A B757-200 in cruise at FL370 experienced the oil filter bypass light illuminate on the right engine and reduced power to flight idle. Light illumination caused by the oil screen contaminated with residual metal from the overhaul machining process.

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Attributes
ACN	413668
Time
Date	199809
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : arg
State Reference	AR
Altitude	msl bound lower : 37000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : instrument pilot : commercial
Experience	controller military : 6 controller non radar : 29 controller radar : 29 flight time last 90 days : 200 flight time total : 23000 flight time type : 1100
ASRS Report	413668
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At cruise, FL370, received 'right engine oil filter' message. Followed company abnormal checklists and with coordination with company flight control, reduced the right engine to idle power and kept it there for the rest of the flight. Normal descent, approach and landing to runway 2C in bna. ATC cooperated fully with requests for routing direct to outer marker to runway 2C. An emergency was not declared. No further problems. Callback conversation with reporter revealed the following information: the reporter stated the filter bypass light came on and company procedure was followed by reducing the right engine power to idle. The reporter said the air carrier mechanics sent to bna found the right oil screen filled with metal and on checking with maintenance control were advised this was a newly overhauled engine. The reporter said the oil screen was replaced and the engine run at high power for 20 mins, the screen was again removed and checked clean. The reporter stated the metal was from the machining process during engine buildup.

Original NASA ASRS Text

Title: A B757-200 IN CRUISE AT FL370 EXPERIENCED THE OIL FILTER BYPASS LIGHT ILLUMINATE ON THE R ENG AND REDUCED PWR TO FLT IDLE. LIGHT ILLUMINATION CAUSED BY THE OIL SCREEN CONTAMINATED WITH RESIDUAL METAL FROM THE OVERHAUL MACHINING PROCESS.

Narrative: AT CRUISE, FL370, RECEIVED 'R ENG OIL FILTER' MESSAGE. FOLLOWED COMPANY ABNORMAL CHKLISTS AND WITH COORD WITH COMPANY FLT CTL, REDUCED THE R ENG TO IDLE PWR AND KEPT IT THERE FOR THE REST OF THE FLT. NORMAL DSCNT, APCH AND LNDG TO RWY 2C IN BNA. ATC COOPERATED FULLY WITH REQUESTS FOR ROUTING DIRECT TO OUTER MARKER TO RWY 2C. AN EMER WAS NOT DECLARED. NO FURTHER PROBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FILTER BYPASS LIGHT CAME ON AND COMPANY PROC WAS FOLLOWED BY REDUCING THE R ENG PWR TO IDLE. THE RPTR SAID THE ACR MECHS SENT TO BNA FOUND THE R OIL SCREEN FILLED WITH METAL AND ON CHKING WITH MAINT CTL WERE ADVISED THIS WAS A NEWLY OVERHAULED ENG. THE RPTR SAID THE OIL SCREEN WAS REPLACED AND THE ENG RUN AT HIGH PWR FOR 20 MINS, THE SCREEN WAS AGAIN REMOVED AND CHKED CLEAN. THE RPTR STATED THE METAL WAS FROM THE MACHINING PROCESS DURING ENG BUILDUP.

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.