A320 CVR test (on FFS)
Can someone clarify what exactly an A320 CVR does during the test? In T/L: 'CVR test incorrect'. Not many more details given....
Looked at FCOM and not much clearer. How long does the test run for-only while button held on x-time? What tone(s) emitted?
If it makes any difference, the simulator is late 80's Rediffusion built.