Exam Q's Flashcards
Where is the main access panel for the main electrical compartment?
Inside the nose landing gear compartment
The backup battery is powered by the :
Emergency DC bus 2
The main generators are connected to the electrical system by :
Main generator contactors
Is the APU available for use if the electrical system is in the emergency mode?
No. The system must be set to “Normal” to use the APU.
The “TEST” position on the backup battery switch simulates:
Emergency DC bus 1 failure.
Are the AUX generators identical to the MAIN generators?
Yes
A short circuit in the central DC bus results in loss of:
- Engine/APU Air start capability
- Battery charging
(Due Central bus disconnected)
When will the electrical system automatically switch from NORM to EMERG mode?
- At least one main generator switch on
- PWR SELECT switch in BATT
- Both main generators loss
(after a 2 second delay)
What are the two modes of operation for the aircraft electrical system?
Normal and Emergency
What could you assume if both the 26v “AC BUS OFF” lights are illuminated?
Only the 26v output of inverter #1 has failed, therefore to enable auto switching it must be turned off.
When will the FORWARD ACTUATOR light illuminate?
When the forward door is hydraulically blocked.
How many exits does the EMB120 have in the passenger cabin in case of emergency (including normal doors/exits)
4
Can the direct vision windows be removed by the crew?
Yes
How can you raise/lower the forward door?
Normally - Raised hydraulically, lowered manually
Can be raised and lowered manually also in case of hydraulic failure.
How many cycles can the forward door be operated without recharging its accumulator?
4
The transfer jet pumps are utilised to :
Keep the collector tank full.
A flashing fuel pump ON light indicates:
The pump is cycling (Automatically below 9PSI)
Firewall fuel shutoff valves are controlled by?
The Fire T Handles.
How is the collector tank kept at a constant level during normal flight?
- Two scavenger jet pumps
- Gravity feed
What will cause the emergency lights to illuminate?
- A failure of Emergency DC bus 1
- Placing Cockpit switch to ON
- Leaving Cockpit switch in ARM before turning PWR SELECT switch off
- CA Switch to on
- CA switch to test (Simulates emergency DC bus 1 failure)
What does a white light indicate when illuminated on the cabin attendants discrete call panel?
A call from the lavatory.
With the courtesy switch in the AUTO position what will happen?
The courtesy lights will illuminate when the main door is open regardless of the position of the PWR SELECT switch. (Hot battery bus)
Describe the power for the emergency lighting system?
Power is supplied from 3 rechargable battery packs,
Normally recharged from Emergency DC bus 1. They will illuminate with a failure of emergency DC bus 1 (Total electrical failure)
The batteries will last 17minutes and take approximately 22hrs to recharge.
When will the DOORS light illuminate on the MAP?
- Main cargo door open
- Forward entry door open
- Any service door open
