Narrative:

[We] encountered a TCAS RA that resulted in a near miss during ILS approach at a us air base. Evasive action was required to avoid a mid air collision. Near miss and TCAS RA; aircraft configuration was gear down and flaps 30. While descending in VMC; traffic suddenly appeared with no prior TA resulting in a RA climb advisory greater than 2;000 ft/minute. Target aircraft was 12 o'clock; less than one mile and at the same altitude. I advanced the thrust to go around EPR and pitched up in an attempt to follow the TCAS advisory but the aircraft was unable to meet the climb requirement. I then made an immediate aggressive right turn to avoid a mid air collision while climbing 800 ft. Unknown traffic was observed passing our right wing. After reporting a TCAS climb to approach we maneuvered right traffic in VMC and rejoined the ILS. The 2nd ILS approach and landing were uneventful. The target aircraft was seen by myself; the flight engineer and the flight mechanic but the event happened too quickly to positively identify the aircraft type. After reducing thrust following the RA it was noted that the #3 engine displayed an exceedance warning. After landing we completed the excessive RPM checklist and taxied to parking. The exceedance page displayed engine #3 had an N1 RPM of 109.0 for 10 seconds. Exceedance was entered as a maintenance discrepancy in the aircraft log. Mechanic performed required maintenance actions; engine run was normal; and discrepancy was cleared. Engine operation was normal on the next leg.

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Original NASA ASRS Text

Title: A B747 Captain reported a TCAS RA during an ILS approach to a U.S. Airbase requiring a climb and evasive action. N1 limit was exceeded on the number three engine during the manuver.

Narrative: [We] encountered a TCAS RA that resulted in a near miss during ILS approach at a U.S. Air Base. Evasive action was required to avoid a mid air collision. Near Miss and TCAS RA; aircraft configuration was Gear Down and flaps 30. While descending in VMC; traffic suddenly appeared with no prior TA resulting in a RA Climb advisory greater than 2;000 FT/minute. Target aircraft was 12 o'clock; less than one mile and at the same altitude. I advanced the thrust to Go Around EPR and pitched up in an attempt to follow the TCAS advisory but the aircraft was unable to meet the climb requirement. I then made an immediate aggressive right turn to avoid a mid air collision while climbing 800 FT. Unknown traffic was observed passing our right wing. After reporting a TCAS Climb to Approach we maneuvered right traffic in VMC and rejoined the ILS. The 2nd ILS approach and landing were uneventful. The target aircraft was seen by myself; the Flight Engineer and the Flight Mechanic but the event happened too quickly to positively identify the aircraft type. After reducing thrust following the RA it was noted that the #3 engine displayed an exceedance warning. After landing we completed the Excessive RPM checklist and taxied to parking. The exceedance page displayed engine #3 had an N1 RPM of 109.0 for 10 seconds. Exceedance was entered as a maintenance discrepancy in the Aircraft Log. Mechanic performed required maintenance actions; engine run was normal; and discrepancy was cleared. Engine operation was normal on the next leg.

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.