Editing Dewoitine D.520 (section)

===Fire suppression system===
The D.520 had a fire-suppression system with a fire extinguisher activated from the cockpit. The engine was started by a simple but effective system, operating with compressed air. A Viet 250 air compressor charged several air bottles (one with a 12-litre capacity, as well as another eight litre tank, three smaller one litre units were matched to the weapons). The 12-litre air bottle was used for the brakes and later, for the Chauvière propeller's constant speed adjustment. The small air bottles provided up to 12 seconds at {{cvt|9000|m}} or 20 seconds at low level, before the Viet air compressor recharged them. The pilot had a complete set of cockpit instruments, and a ten-litre oxygen bottle located in the fuselage just behind his seat, with either a Munerelle or Gourdou oxygen regulator system mounted on the right instrument panel.<ref>Danel and Cuny 1966, pp. 226–227, 236–237.</ref> Equipment included a ''[[Radio Industrie Type Rl 537]]'' radio-receiver set, an OPL RX 39 [[reflector sight]] (less effective than the Revi system), a height-adjustable seat, and a sliding canopy with large, clear panels.<ref>Danel and Cuny 1966, pp. 236, 238, 250.</ref> Except over the long nose, the pilot's view was good, since he was seated quite high over the forward fuselage; however, no rear-facing mirrors were fitted.