<< >> NASA ASRS Report 1119637, September 2013

A single pilot reports he had to turn off his engine in a C-170 aircraft on a very short final because the throttle would not close completely resulting in too much power.

Attributes
ACN	1119637
Time
Date	201309
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna 170
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Direct
Flight Plan	None
Component
Aircraft Component	Carburetor
Person 1
Function	Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 1700 Flight Crew Type 1400
Events
Anomaly	Aircraft Equipment Problem Critical Inflight Event / Encounter Fuel Issue

Narrative:

On approach to landing; I discovered the throttle would not completely close resulting in too much power for a normal approach/landing. On very short final I turned off the engine and landed the airplane. When on the ground I notified the tower that I had turned off the engine on short final and would be coasting off runway at taxiway-F. I announced to the tower that I had cleared runway-32 and would attempt a restart to taxi to the FBO. On restart; the engine speed remained high as the throttle would not close completely. The tower instructed me to taxi to the ramp via taxiways 'a' and 'east'; which I did without issue. Mechanical work [was] performed by an FBO over the next two days and resulted in the discovery of a detached accelerator pump discharge tube in the carburetor and subsequent replacement with a factory overhauled carburetor. At no time was there an emergency situation; or a declaration of an emergency situation by the pilot.

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Original NASA ASRS Text

Title: A single pilot reports he had to turn off his engine in a C-170 aircraft on a very short final because the throttle would not close completely resulting in too much power.

Narrative: On approach to landing; I discovered the throttle would not completely close resulting in too much power for a normal approach/landing. On very short final I turned off the engine and landed the airplane. When on the ground I notified the Tower that I had turned off the engine on short final and would be coasting off runway at Taxiway-F. I announced to the Tower that I had cleared Runway-32 and would attempt a restart to taxi to the FBO. On restart; the engine speed remained high as the throttle would not close completely. The Tower instructed me to taxi to the Ramp via Taxiways 'A' and 'E'; which I did without issue. Mechanical work [was] performed by an FBO over the next two days and resulted in the discovery of a detached Accelerator Pump Discharge tube in the carburetor and subsequent replacement with a factory overhauled carburetor. At no time was there an emergency situation; or a declaration of an emergency situation by the pilot.

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.