<< >> NASA ASRS Report 307205, June 1995

Return land mandated by aircraft equipment problem malfunction in a commuter light transport. Overweight landing performed.

Attributes
ACN	307205
Time
Date	199506
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mke
State Reference	WI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 176 flight time total : 2500 flight time type : 75
ASRS Report	307205
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During takeoff roll and on climb out a vibration was detected by myself and the captain. The captain tapped the foot brakes to stop a suspected rolling of the tires in the wheel wells. This did not stop the vibration. I selected a different propeller RPM setting to stop the vibration. Again to no avail. At approximately 7000 ft MSL a loud pop was heard from the left engine as well as a yaw towards that side and propeller RPM deviations of from 1450-1600 rpms before stabilizing at 1550 RPM. Both the captain and I decided to return to mke where after the ILS to runway 1L we landed approximately 200 pounds overweight. I believe the only way this could have been avoided would have been to fly around long enough to burn off 200 pounds of fuel. But in the situation we didn't know how serious the problem with the propeller was so we thought the best thing to do was to get the plane on the ground.

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Original NASA ASRS Text

Title: RETURN LAND MANDATED BY ACFT EQUIP PROB MALFUNCTION IN A COMMUTER LTT. OVERWT LNDG PERFORMED.

Narrative: DURING TKOF ROLL AND ON CLBOUT A VIBRATION WAS DETECTED BY MYSELF AND THE CAPT. THE CAPT TAPPED THE FOOT BRAKES TO STOP A SUSPECTED ROLLING OF THE TIRES IN THE WHEEL WELLS. THIS DID NOT STOP THE VIBRATION. I SELECTED A DIFFERENT PROP RPM SETTING TO STOP THE VIBRATION. AGAIN TO NO AVAIL. AT APPROX 7000 FT MSL A LOUD POP WAS HEARD FROM THE L ENG AS WELL AS A YAW TOWARDS THAT SIDE AND PROP RPM DEVS OF FROM 1450-1600 RPMS BEFORE STABILIZING AT 1550 RPM. BOTH THE CAPT AND I DECIDED TO RETURN TO MKE WHERE AFTER THE ILS TO RWY 1L WE LANDED APPROX 200 LBS OVERWT. I BELIEVE THE ONLY WAY THIS COULD HAVE BEEN AVOIDED WOULD HAVE BEEN TO FLY AROUND LONG ENOUGH TO BURN OFF 200 LBS OF FUEL. BUT IN THE SIT WE DIDN'T KNOW HOW SERIOUS THE PROB WITH THE PROP WAS SO WE THOUGHT THE BEST THING TO DO WAS TO GET THE PLANE ON THE GND.

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.