A passenger in a titanium gyrocopter reported hearing an engine misfire during flight. The pilot req...

Narrative:

Late morning local time; myself and the gyrocopter pilot were conducting a demonstration flight in a new gyrocopter recently arrived at the field and intended on staying in the pattern. The pilot in command held a private pilot rating in asel with sport pilot privileges for rotorcraft gyroplane and light sport CFI for gyroplane. I was a non-rated gyroplane passenger holding certificates in commercial asel and msel; instrument airplane; and CFI for single engine land. There were at least one other aircraft (a piper cherokee) in the pattern which was turning for or on downwind for our takeoff.we were cleared for takeoff and on climb out at approximately 300 ft; the engine made a vibration similar to a miss in firing sequence. I questioned the pilot as to the event in which the reply was not sure. At about 500 ft; the miss in firing sequence occurred again in which I felt we were beginning to experience an engine failure and communicated my concern to the pilot in command who immediately [advised ATC] and requested an immediate landing. At the time; the engine had less than 50 hours since new. The discussion between the pilot and myself was to continue downwind hoping to at least pass mid field where we could auto rotate into the wind onto runway xx should the engine fail completely. After [advising ATC]; the tower instructed the cherokee to continue their approach for runway xx (being we were supposed to be #2) and for us to also continue for runway xx. Nearly immediately; the pilot of the cherokee questioned the tower asking if the 'should sidestep for the aircraft who [is having problems]' or words to that affect; which the tower then cleared them for the sidestep.having worked in the ATC environment for nearly 8 years and flying for over 10 years; I expected the tower to issue us a 'cleared to land any runway' clearance and keep the other traffic orbiting. At one time during our approach; the cherokee was below us and occupying the runway where we would have had to auto rotate toward if the engine had actually failed. I believe this clearance was issued in poor judgment and created a potential traffic conflict.no problem was found with the engine and it did not exhibit the symptom again. Succeeding demonstration flights were uneventful.

Original NASA ASRS Text

Title: A passenger in a Titanium Gyrocopter reported hearing an engine misfire during flight. The pilot requested to return to land and ATC sequenced them behind other landing traffic even with a potential engine failure.

Narrative: Late morning local time; myself and the Gyrocopter pilot were conducting a demonstration flight in a new gyrocopter recently arrived at the field and intended on staying in the pattern. The pilot in command held a private pilot rating in ASEL with Sport Pilot privileges for rotorcraft gyroplane and Light Sport CFI for Gyroplane. I was a non-rated gyroplane passenger holding certificates in Commercial ASEL and MSEL; instrument airplane; and CFI for single engine land. There were at least one other aircraft (a Piper Cherokee) in the pattern which was turning for or on downwind for our takeoff.We were cleared for takeoff and on climb out at approximately 300 ft; the engine made a vibration similar to a miss in firing sequence. I questioned the pilot as to the event in which the reply was not sure. At about 500 ft; the miss in firing sequence occurred again in which I felt we were beginning to experience an engine failure and communicated my concern to the pilot in command who immediately [advised ATC] and requested an immediate landing. At the time; the engine had less than 50 hours since new. The discussion between the pilot and myself was to continue downwind hoping to at least pass mid field where we could auto rotate into the wind onto RWY XX should the engine fail completely. After [advising ATC]; the tower instructed the Cherokee to continue their approach for RWY XX (being we were supposed to be #2) and for us to also continue for RWY XX. Nearly immediately; the pilot of the Cherokee questioned the tower asking if the 'should sidestep for the aircraft who [is having problems]' or words to that affect; which the tower then cleared them for the sidestep.Having worked in the ATC environment for nearly 8 years and flying for over 10 years; I expected the tower to issue us a 'cleared to land any runway' clearance and keep the other traffic orbiting. At one time during our approach; the Cherokee was below us and occupying the runway where we would have had to auto rotate toward if the engine had actually failed. I believe this clearance was issued in poor judgment and created a potential traffic conflict.No problem was found with the engine and it did not exhibit the symptom again. Succeeding demonstration flights were uneventful.

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.

Attributes
ACN	1466484
Time
Date	201707
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Amateur/Home Built/Experimental
Operating Under FAR Part	Part 91
Flight Phase	Takeoff
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Engine
Person 1
Function	Pilot Not Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 525 Flight Crew Type 0
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe

A passenger in a titanium gyrocopter reported hearing an engine misfire during flight. The pilot requested to return to land and ATC sequenced them behind other landing traffic even with a potential engine failure.