On climb out from isp C172 pilot experiences RPM loss and rough running of engine. Requests priority handling for an immediate landing back at isp.

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Attributes
ACN	625658
Time
Date	200407
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp.airport
State Reference	NY
Altitude	msl bound lower : 800 msl bound upper : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp.tower
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : initial
Route In Use	departure : vfr
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 16 flight time total : 223 flight time type : 204
ASRS Report	625658
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : declared emergency flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While plting a C172 at isp, runway 6, I was cleared to take off. At 800 ft I was cleared to a heading of 110 degrees when the aircraft experienced engine vibration and loss of RPM. Published poh emergency procedures did not alleviate the problem. I then requested ATC priority for an emergency landing on runway 28. Cause of problem was determined to be an intake leak with #4 cylinder due to a loose coupling.

Original NASA ASRS Text

Title: ON CLBOUT FROM ISP C172 PLT EXPERIENCES RPM LOSS AND ROUGH RUNNING OF ENG. REQUESTS PRIORITY HANDLING FOR AN IMMEDIATE LNDG BACK AT ISP.

Narrative: WHILE PLTING A C172 AT ISP, RWY 6, I WAS CLRED TO TAKE OFF. AT 800 FT I WAS CLRED TO A HDG OF 110 DEGS WHEN THE ACFT EXPERIENCED ENG VIBRATION AND LOSS OF RPM. PUBLISHED POH EMER PROCS DID NOT ALLEVIATE THE PROB. I THEN REQUESTED ATC PRIORITY FOR AN EMER LNDG ON RWY 28. CAUSE OF PROB WAS DETERMINED TO BE AN INTAKE LEAK WITH #4 CYLINDER DUE TO A LOOSE COUPLING.

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.