OK,

it took a little digging but I found what the required 22 parameters for that aircraft would have been.

(1) Time;

(2) Pressure altitude;

(3) Indicated airspeed;

(4) Heading -- primary flight crew reference (if selectable, record discrete, true or magnetic);

(5) Normal acceleration (Vertical);

(6) Pitch attitude;

(7) Roll attitude;

(8) Manual radio transmitter keying, or CVR/DFDR synchronization reference;

(9) Thrust/power of each engine -- primary flight crew reference;

(10) Autopilot engagement status;

(11) Longitudinal acceleration;

(12) Pitch control input;

(13) Lateral control input;

(14) Rudder pedal input;

(15) Primary pitch control surface position;

(16) Primary lateral control surface position;

(17) Primary yaw control surface position;

(18) Lateral acceleration;

(19) Pitch trim surface position or parameters of paragraph (a)(82) of this section if currently recorded;

(20) Trailing edge flap or cockpit flap control selection (except when parameters of paragraph (a)(85) of this section apply);

(21) Leading edge flap or cockpit flap control selection (except when parameters of paragraph (a)(86) of this section apply);

(22) Each Thrust reverser position (or equivalent for propeller airplane); (1)



This is from:

[link to www.risingup.com]

Note that the cockpit flight door is NOT listed.

So the recorder was capable of more parameters than there were sensors for.

The parameter for the cockpit flight door was an unused block.

Note that it is far more expensive to install and wire the sensors than to use a generic flight recorder capable of more parameters.

So anyway, the OP's claim or thread title is DEBUNKED.