Warning lights / diagnosis Flashcards
When a light comes on you understand what's happening
(CL) LOW OIL PRESSURE elec panel
Illuminated (amber) – generator drive oil pressure is below minimum operating
limits.
(CL) HIGH OIL TEMP elec. panel
Illuminated (amber) - generator drive oil temperature exceeds operating limits.
(CL + NG) TRANSFER BUS OFF
Illuminated (amber) – related transfer bus is inactive.
(CL) BUS OFF
Illuminated (amber) – related generator bus is inactive.
(CL + NG) GEN OFF BUS or APU GEN OFF BUS
Illuminated (blue)- related generator (IDG for NG) is not supplying the generator bus.
(NG) BATT DISCHARGE
Illuminated (amber) – with BAT switch ON, excessive battery discharge detected.
(NG) TR UNIT
Illuminated amber:
On the ground – any TR has failed.
In flight –
TR1 failed; or
TR2 and TR3 failed.
(NG) ELEC
Illuminated (amber) – a fault exists in DC power system or standby power system.
Note: Operates only with airplane on ground.
(NG) DRIVE
Illuminated (amber) – Integrated drive generator (IDG) low oil pressure caused by one of the following:
• IDG failure
• engine shutdown
• IDG automatic disconnect due to high oil temperature
• IDG disconnected through generator drive DISCONNECT switch.
(NG) STANDBY PWR OFF
Illuminated (amber) – one or more of the following busses are unpowered:
• AC standby bus
• DC standby bus
• battery bus.
(CL) STANDBY PWR OFF
Illuminated (amber) - AC standby bus is inactive.
(NG) SOURCE OFF
Illuminated (amber) – no source has been manually selected to power the related
transfer bus, or the manually selected source has been disconnected
• if a source has been selected to power the opposite transfer bus, both transfer busses are powered.
(NG) OVERHEAT (Hyd. Panel)
Illuminated (amber) – Hydraulic fluid used to cool and lubricate the corresponding electric motor driven pump has overheated or the pump itself has overheated.
(CL+NG) LOW PRESSURE (Hyd. Panel)
Illuminated (amber) – output pressure of associated pump is low.
Note: When an engine fire switch is pulled, the low pressure light is deactivated.
(NG) LOW PRESSURE (A or B) (Flight control panel)
Illuminated (amber) –
indicates low hydraulic system (A or B) pressure to ailerons, elevator and rudder
deactivated when associated FLIGHT CONTROL switch is positioned to STBY RUD and standby rudder shutoff valve opens.
(CL+NG) LOW QUANTITY (Flight control panel, standby hyd section)
Illuminated (amber) –
Indicates low quantity in standby hydraulic reservoir.
Always armed.
(CL+NG) LOW PRESSURE (Flight control panel, standby hyd section)
Illuminated (amber) –
Indicates output pressure of standby pump is low.
Armed only when standby pump operation has been selected or automatic standby function is activated.
(CL+NG) STBY RUD ON (Flight control panel, standby hyd section)
Illuminated (amber) - indicates the standby hydraulic system is commanded on to pressurize the standby rudder power control unit.
(CL) LOW PRESSURE (Flight control panel, A or B)
Illuminated (amber) –
• indicates low hydraulic system (A or B) pressure to ailerons, elevator and rudder
• deactivated when associated FLT CONTROL switch is positioned to STBY RUD and standby rudder shutoff valve opens
• the A system light indicates A system pressure is low when full RPR pressure is commanded.
Note: The A system light will remain illuminated for approximately five seconds after A hydraulic system is activated.
(NG) YAW DAMPER
Illuminated (amber) – yaw damper is not engaged.
(NG) FEEL DIFF PRESS
Armed when the TE flaps are up or down.
Illuminated (amber) -
• indicates excessive differential pressure in the elevator feel computer.
Note: Excessive differential pressure can be caused by erroneous activation of the Elevator Feel Shift module.
(CL) FUEL VALVE CLOSED (Extinguished / Bright blue / dim blue / off)
Extinguished: related engine shutoff valve is open
Bright blue: valve is in transit, or valve position and engine start lever or engine fire switch position disagree
Dim: valve is closed
(CL) The fuel temperature indicator indicates the fuel temperature in which fuel tank?
No. 1
(CL) VALVE OPEN (crossfeed) (Off / Dim / Bright)
Off - Crossfeed valve closed
Bright - Valve in transit or valve position and crossfeed selector disagree
Dim - Crossfeed valve is open
(CL) FILTER BYPASS
Off - fuel filter operating normally
Illuminated - impending fuel filter bypass due to a contaminated filter.
(CL) LOW PRESSURE (fuel pump)
On - fuel pump output pressure is low and FUEL PUMP switch is ON.
