C550B citation during climb hears a loud bang and then a series of consecutive bangs. Right hand eng...

Attributes
ACN	396758
Time
Date	199803
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zzz.artcc
State Reference	TX
Altitude	msl bound lower : 25000 msl bound upper : 26000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz1.artcc
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 3062 flight time type : 350
ASRS Report	396758
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I departed shv at approximately XX00 CST on an IFR flight plan to sat. All engine instruments were normal during the taxi, takeoff, and climb. During the climb phase of flight at approximately 25500 ft, a loud bang was heard followed by a series of consecutive bangs. I immediately scanned the engine instruments and annunciator panel and the only annunciator light illuminated was the right hand engine vibration light. I then heard a loud continuous roar. I retarded the right hand throttle, but the loud roar continued. A second look at the engine instruments the N1 for the left hand engine was erratic. I advanced the right hand throttle and retarded the left hand throttle and the roaring noise became quieter. The right hand engine vibration annunciator light remained illuminated. I declared an emergency and requested priority handling with a return to shv. After the left hand throttle was in the idle position for approximately 2-3 mins it stopped producing thrust/quit running. I then placed the left hand throttle in the cut-off position. There was no attempt to restart the engine. The right hand engine vibration light extinguished and single engine landing procedures were accomplished. The total length of the flight was approximately 31 mins. Callback conversation with reporter revealed the following information: reporter states the cause of the vibration was an internal component which had rubbed against the case and ultimately broke apart inside the engine. Pratt and whitney had problems with this type engine before and requested they send the engine to have the part removed and replace the component. The company has since replaced both engines. The second problem was that the wiring for the engine vibration light had been reversed and indicated the incorrect engine had the problem. Had they shut down the engine indicated, it would have been the good engine. Whoever built or installed the wiring harness reversed the connection.

Original NASA ASRS Text

Title: C550B CITATION DURING CLB HEARS A LOUD BANG AND THEN A SERIES OF CONSECUTIVE BANGS. R HAND ENG VIBRATION LIGHT ACTIVATED. INSTS INDICATED THE L HAND ENG WAS ERRATIC. SHORTLY AFTER FLC DECLARED AN EMER, THE L ENG STOPPED RUNNING.

Narrative: I DEPARTED SHV AT APPROX XX00 CST ON AN IFR FLT PLAN TO SAT. ALL ENG INSTS WERE NORMAL DURING THE TAXI, TKOF, AND CLB. DURING THE CLB PHASE OF FLT AT APPROX 25500 FT, A LOUD BANG WAS HEARD FOLLOWED BY A SERIES OF CONSECUTIVE BANGS. I IMMEDIATELY SCANNED THE ENG INSTS AND ANNUNCIATOR PANEL AND THE ONLY ANNUNCIATOR LIGHT ILLUMINATED WAS THE R HAND ENG VIBRATION LIGHT. I THEN HEARD A LOUD CONTINUOUS ROAR. I RETARDED THE R HAND THROTTLE, BUT THE LOUD ROAR CONTINUED. A SECOND LOOK AT THE ENG INSTS THE N1 FOR THE L HAND ENG WAS ERRATIC. I ADVANCED THE R HAND THROTTLE AND RETARDED THE L HAND THROTTLE AND THE ROARING NOISE BECAME QUIETER. THE R HAND ENG VIBRATION ANNUNCIATOR LIGHT REMAINED ILLUMINATED. I DECLARED AN EMER AND REQUESTED PRIORITY HANDLING WITH A RETURN TO SHV. AFTER THE L HAND THROTTLE WAS IN THE IDLE POS FOR APPROX 2-3 MINS IT STOPPED PRODUCING THRUST/QUIT RUNNING. I THEN PLACED THE L HAND THROTTLE IN THE CUT-OFF POS. THERE WAS NO ATTEMPT TO RESTART THE ENG. THE R HAND ENG VIBRATION LIGHT EXTINGUISHED AND SINGLE ENG LNDG PROCS WERE ACCOMPLISHED. THE TOTAL LENGTH OF THE FLT WAS APPROX 31 MINS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE CAUSE OF THE VIBRATION WAS AN INTERNAL COMPONENT WHICH HAD RUBBED AGAINST THE CASE AND ULTIMATELY BROKE APART INSIDE THE ENG. PRATT AND WHITNEY HAD PROBS WITH THIS TYPE ENG BEFORE AND REQUESTED THEY SEND THE ENG TO HAVE THE PART REMOVED AND REPLACE THE COMPONENT. THE COMPANY HAS SINCE REPLACED BOTH ENGS. THE SECOND PROB WAS THAT THE WIRING FOR THE ENG VIBRATION LIGHT HAD BEEN REVERSED AND INDICATED THE INCORRECT ENG HAD THE PROB. HAD THEY SHUT DOWN THE ENG INDICATED, IT WOULD HAVE BEEN THE GOOD ENG. WHOEVER BUILT OR INSTALLED THE WIRING HARNESS REVERSED THE CONNECTION.

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.

C550B citation during climb hears a loud bang and then a series of consecutive bangs. Right hand engine vibration light activated. Instruments indicated the left hand engine was erratic. Shortly after flight crew declared an emergency, the left engine stopped running.