ATA 24 - Electrical Flashcards
Description electrical system ?
Cf diagram
Engine GEN and APU: kVA, Volt, Hz, phase ?
90kVA
115/200V
400 Hz
Tri phases
EMER GEN: kVA, V, Hz, phase ?
5kVA
115/200V
400 Hz
Tri phases
Static inverter: kVA, V, Hz, phase ?
1kVA
115/200V
400 Hz
Single phase
Batteries: Ah and V ?
23 Ah
28 V
Max oil temperature IDG before FAULT ? Auto cut out at which temperature ?
180°C = FAULT
200°C = auto cut out
Inhibition of low pressure FAULT light on IDG at below which N2 ?
Below 14% N2
Time to charge batteries 100% ?
20min
Mini batterie voltage ? What does it ensure ?
25,5 V. It ensures 50% minimum capacity (cf SOP)
Priority of electrical sources ?
GEN of same side
EXT PWR
APU
GEN opposite side
<—[DC BAT]—>
—[DC BAT]—
> —[DC BAT]—<
meaning ?
DC BAT charges batteries above 1A
No charge
Batteries discharge above 1A
GALY and CAB pb controls which system ? What is the shed logic ?
AUTO: sheds main galley (ovens, …), in seat power, IFE if 1 GEN only
OFF: sheds also secondary galley ( coffee maker…)
COMMERCIAL pb controls which system ?
Cargo / Cabin lights
Water / Waste
Drain mast protection
IFE
Time for RAT deployment and EMER GEN to start ?
8 s
Gap filled by BAT
Conditions for auto RAT out ?
AC 1 + 2 out
And
Above 100 kt
On EMER GEN conditions, batteries cannot be charged. True or False ?
True
EMER GEN
When the aircraft is on ground :
- Below XXXkt, DC BAT BUS is automatically connected to the batteries.
- Below XXX kt, AC ESS BUS is automatically shed, leading to the loss of all display units.
100kt
50kt
Autonomy flight on BAT only ?
30min
Meaning of green breaker ?
ECAM monitored
After 1 min message on ECAM
Meaning of black breaker ?
Not ECAM monitored
Only associated with system fault message
Meaning of yellow breaker ?
May increase BAT life if tripped (old aircraft)
Meaning of red breaker ?
WTB. No reset.
How many times can you reset a breaker ?
1 time. Follow procedure
CLR pb effect on breaker ?
Inhibits any CB tripped on same panel
EMER CANCEL pb effect on breaker ?
Inhibits caution
On ground, if only the batteries are powering the emergency generation network, APU start is only available when the speed is below XX kt ?
100kt
Normal electrical distribution ? (Diagram)
GEN 1 — AC 1 bus — TR 1— DC 1 bus — DC BAT bus —DC ESS bus BAT 1 BAT 2
| | | |
AC ESS bus DC ESS bus Hot bus 1 Hot bus 2
+ Shed + Shed
GEN 2 — AC 2 bus — TR 2— DC 2 bus
When no other power is available in flight, the static inverter converts _____ power to AC power for the AC ESS bus; and ______ powers the DC ESS bus
BAT 1
BAT 2
When BAT FAULT light will illuminate ?
Charging current increase abnormally
Is it possible to parallel generators?
No
What is the significance of the circuit breakers on the overhead panel?
They may be operational in the Emergency Electrical Configuration.
If a TR 1 fails, show distribution diagram ?
GEN 1 — AC 1
|
AC ESS + shed — TR ESS — DC ESS
GEN 2 — AC 2 — TR 2 — DC 2 — DC BAT — DC 1
In flight, in case of loss of all main generators, EMERGENCY GENERATOR not running, the STATIC INVERTER supplies which bus ?
AC ESS bus ( APU, ENG start…)
What happens during the EMER GEN TEST if AC NORMAL BUSES are supplied ?
EMER GEN is supplied by Blue electrical pump if operating
+
AC ESS and DC ESS are connected to EMER GEN
(If only the batteries supply the aircraft:
The static inverter powers the AC ESS BUS.)
When is the DC BAT BUS supplied by the batteries ?
APU starting
and
AC1 & 2 lost with speed< 100kt
In emergency configuration, when is AC ESS SHED and DC ESS SHED BUS automatically shed ?
During RAT deployment
Is the ESS TR used when a TR is faulty ?
Yes
When GEN 1 or GEN2is selected to “OFF” position. Does GEN are still energized or de-energized ?
De-energized and line contactor opens
