Ground Proximity Warning System (GPWS)
Ground Proximity System Test (SYS TEST) Switch

Push – momentarily on the ground:

  • BELOW G/S and GPWS INOP lights illuminate.
  • TERR FAIL and TERR TEST show on navigation displays.
  • PULL UP and WINDSHEAR alerts illuminate.
  • GLIDE SLOPE, PULL UP, and WINDSHEAR aurals sound.
  • Terrain display test pattern shows on navigation displays.
  • Terrain caution aural sounds and TERRAIN caution message
    shows on navigation displays.