Electrical

Question 0

What is the minimum battery temperature for takeoff?

Answer 0

-20*C

FSM 1.8.1

Question 1

What is the maximum battery load meter reading for takeoff?

Answer 1

0.1

FSM 1.8.1

Question 2

After starter reset, when can you commence the start procedure for the other engine?

Answer 2

Battery load 0.40 or lower on MAIN BATT and
Starter SELECT light extinguished

FSM 3.5.3

Question 3

Under what conditions may the APU be used for engine starts even though a GPU is available?

Answer 3

1. If the APU is already operating
2. Engine starts at the gate are prohibited.
3. Engine start at the gate will delay or be delayed by passenger boarding of an adjacent aircraft.
   FSM 3.1.21

Question 4

What will be checked during the parking flow before turning Batteries All OFF?

Answer 4

All HYD PRESS indications are at zero.
(To keep gear doors from cycling)

FSM 3.19.4

Question 5

If electrical power is lost during or after the initiation of the Before Start Checklist, what checklist(s) must be accomplished?

Answer 5

The ORIGINATING and BEFORE START checklists must be restarted from the beginning after electrical power is restored.

FSM 3.1.22

Question 6

Must a tripped circuit breaker be recorded in the Maintenance Log?

Answer 6

Yes.

FOM 11.3.17

Question 7

What is the definition of blocking out for maintenance purposes?

Answer 7

Movement of the aircraft under its own power for the purpose of flight.

FOM 11.3.9

Question 8

What are the Primary Power Source Caution Lights when there are multiple amber caution lights illuminated?

Answer 8

#1 & #2 ENG HYD PUMP
#1 & #2 DC GEN
#1 & #2 AC GEN

FSM 2.1.3

Question 9

Why do we need to know what the Primary Power Source Caution Lights are?

Answer 9

So we know which E/A Checklist to call for if we have multiple amber caution lights.
(Some conditions result in multiple amber caution messages. When multiple lights are illuminated, the light associated with the primary power source for that system should be called.) FSM 2.1.3

Question 10

Can we reset/pull circuit breakers without direction from an emergency/abnormal checklist or maintenance control?

Answer 10

No.

FSM 2.1.2, FOM 11.3.17

Question 11

Approximately how long should the batteries last when on essential power?

Answer 11

60 minutes.

E/A Checklist 6.3

Question 12

List a combination of failures that would cause the EPCU (Electrical Power Control Unit) to enter emergency mode?

Answer 12

Both DC Generators and one TRU fail.

SDM 6-13

Question 13

What systems are powered by the 115-volt AC busses?

Answer 13

Fuel pumps
Anti-Icing
Standby HYD pump
TRUs
                                                                               SDM 6-16

Question 14

Can you provide external DC power and APU DC Gen power to the DC buses at the same time?

Answer 14

No.

SDM 4-7 and 6-10

Question 15

Does a green “DC EXT PWR” message displayed on the MFD electrical page indicate that the aircraft is receiving 28V from the GPU?

Answer 15

No, just that it is receiving external DC power, AND the DC External Power Switch is on.

SDM 6-8

Question 16

How can you verify that 28V DC power is being received from the GPU?

Answer 16

The MFD Electrical Page.

SDM 6-8

Question 17

Will a APU GEN overheat cause the APU to shut down?

GEN OHT amber advisory light

Answer 17

Yes.

SDM 4-4