<< >> NASA ASRS Report 1118792, September 2013

CE750 flight crew reports a loud bang and vibration descending through 15;000 ft. No cas messages are present and the vibration is greatly reduced when speed is reduced. Flight continues to a normal landing where ground control reports that a large portion of the right engine cowl is missing.

Attributes
ACN	1118792
Time
Date	201309
Local Time Of Day	0601-1200
Place
Locale Reference	NCT.TRACON
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct STAR HYP5
Flight Plan	IFR
Component
Aircraft Component	Cowling
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Flight Engineer Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 85 Flight Crew Total 10700 Flight Crew Type 180
Person 2
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 3500 Flight Crew Type 50
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

After four hours of flight we were descending thru 15;000 ft MSL and being vectored on the arrival. We heard a sudden bang and felt a vibration. We slowed the aircraft to 200 KIAS and checked aircraft systems. The vibration settled down and all aircraft and engine systems were normal. We disconnected the autopilot and aircraft flight was normal. We continued a normal visual approach and landing. On taxi to the ramp ground control reported to us that it appeared the engine cowling on the number 2 engine was missing.

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Original NASA ASRS Text

Title: CE750 flight crew reports a loud bang and vibration descending through 15;000 FT. No CAS messages are present and the vibration is greatly reduced when speed is reduced. Flight continues to a normal landing where Ground Control reports that a large portion of the right engine cowl is missing.

Narrative: After four hours of flight we were descending thru 15;000 FT MSL and being vectored on the arrival. We heard a sudden bang and felt a vibration. We slowed the aircraft to 200 KIAS and checked aircraft systems. The vibration settled down and all aircraft and engine systems were normal. We disconnected the autopilot and aircraft flight was normal. We continued a normal visual approach and landing. On taxi to the ramp Ground Control reported to us that it appeared the engine cowling on the Number 2 engine was missing.

Data retrieved from NASA's ASRS site as of July 2013 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.