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.
