Check on Indicators
1.Equipment Needed
None.
2.Preparations
·Put battery relays“BAT.RY1”and“BAT.RY2”at“OFF”position.
·All indicators on 7α panel,3Q panel and 2G panel go out,so do indicators 17α and 3G.
·Press buttons“TEST”and“DIM”,the indicators remain off.
·Button“DIM”is not live.
3.Testing Procedures
·Put battery relays“BAT.RLY1”and“BAT.RLY2”at“ON”position.
·Most indicators light up.Press buttons“TEST”and“DIM”,and all indicators light up and the master warning light 17α“ALARM”lights up.
·Press indicator 17α“ALARM”and it goes out.
·Press and hold button“TEST”on 7α panel.All indicators on 7α panel,3Q panel and 2G panel shall light up,so do indicators 17α and 3G.
·Press button“DIM”on 7α panel.Indicators on 7α panel,3Q panel and 2G panel dim out while the brightness of indicators 17α and 3G remains the same.
·Release button“DIM”to retrieve daytime illumination.Disconnect 17α indicator and release button“TEST”.
·Put battery relays“BAT.RLY1”and“BAT.RLY2”at“OFF”position and check if all related systems are reset to preparatory status.
Note:To avoid overheat of indicators,the indicator panel shall be dimmed during ground test or flight maintenance.