Severe asymmetrical thrust and RPM caused flight crew to declare a emergency, shut down engine, retu...

Attributes
ACN	126606
Time
Date	198910
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dhn
State Reference	AL
Altitude	agl bound lower : 0 agl bound upper : 400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dhn artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : takeoff landing other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	126606
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Immediately after takeoff (approximately 400 AGL) we noticed propeller RPM had dropped from 1380 (normal) to 1150. This created a loud out-of-sync sound. At this time we discussed all possibilities available to us. In the interest of safety, we performed a precautionary shutdown, declared an emergency, and returned for landing without incident. All checklists (as appropriate) were performed (normal and abnormal). There were no injuries.

Original NASA ASRS Text

Title: SEVERE ASYMMETRICAL THRUST AND RPM CAUSED FLT CREW TO DECLARE A EMERGENCY, SHUT DOWN ENGINE, RETURNED AND LANDED.

Narrative: IMMEDIATELY AFTER TKOF (APPROX 400 AGL) WE NOTICED PROPELLER RPM HAD DROPPED FROM 1380 (NORMAL) TO 1150. THIS CREATED A LOUD OUT-OF-SYNC SOUND. AT THIS TIME WE DISCUSSED ALL POSSIBILITIES AVAILABLE TO US. IN THE INTEREST OF SAFETY, WE PERFORMED A PRECAUTIONARY SHUTDOWN, DECLARED AN EMER, AND RETURNED FOR LNDG WITHOUT INCIDENT. ALL CHECKLISTS (AS APPROPRIATE) WERE PERFORMED (NORMAL AND ABNORMAL). THERE WERE NO INJURIES.

Data retrieved from NASA's ASRS site as of August 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.

Severe asymmetrical thrust and RPM caused flight crew to declare a emergency, shut down engine, returned and landed.