I've been reading extensively again in the hopes I've missed some golden key that may unlock this box. So excuse my pasting. But this is good information.

L3 Avitation Recorders
FA2100
Storage Capacity Exceeds 25Hours of Flight Data
Regulatory Specifications
ARINC 404A, 573/717 (64/128 WPS), 747 (64/128/256/512 WPS)

~~~NTSB Report~~~
SSFDR rate 3072 bits/sec
continous 4 second data frames (3027 bits/sec x 4 sec = 12108 bits)
4 1-second subframes of 256 12-bit words

~~~Boeing FDR for Dummies~~~
A typical DFDR with 25 hours of flight data will have (25 hours) x (3600 sec/hour) / (4 seconds/frame) = 22500 frames.
22500 x 4 = 90000 subframes of 3072 bits each

~~~American 77 raw FDR~~~
MATH:
276480000 bits for 25 Hours
34560000 bytes

My File: American77.xxx <<-- More about this later
58275333 bytes
466202664 bits
154014.755 seconds
42.781 hours

##

Conclusion.
The raw FDR File provided by the NTSB most likely contains 42 Hours of Flight Data

And?

Are we much interested in what FLight 77 did on 910?

Hans

I am. It could be important. In a proper open investigation no stone should be left unturned.

And the fact that it is this big lends to it's authenticity.

Also, for those that have offered 'decoding' assistance. It is much appreciated but I think there is a misconeption about what 'decoding' means in reference to raw FDR data.
There is a document which is so secret and locked away that if you don't have it, you have no hope of actually translating anything. And
If you don't know what a 'data frame layout' or 'logicial frame layout' means by definition, then you have no hope of actually translating anything as well.

This is what the first subframe looks like in the raw.

/bump for Anti-S

And what are the next steps you wanna make?

It sounds more interesting the more I think about it.

This is, in fact, quite true. Without the major frame description, it's quite difficult to figure out what's going on. Maybe it would be possible to reverse engineer some of the fields from the CSV file, assuming there was no preprocessing, but even that is a long-shot. Even still, it may be possible to (easily) reverse engineer the major and minor framing synching information, after that.. who knows.

I presume this means, though, that no frame-description is available.

It could be very important where the aircraft was in the time prior to 9/11 IMO.

/bump for Parmenides