class E airspace; all traffic must obey the established traffic patterns and right of way regulations for the safety of all pilots and aircraft.  What I witnessed today was a complete disregard for Federal Aviation Regulations and a disregard of the safety of all those at and around ZZZ.


Second narrative: While conducting closed traffic at ZZZ on a training flight; a biplane took off from runway XX without making any radio calls. The biplane then flew right overhead of the airport and started doing circles at traffic pattern and below; cutting multiple aircraft off in the pattern. The pilot showed absolutely no regard for anyone's safety. Could have easily resulted in a mid-air collision.


Synopsis: Three pilots report extremely dangerous behavior by the pilot of a biplane operating in the traffic pattern of a non-towered airport.