PVS-Studio warning V557 for FlightGear

enum {
  ALL_EJECTION_SEATS = -1,
  MAX_EJECTION_SEATS = 10
};

int eseat_status[MAX_EJECTION_SEATS];

void
FGControls::set_ejection_seat( int which_seat, bool val )
{
  ....
  if ((which_seat >= 0) && (which_seat <= MAX_EJECTION_SEATS))
  {
    if ( eseat_status[which_seat] == SEAT_SAFED ||
         eseat_status[which_seat] == SEAT_FAIL )
  ....
}

This suspicious code was found in FlightGear project by PVS-Studio static code analyzer.
Warning message is:
V557 Array overrun is possible. The value of 'which_seat' index could reach 10. controls.cxx 1717

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/