During downwind approach pilot experiences a rough running engine and advises the tower of the issue...

Narrative:

I departed with 40 gallons of fuel. One hour and thirty minutes in flight I was cleared to land on runway xxl at [my destination]. On downwind engine started missing. I notified tower of engine missing; would prefer runway xr. Tower asked if it was an emergency and how much fuel and how many people were onboard. I replied; 'no; it sounds like a magneto; 9 gallons; and three people on board. Tower replied; 'cleared to land runway xr.' on short final engine died and I landed and stopped on runway xr.intermittent power loss is undetermined at this point. Mechanic will checkout the engine to determine the cause.

Original NASA ASRS Text

Title: During downwind approach pilot experiences a rough running engine and advises the Tower of the issue and the need to land opposite direction on the active runway; which is approved. Engine quits on short final and a safe landing ensues.

Narrative: I departed with 40 gallons of fuel. One hour and thirty minutes in flight I was cleared to land on Runway XXL at [my destination]. On downwind engine started missing. I notified Tower of engine missing; would prefer Runway XR. Tower asked if it was an emergency and how much fuel and how many people were onboard. I replied; 'No; it sounds like a magneto; 9 gallons; and three people on board. Tower replied; 'Cleared to land Runway XR.' On short final engine died and I landed and stopped on Runway XR.Intermittent power loss is undetermined at this point. Mechanic will checkout the engine to determine the cause.

Data retrieved from NASA's ASRS site as of July 2013 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	1098644
Time
Date	201306
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	Landing
Component
Aircraft Component	Reciprocating Engine Assembly
Person 1
Function	Pilot Flying Single Pilot
Events
Anomaly	Aircraft Equipment Problem Critical

During downwind approach pilot experiences a rough running engine and advises the tower of the issue and the need to land opposite direction on the active runway; which is approved. Engine quits on short final and a safe landing ensues.