Narrative:

En route to iah in a B727 cargo aircraft. We were cleared to 25000 ft. Out of about 19000 ft, the #3 oil filter bypass light illuminated. We proceeded with a precautionary engine #3 shutdown. We were then out of about 22000 ft. ZHU told us to descend immediately to 20000 ft for conflicting traffic at 21000 ft. We descended to 20000 ft and then ZHU cleared us to 19000 ft. At that time we declared an emergency for the engine shutdown and proceeded to iah for a landing. Traffic cleared us by about 1000 ft. Conflicting traffic was at 21000 ft, we were at 20000 ft. We were preoccupied with shutting down #3 engine and failed to maintain a good rate of climb before declaring an emergency. Supplemental information from acn 342717: the potential conflict arose due to the 'unfortunate' timing of our engine malfunction and the simultaneous occurrence of the handoff process from ft worth to houston. The first time we talked to houston was to let them know we were 'with' them and that we had an engine problem, which would likely result in shutting down one engine. As I recall, their first call to us was to descend due to co-altitude opposite direction traffic.

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Original NASA ASRS Text

Title: AN AIR CARGO B727 HAD TO SHUT DOWN ITS #3 ENG. EMER DECLARED. INFLT ENG SHUTDOWN. ACFT EQUIP PROB OIL FILTER BYPASS.

Narrative: ENRTE TO IAH IN A B727 CARGO ACFT. WE WERE CLRED TO 25000 FT. OUT OF ABOUT 19000 FT, THE #3 OIL FILTER BYPASS LIGHT ILLUMINATED. WE PROCEEDED WITH A PRECAUTIONARY ENG #3 SHUTDOWN. WE WERE THEN OUT OF ABOUT 22000 FT. ZHU TOLD US TO DSND IMMEDIATELY TO 20000 FT FOR CONFLICTING TFC AT 21000 FT. WE DSNDED TO 20000 FT AND THEN ZHU CLRED US TO 19000 FT. AT THAT TIME WE DECLARED AN EMER FOR THE ENG SHUTDOWN AND PROCEEDED TO IAH FOR A LNDG. TFC CLRED US BY ABOUT 1000 FT. CONFLICTING TFC WAS AT 21000 FT, WE WERE AT 20000 FT. WE WERE PREOCCUPIED WITH SHUTTING DOWN #3 ENG AND FAILED TO MAINTAIN A GOOD RATE OF CLB BEFORE DECLARING AN EMER. SUPPLEMENTAL INFO FROM ACN 342717: THE POTENTIAL CONFLICT AROSE DUE TO THE 'UNFORTUNATE' TIMING OF OUR ENG MALFUNCTION AND THE SIMULTANEOUS OCCURRENCE OF THE HDOF PROCESS FROM FT WORTH TO HOUSTON. THE FIRST TIME WE TALKED TO HOUSTON WAS TO LET THEM KNOW WE WERE 'WITH' THEM AND THAT WE HAD AN ENG PROB, WHICH WOULD LIKELY RESULT IN SHUTTING DOWN ONE ENG. AS I RECALL, THEIR FIRST CALL TO US WAS TO DSND DUE TO CO-ALT OPPOSITE DIRECTION TFC.

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.