McDonnell Douglas Undifferentiated or Other Model
Dispatch Dispatcher
Human-Machine Interface; Time Pressure
ATC Issue All Types; Conflict NMAC; Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types
Air Traffic Control Issued Advisory / Alert; Flight Crew Returned To Departure Airport; Flight Crew Took Evasive Action
Human Factors; Procedure; Airspace Structure
On an unpressurized flight between SMF-ZZZ at cruise altitude 10;000 FT; crew got a TA on an aircraft below them and climbing. At approximately 4 miles ATC gave them a traffic alert at the same time they got an RA with a climb command. As the flight was climbing First Officer spotted the other aircraft coming right at them and First Officer said 'Turn Left.' Captain rolled aircraft into a 34-45 degree left bank as the Controller was advising them to turn right which they could not comply with. Both aircraft were climbing with a constant separation of 100 FT. The First Officer; watching the other aircraft; said; 'Descend Descend!' Captain lowered the nose and the other aircraft passed Aircraft X at a close range. (Aircraft X climbed to approximately 11;300 FT before descending back to 10;000 FT and on course.It appears both aircraft were near the borders of two sectors. Each aircraft was on a different frequency from the other but in the same immediate airspace.Controllers need to pay attention to all aircraft in their sector as well as the neighboring sectors during hand-offs and provide appropriate horizontal and vertical separation.
An air carrier aircraft in cruise at 10;000 MSL on an unpressurized ferry flight suffered a close encounter with an unidentified opposite direction aircraft in a climb.