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2. APU Generator

B

1

0

(M) Except for ER operations, may be inoperative provided APU is not used.

Maintenance will pull and collar APU CONT #1 – left EER C-13 and APU CONT #2 – right EER C-11.

Flight crew may accomplish this task if properly qualified and authorised.
None required.

An Inoperative Placard will be placed above AUX PWR Switch on EPCP and will be noted on ADLS.

3. Transformer-Rectifier

Units (TRUs)
B

5

4

(M) May be inoperative provided:

a) Both Generators are operative,

b) Both essential TRUs are operative,

c) Auxiliary TRU is operative,

d) APU Generator is operative,

e) Both Battery chargers are operative,

f) Both Main Aeroplane Batteries are operative, and

g) Inoperative TRU circuit breaker on the Power Distribution Box is pulled and collared.
Maintenance will pull and collar affected TRU CONTROL CB on Power Distribution Box (PDB). Maintenance will ensure AUX TRU is operative and both essential TRUs are operative.
Flight crew may accomplish this task if properly qualified and authorised.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

4. Main Aeroplane

Battery Chargers
B

2

1

(M) May be inoperative provided:

a) Both Engine Generators are operative,

b) APU Generator is operative,

c) Associated Battery Charger circuit breaker on the Power Distribution Box is pulled and collared, and

d) Standby Electrical System is operative.


Maintenance will pull and collar CB of associated Battery Charger (located on PDB). Maintenance can verify associated Battery Charger by utilizing Operational Test located in AMM Chapter 24-34-03.

Flight crew may accomplish this task if properly qualified and authorised.
None required.

An Inoperative Placard will be placed above Battery Charger Circuit Breakers and will be noted on ADLS.

5. Main Aeroplane

Batteries
B

2

1

(M) May be inoperative provided:

a) There are no other electrical power source failures,

b) Associated Battery cables are disconnected and secured,

c) Associated Battery Charger circuit breaker on the Power Distribution Box is pulled and collared, and

d) Associated battery circuit breaker is pulled and collared.


Maintenance will ensure:

  1. Standby Electrical System is operative,

  2. Pull and collar associated "BATT CHGR" and "BATT CONT" CB, and

  3. Associated battery cables will be disconnected and secured. Refer to AMM chapter 24-34-00.

None required.

An Inoperative Placard will be placed on affected "BATT 1, BATT 2" Master Switch on the Electric Master Panel and will be noted on ADLS.




B

2

1

(M)(O) May be inoperative provided:

a) Aeroplane is operated in day VMC,

b) Standby Electrical System is operative,

c) Associated Battery cables are disconnected and secured,

d) Associated Battery Charger circuit breaker on the Power Distribution Box is pulled and collared, and

e) Associated battery circuit breaker is pulled and collared.
Maintenance will pull and collar associated "BATT CHGR" and "BATT CONT" CB. In addition, associated battery cables will be disconnected and secured. Refer to AMM chapter 24-34-00.

Flight crew will ensure aeroplane is operated in day VMC only.

An Inoperative Placard will be placed on affected "BATT 1, BATT 2" Master Switch on the Electric Master Panel and will be noted on ADLS.

6. Battery Ammeters

(Overhead Panel)
C

2

0

May be inoperative provided:

a) Associated voltmeter is operative, and

b) Both battery charger fail messages are operative.


None required.

None required.

An Inoperative Placard will be placed on affected Battery Ammeter and will be noted on ADLS.




C

2

0

May be inoperative provided battery ammeter indications are available in EICAS.

None required.

None required.

An Inoperative Placard will be placed on affected Battery Ammeter and will be noted on ADLS.

(EICAS Indication)

C

2

0

May be inoperative provided battery ammeter in overhead panel are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

7. Battery Voltmeters

(Overhead Panel)
C

2

0

May be inoperative provided associated ammeter is operative.

None required.

None required.

An Inoperative Placard will be placed on Voltmeter and will be noted on ADLS.




C

2

0

May be inoperative provided Battery Voltmeter indications are available on EICAS.

None required.

None required.

An Inoperative Placard will be placed on Voltmeter and will be noted on ADLS.

(EICAS Indication)

C

2

0

May be inoperative provided Battery Ammeter indications are available on EICAS.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.




C

2

0

May be inoperative provided Battery Voltmeters in overhead panel are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

8. Electrical Power

System EICAS

Displays























1) L Gen Voltmeter

C

1

0

May be inoperative provided the associated frequency and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

2) L Gen Frequency

Meter


C

1

0

May be inoperative provided the associated voltmeter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

3) L Gen Loadmeter

C

1

0

May be inoperative provided the associated voltmeter and frequency meter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

4) R Gen Voltmeter

C

1

0

May be inoperative provided the associated frequency and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

5) R Gen Frequency

Meter


(continued)

C

1

0

May be inoperative provided the associated voltmeter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

8. Electrical Power

System EICAS

Displays (cont’d)























6) R Gen Loadmeter

C

1

0

May be inoperative provided the associated voltmeter and frequency meter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

7) APU Voltmeter

C

1

0

May be inoperative provided the associated frequency meter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

8) APU Frequency

Meter


C

1

0

May be inoperative provided the associated voltmeter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

9) APU Loadmeter

C

1

0

May be inoperative provided the associated voltmeter and frequency meter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

10) Ext AC Pwr Voltmeter

C

1

0

May be inoperative provided the associated frequency meter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

(continued)



D

1

0

May be inoperative provided the associated external AC power is not used.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

8. Electrical Power

System EICAS

Displays (cont’d)























11) Ext AC Pwr

Frequency Meter
C

1

0

May be inoperative provided the associated voltmeter and loadmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.



D

1

0

May be inoperative provided the associated external AC power is not used.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

12) Ext AC Loadmeter

C

1

0

May be inoperative provided the associated frequency and voltmeter are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.




D

1

0

May be inoperative provided the associated external AC power is not used.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.

13) Main, Essential and

AUX TRU Voltmeters


(continued)

C

5

0

May be inoperative provided the associated loadmeters are operative.

None required.

None required.

An Inoperative Placard will be placed in a prominent position to be seen by flight crew and will be noted on ADLS.


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