- 31 - Indicating Recording system
31-01 Clocks
31-02 Flight Data Recorder (FDR)
31-07 Aircraft Condition Monitoring System (ACMS)
31-08 Common Display System (CDS)
31-09 Remote Light Sensor System
31-10 Speed Reference Selector
31-12 Takeoff Warn Test Switch
31-14 Takeoff Config Light