<< >> NASA ASRS Report 241357, May 1993

Small aircraft on test flight for engine break in has throttle stick then become free but no effect on power. Emergency declared.

Attributes
ACN	241357
Time
Date	199305
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : fll
State Reference	FL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 30 flight time total : 33000 flight time type : 3000
ASRS Report	241357
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other Other
Supplementary
Primary Problem	Aircraft

Narrative:

Test flight after annual inspection and top engine overhaul. Departed fll runway 19L to conduct test and engine break-in flight. Asked by mia departure control to work at 2000 ft, 15-20 mi west of fll, remain north of runway 9L localizer. About 15 mins into flight, during throttle position change, throttle stuck, then became free, but no effect on engine control. Manifold pressure remained constant at 24 inches. Returned to fll, declared an emergency, shut down engine with mixture control overhead fll. Uneventful power off landing. Inspection revealed bolt connecting throttle cable to carburetor throttle arm was missing. I had personally checked bolt secure the previous day on final inspection.

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Original NASA ASRS Text

Title: SMA ON TEST FLT FOR ENG BREAK IN HAS THROTTLE STICK THEN BECOME FREE BUT NO EFFECT ON PWR. EMER DECLARED.

Narrative: TEST FLT AFTER ANNUAL INSPECTION AND TOP ENG OVERHAUL. DEPARTED FLL RWY 19L TO CONDUCT TEST AND ENG BREAK-IN FLT. ASKED BY MIA DEP CTL TO WORK AT 2000 FT, 15-20 MI W OF FLL, REMAIN N OF RWY 9L LOC. ABOUT 15 MINS INTO FLT, DURING THROTTLE POS CHANGE, THROTTLE STUCK, THEN BECAME FREE, BUT NO EFFECT ON ENG CTL. MANIFOLD PRESSURE REMAINED CONSTANT AT 24 INCHES. RETURNED TO FLL, DECLARED AN EMER, SHUT DOWN ENG WITH MIXTURE CTL OVERHEAD FLL. UNEVENTFUL PWR OFF LNDG. INSPECTION REVEALED BOLT CONNECTING THROTTLE CABLE TO CARB THROTTLE ARM WAS MISSING. I HAD PERSONALLY CHKED BOLT SECURE THE PREVIOUS DAY ON FINAL INSPECTION.

Data retrieved from NASA's ASRS site as of July 2007 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.