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1，FDR CONTROL LOGIC:

START: Recordings will only take place if either N2 is greater than 20 %RPM.（实测）

STOP: Stop recording will only take place if either N2 is less than 20 %RPM.

还有一个通用性说明如下：

The FDRS operates automatically when one of the engines is in operation((Engine running is when N2 > 50%)) or the airplane is in the air. lt also operates on the ground when you put theTEST/NORMAL switch on the flight recorder test module in the TESTposition.

2，QAR CONTROL LOGIC:

START: Recordings will only take place if either N2 is greater than 20 %RPM.

STOP: On the ground up to about 25 seconds after last engine shutdown.

3，WQAR 2G & 3G CONTROL LOGIC: BOEING

START: On the ground with one engine running (~ 20% of N2).

STOP: On the ground up to about 10 seconds after last engine shutdown.

4，WQAR 2G/3G LOGIC: Teledyne STC

START: On the ground with forward entry door is close.

STOP: On the ground up to about about 3 minutes after last engine shutdown.