flight data recorder FDR

[elpilote]

is there any body who can help me about the regulation for the FDR, i mean this kind of stuff: from how many seat in an A/C do we need a FDR...

[BOAC]

Try JAROPS?

[Mad (Flt) Scientist]

Or, if US, Part 121:

§121.343 Flight recorders.

§121.344 Digital flight data recorders for transport category airplanes.

§121.344a Digital flight data recorders for 10-19 seat airplanes.

Or Part 135:

§135.152 Flight recorders.