Warning lights / diagnosis

Question 1

(CL) LOW OIL PRESSURE elec panel

Answer 1

Illuminated (amber) – generator drive oil pressure is below minimum operating
limits.

Question 2

(CL) HIGH OIL TEMP elec. panel

Answer 2

Illuminated (amber) - generator drive oil temperature exceeds operating limits.

Question 3

(CL + NG) TRANSFER BUS OFF

Answer 3

Illuminated (amber) – related transfer bus is inactive.

Question 4

(CL) BUS OFF

Answer 4

Illuminated (amber) – related generator bus is inactive.

Question 5

(CL + NG) GEN OFF BUS or APU GEN OFF BUS

Answer 5

Illuminated (blue)- related generator (IDG for NG) is not supplying the generator bus.

Question 6

(NG) BATT DISCHARGE

Answer 6

Illuminated (amber) – with BAT switch ON, excessive battery discharge detected.

Question 7

(NG) TR UNIT

Answer 7

Illuminated amber:
On the ground – any TR has failed.

In flight –
TR1 failed; or
TR2 and TR3 failed.

Question 8

(NG) ELEC

Answer 8

Illuminated (amber) – a fault exists in DC power system or standby power system.
Note: Operates only with airplane on ground.

Question 9

(NG) DRIVE

Answer 9

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.

Question 10

(NG) STANDBY PWR OFF

Answer 10

Illuminated (amber) – one or more of the following busses are unpowered:
• AC standby bus
• DC standby bus
• battery bus.

Question 11

(CL) STANDBY PWR OFF

Answer 11

Illuminated (amber) - AC standby bus is inactive.

Question 12

(NG) SOURCE OFF

Answer 12

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.

Question 13

(NG) OVERHEAT (Hyd. Panel)

Answer 13

Illuminated (amber) – Hydraulic fluid used to cool and lubricate the corresponding electric motor driven pump has overheated or the pump itself has overheated.

Question 14

(CL+NG) LOW PRESSURE (Hyd. Panel)

Answer 14

Illuminated (amber) – output pressure of associated pump is low.
Note: When an engine fire switch is pulled, the low pressure light is deactivated.

Question 15

(NG) LOW PRESSURE (A or B) (Flight control panel)

Answer 15

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.

Question 16

(CL+NG) LOW QUANTITY (Flight control panel, standby hyd section)

Answer 16

Illuminated (amber) –

Indicates low quantity in standby hydraulic reservoir.
Always armed.

Question 17

(CL+NG) LOW PRESSURE (Flight control panel, standby hyd section)

Answer 17

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.

Question 18

(CL+NG) STBY RUD ON (Flight control panel, standby hyd section)

Answer 18

Illuminated (amber) - indicates the standby hydraulic system is commanded on to pressurize the standby rudder power control unit.

Question 19

(CL) LOW PRESSURE (Flight control panel, A or B)

Answer 19

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.

Question 20

(NG) YAW DAMPER

Answer 20

Illuminated (amber) – yaw damper is not engaged.

Question 21

(NG) FEEL DIFF PRESS

Answer 21

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.

Question 22

(CL) FUEL VALVE CLOSED (Extinguished / Bright blue / dim blue / off)

Answer 22

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

Question 23

(CL) The fuel temperature indicator indicates the fuel temperature in which fuel tank?

Answer 23

No. 1

Question 24

(CL) VALVE OPEN (crossfeed) (Off / Dim / Bright)

Answer 24

Off - Crossfeed valve closed
Bright - Valve in transit or valve position and crossfeed selector disagree
Dim - Crossfeed valve is open

Question 25

(CL) FILTER BYPASS

Answer 25

Off - fuel filter operating normally

Illuminated - impending fuel filter bypass due to a contaminated filter.

Question 26

(CL) LOW PRESSURE (fuel pump)

Answer 26

On - fuel pump output pressure is low and FUEL PUMP switch is ON.