44 Questions
What is the purpose of the External Door Control switch?
To open and close the MED when securing the aircraft.
What powers the essential bus and the AUX pump when the momentary switch is selected to the CLOSE position?
The aircraft batteries.
Where is the Emergency Entry Switch located?
At the bottom of the exterior of the MED.
How is the status of the doors indicated to the flight crew?
The status of the doors is indicated to the flight crew via the Crew Alerting System (CAS) messages.
What are the different sections into which aircraft doors are divided?
Aircraft doors are divided into the following sections: Main Entrance Door, Emergency Exits, Baggage Compartment Doors, Tail Compartment Door, Service Doors, and Security System.
What system is used as the power source for the Backup System of the MED in the event of a minor crash condition?
forward emergency battery (eBATT)
What prevents the MED from opening inflight?
system interlocks (fail-safes)
How many switches are capable of commanding the MED? What is the capability of control for each switch?
Four switches; control varies depending on the switch used
What does the DOOR SAFETY pushbutton on the Cockpit Overhead Panel do?
prevent the closing operation of the main cabin door
What must the secondary locking mechanism do in order for the latch mechanism to operate?
Release and disengage the pin from the detent
How is the visual locked indication identified on the locked indication flag?
Single orange dot
What prevents cabin pressurization until the MED is fully closed, latched, and locked?
A 'door open' signal from three proximity switches
What is the purpose of the passively-inflated bulb type seals around the door's perimeter?
To maintain cabin pressure
What is the function of the MED hydraulic system?
To close the door and control its opening
What happens when a MED switch is selected to the CLOSED position?
Electrical power is routed to the auxiliary hydraulic pump, which supplies 3000 psi to the main entry door hydraulic system.
In the event of electrical failure, how can the MED be retracted with the hydraulic system operating?
The selector valve manual override knob may be rotated to retract the MED.
What is the requirement for the main entry acoustic door during taxi, takeoff, and landing operations?
The main entry acoustic door must be fully open.
How is the MED OPERATOR'S INDICATION DOOR OPEN illuminated when the MED is not fully closed?
amber light
What type of power is used to open the MED on the first flight of the day, as per the Airplane Flight Manual?
electrical power from the Fwd Erner Battery
What is the MED considered as in abnormal landing cases except for a water landing?
an emergency exit
How many over-wing EEDs are installed on the aircraft?
four
What system supports the main entrance door and the over-wing EEDs?
the emergency lighting system
Where are the operating instructions located for the main entrance door and the over-wing EEDs?
next to each access door
The MED is considered as a normal landing case except for a water landing.
True
The External Door Control switch can be used to open and close the Main Entrance Door (MED) when securing the aircraft.
True
The latching mechanism is operated by an electro-mechanical actuator powered from the Right Essential DC bus.
False
The Vestibule Switch is capable of commanding both opening and closing of the MED.
False
The MED Operator's Indication Light illuminates amber when the MED is fully closed, latched, and locked.
False
The damper cylinder is used to control the opening of the Main Entry Door (MED) as it extends.
True
The auxiliary hydraulic pump supplies 3000 psi to the main entry door hydraulic system.
True
The selector valve manual override knob cannot be rotated to retract the MED in the event of electrical failure.
False
The MAU Monitor and Warning System (MWS) communicates the position information of open doors to generate appropriate CAS messages.
True
The main entry acoustic door must be manually opened and stowed during taxi, takeoff, and landing operations.
False
The MED is considered abnormal in water landing cases.
False
The secondary locking mechanism secures the primary locking mechanism only in the latched position.
False
The visual locked indication is via a single orange dot on the unlocked indication flag.
False
The MED may be operated by the MED operation switches only during normal door operation.
False
The door incorporates two actively-inflated bulb type seals around its perimeter to maintain cabin pressure.
False
The MED hydraulic system is used to open the door using a closed-circuit damper cylinder that generates a controlled free-fall.
True
In the event of electrical failure, the MED can be retracted with the hydraulic system operating without any manual intervention.
False
The MED OPERATOR'S INDICATION light illuminates amber when the MED is fully closed.
False
The DOOR OPEN legend remains illuminated until the door is closed and locked after being selected to the OPEN position.
True
The EXTERNAL BATTERY switch must be selected to ON if external power is not applied to the aircraft for opening or closing the main door from outside the aircraft.
True
The main entrance door and the four removable cabin EEDs are the primary and most immediate path for exiting the aircraft in case of abnormal operations.
True
Test your knowledge about the internal sensor and locking mechanisms of the aduator, including terms such as 'locked' and 'unlocked' as well as visual indicators for locked position.
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