Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
64 Cards in this Set
- Front
- Back
|
Sources of AC Power |
- 2 IDGs - APU Gen - AC GPU - 1 Inverter 250V - Ram Air Turbine |
|
|
How many IDGs are required to power both Buses? |
1 on ground and in flight |
|
|
APU can power both AC Buses |
-On ground -In flight up to FL 330 |
|
|
When can GPU power both AC Buses? |
On ground ONLY |
|
|
Primary source of AC power? |
IDGs |
|
|
IDG Switch "AUTO" |
System logic controls the contactor |
|
|
IDG Switch "OFF" |
Opens Contactor |
|
|
IDG Switch "DISC" |
Mechanically disconnects the constant speed drive (CSD) from the IDG.
Must be held for one second |
|
|
Amber LED light next to IDG switch |
HOTLOP condition
Oil Pressure drops below 140 +/- 25psi, or
Oil Temp reaches 335F |
|
|
Can you reconnect IDG in flight? |
No |
|
|
Secondary source of AC power? |
APU AC GPU |
|
|
What powers the APU's FADEC? |
BATT 1 |
|
|
What powers the APU START BUS? |
BATT 2 |
|
|
What power sources are required for APU Start? |
BATT 1 and 2
or
Batt 1 and DC GPU |
|
|
Minimum Battery voltage for APU start? |
21V |
|
|
Minimum Battery Temperature for APU start? |
-20 C |
|
|
AC GPU may be turned on... |
Button locations...
1. AC GPU panel (pwrs only ground service bus) 2. Opposite the FWD lav (pwrs only gnd svc bus) 3. Cockpit overhead panel |
|
|
Normal AC Electrical Priority |
- Onside (IDG) - Inside (APU) - Outside (GPU) - Cross-Side (Other IDG) |
|
|
What does the onboard inverter power? |
AC STANDBY BUS when normal AC power source is not available so the "A" igniters always have a source of power. |
|
|
Ram Air Turbine (RAT) |
Automatically deploys if both AC buses lose power during flight |
|
|
Emergency AC power source? |
RAT |
|
|
Maximum Altitude and speed for RAT deployment? |
There is no max alt or speed for deployment |
|
|
What does the RAT power? |
AC ESS BUS
(DC ESS BUS powered through the ESS TRU) |
|
|
Minimum speed for RAT? |
130kts |
|
|
What happens when RAT is deployed and speed is below 130kts? |
Load shedding.
The RAT will only power the AC ESS BUS.
BATTS will provide the AC STBY BUS (through inverter) and DC ESS BUS |
|
|
During RAT deployment (as it happens), What provides power? |
The aircraft batteries |
|
|
DC Electrical Power |
- 3 TRUs - 2 NiCd Batteries - DC GPU |
|
|
Primary source of DC power? |
3 TRUs
Each work in isolation to each other |
|
|
Secondary source of DC power? |
- Batteries - DC GPU |
|
|
How are the batteries charged? |
Constantly charged through an AC source through the TRUs, including the AC GPU and the RAT. |
|
|
How long will the batteries provide power? |
10 minutes |
|
|
Minimum voltage required to close the battery contactor? |
18.0V |
|
|
What can replace BATT 2 for APU Start? |
DC GPU |
|
|
How is DC GPU turned on? |
May only be turned on by a ground ramp button |
|
|
Electrical Power Distribution |
- 4 ICCs - 2 SPDAs |
|
|
Integrate Control Center (ICC) |
Basically, the ICCs collect and confirm the power is safe and then sends it to the SPDAs, which distributes it.
AOM II 14-05-20 for more info |
|
|
Secondary Power Distribution Assemblies (SPDA) |
An electrical load management unit that receives power from the ICCs and distributes it to the a/c systems via system logic. |
|
|
Thermal Circuit breakers are located in.. |
- cockpit side panels - ICCs |
|
|
Which remote circuit breakers require MTC action? |
Ones located in the ICCs.
SPDA remotes are electric and may be reset through the MCDU |
|
|
Where are electric circuit breakers located? |
SPDAs |
|
|
DC HOT BUS 1 Items... |
-Engine 1A/2A fire extinguisher -Engine Fuel Shutoff Valve 1 -Hydraulic Shutoff Valve 1 -Eng 1 Oil level indication -Courtesy/Svc lights -DC ceiling lights -Water and waste system |
|
|
DC HOT BUS 2 Items... |
-Eng 1b/2b Fire Extinguisher -Eng fuel shutoff valve 2 -Hydraulic shutoff valve 2 -Engine 2 oil level indication -CMC -Panel Refuel |
|
|
How many networks make up the electrical system? Why? |
2
Redundancy |
|
|
What happens if a power generating source fails. |
Bus ties automatically connect to provide no system degredation |
|
|
What monitors and controls the IDGs? |
Each one has a generator control unit (GCU) |
|
|
How long after deployment until the RAT supplies power? |
8 Seconds |
|
|
When is the RAT displayed on the Electrical Synoptic Page? |
When deployed. |
|
|
Automatic IDG disonnect Temperature? |
366F |
|
|
APU Gen Button - Pushed IN |
Automatic operation
This is the normal position |
|
|
APU Gen Button - Pushed OUT |
Opens APU Gen contactor and isolates the APU Gen from the AC BUS TIE |
|
|
AC GPU "AVAIL" |
AC GPU connected and quality requirements are satisfied |
|
|
AC GPU "IN USE" |
AC GPU is powering the AC electrical System |
|
|
How is the RAT anti-iced? |
It isn't, so make sure you exit and avoid icing conditions if possible. |
|
|
Where does the CSD get its oil? |
It has a separate oil supply and cooler. |
|
|
Describe the Batteries |
-Two -NiCad -22.8 VDC, 27A -Used for power up and as a backup for the DC ESS electrical system |
|
|
When is BATT 1(2) OVERTEMP indication triggered? |
whenever the battery temp reaches 70C for at least 2 seconds. |
|
|
LICC and RICC provide... |
AC and DC output |
|
|
AICC provides |
DC output only |
|
|
EICC provides |
AC and DC output. |
|
|
What items are load shed if one AC power source fails? |
-Right windshield heating -Galleys |
|
|
What items are in the Forward Electronic Bay? |
- Rat gen control - SPDA - EICC - BATT 1 - Static Inverter |
|
|
What items are in the Center Electronics bay? |
- Left ICC - Right ICC |
|
|
What items are in the Aft Electronics Bay? |
- APU Gen - AICC - BATT 2 |
|
|
What items are on the AC ESS BUS? |
- AC fuel pump 2A - ACMP 3A - SF-ACE 1 FLAP CH 1 AC FEED - SF-ACE 2 SLAT CH 2 AC FEED |
