A crj flight crew experienced apparent engine vibration just prior to descent for landing. They decl...

Attributes
ACN	984126
Time
Date	201112
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While enroute a moderate vibration developed and was felt in the airframe and the control yoke. Thrust and airspeed were reduced to 250 KTS and the vibration subsided. We advised approach of our condition and he vectored us for an approach to runway 02. We declared an emergency and landed safely without incident.contributing factors [and considerations for the emergency declaration] included: imminent engine shut down; possible flight control failure; IMC conditions; aircraft control; deviation to another airport facility for better emergency handling; heavy fatigue on this leg seven and extremely long day with multiple aircraft swaps and multiple deferments on equipment throughout the day on every leg.

Original NASA ASRS Text

Title: A CRJ flight crew experienced apparent engine vibration just prior to descent for landing. They declared an emergency and landed without incident.Factors contributing to the flight crew's ordeal included: fatigue; multiple legs; and multiple aircraft swaps each with deferred maintenance items.

Narrative: While enroute a moderate vibration developed and was felt in the airframe and the control yoke. Thrust and airspeed were reduced to 250 KTS and the vibration subsided. We advised Approach of our condition and he vectored us for an approach to Runway 02. We declared an emergency and landed safely without incident.Contributing factors [and considerations for the emergency declaration] included: Imminent engine shut down; possible flight control failure; IMC conditions; aircraft control; deviation to another airport facility for better emergency handling; heavy fatigue on this leg seven and extremely long day with multiple aircraft swaps and multiple deferments on equipment throughout the day on every leg.

Data retrieved from NASA's ASRS site as of April 2012 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.

A crj flight crew experienced apparent engine vibration just prior to descent for landing. They declared an emergency and landed without incident.factors contributing to the flight crew's ordeal included: fatigue; multiple legs; and multiple aircraft swaps each with deferred maintenance items.