Narrative:

[We were] at cruise; near trm; FL240 as assigned by ATC; received resolution advisory (RA); 'traffic; traffic;' followed immediately by; 'descend; descend.' captain flying disengaged autopilot and descended; first officer monitoring notified ATC that we were responding [due] to an RA. First officer observed an flight attendant-18 merge from high-to-low; pass co-altitude at 1;200 ft; left to left; opposite direction; then the flight attendant-18 abruptly climbed back above FL250 to re-enter it's block in a presidential tfr near psp. ATC then said; 'traffic alert!'; but the event was already over. ATC informed us that; 'it looks like he went below his altitude.' total altitude deviation estimated to be approximately 300 ft; from FL240 to FL237 back to FL240. Maneuver was assessed to be fairly benign with no passenger disruptions noted. Captain and first officer observed an additional flight attendant-18 approximately 4;000 ft above; 8 miles; at our 11 o'clock position; in-flight refueling from a kc-10. This flight appeared established in the presidential tfr and was not a factor. Having situational awareness of both fighters; the first officer then informed ATC that we were climbing back to FL240 and ATC acknowledged. Captain climbed the aircraft back to FL240 and re-engaged the autopilot. We continued on to our destination and landed uneventfully.conduct TCAS training for military fighter pilots for a better understanding of flight path geometry; rates of closure and the requirement for a commercial airliner to respond to a resolution advisory.

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Original NASA ASRS Text

Title: An air carrier crew level at FL240 near PSP; took evasive action from a F-18 TCAS RA after the fighter strayed from the Presidential TFR airspace.

Narrative: [We were] at cruise; near TRM; FL240 as assigned by ATC; received Resolution Advisory (RA); 'TRAFFIC; TRAFFIC;' followed immediately by; 'DESCEND; DESCEND.' Captain flying disengaged autopilot and descended; First Officer monitoring notified ATC that we were responding [due] to an RA. First Officer observed an FA-18 merge from high-to-low; pass co-altitude at 1;200 FT; left to left; opposite direction; then the FA-18 abruptly climbed back above FL250 to re-enter it's block in a Presidential TFR near PSP. ATC then said; 'TRAFFIC ALERT!'; but the event was already over. ATC informed us that; 'it looks like he went below his altitude.' Total altitude deviation estimated to be approximately 300 FT; from FL240 to FL237 back to FL240. Maneuver was assessed to be fairly benign with no passenger disruptions noted. Captain and First Officer observed an additional FA-18 approximately 4;000 FT above; 8 miles; at our 11 o'clock position; in-flight refueling from a KC-10. This flight appeared established in the Presidential TFR and was not a factor. Having situational awareness of both fighters; the First Officer then informed ATC that we were climbing back to FL240 and ATC acknowledged. Captain climbed the aircraft back to FL240 and re-engaged the autopilot. We continued on to our destination and landed uneventfully.Conduct TCAS training for military fighter pilots for a better understanding of flight path geometry; rates of closure and the requirement for a commercial airliner to respond to a Resolution Advisory.

Data retrieved from NASA's ASRS site 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.