Gyrocopter pilot experiences low power after a short descent in humid conditions. With open pasture ...

Attributes
ACN	1255970
Time
Date	201504
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	Cruise
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Reciprocating Engine Assembly
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Sport / Recreational
Experience	Flight Crew Last 90 Days 5.5 Flight Crew Total 530 Flight Crew Type 530
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Departed with passenger on a scenic flight. About 40 minutes into flight; reduced throttle and descended from 900 ft. To 500 ft. When throttle added; subaru engine choked each time I attempted to add power above low cruise. I was over open pasture and conducted a safe precautionary landing. No damage or injuries. Upon return to airport; engine checked out and no systems found defective. Engine test run on ground to full throttle with no issues. Conditions were humid and icing is suspected.

Original NASA ASRS Text

Title: Gyrocopter pilot experiences low power after a short descent in humid conditions. With open pasture below a precautionary landing is accomplished. Intake icing is suspected.

Narrative: Departed with passenger on a scenic flight. About 40 minutes into flight; reduced throttle and descended from 900 ft. to 500 ft. When throttle added; Subaru engine choked each time I attempted to add power above low cruise. I was over open pasture and conducted a safe precautionary landing. No damage or injuries. Upon return to airport; engine checked out and no systems found defective. Engine test run on ground to full throttle with no issues. Conditions were humid and icing is suspected.

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.