ATA 52 Doors

Question 1

What component keeps the cockpit door locked?

Answer 1

Three electrical release strikes

Question 2

At what windspeed must the passenger doors not be opened?

Answer 2

65 knots

Question 3

What is the purpose and method of operation of the safety pin on the passenger door?

Answer 3

Blocks the door even if there is a double mechanical failure in the locking mechanism and the lifting mechanism

Prevents any upward door movement

Question 4

How is damping achieved by the door damper cylinder?

Answer 4

Hydraulic movement through a restrictor as the operating rods extend or retract

Question 5

How is disarming of the retractable pin confirmed on the overwing emergency exits?

Answer 5

Extinguishing of the ‘SLIDE ARMED’ indicator light next to the exit

Question 6

Which one of the A321 emergency exit doors is the 73” door?

Answer 6

FWD left

Question 7

What extends into the cargo door frame when the locking handle is put back flush with the door?

Answer 7

Drift pins

Question 8

What is the purpose of the double check valve in the cargo door opening system?

Answer 8

Depressurises the cargo door system after operation and prevents loss of reservoir pressure and hydraulic fluid after a leak

Question 9

What happens to the signal created by the operation of the manual selector valve on the cargo door opening system to the open position?

Answer 9

Sent through the LGCIU 2 which starts the yellow electric pump to supply hydraulic fluid

Question 10

When closing the cargo doors using hydraulic power, why will the door operation lever not immediately move to the CLOSE position?

Answer 10

The spring loaded blocking system prevents the handle moving further than the INTERMEDIATE position until both sides of the actuator are pressurised

This prevents a sudden movement of the door when the actuator mechanical lock is released

Question 11

At what pressure in the blocking piston will it allow the manual selector valve to reach the CLOSE position?

Answer 11

290 psi (20 bars)

Question 12

Why must the cargo door be locked and latched within a minute when using the electric pump?

Answer 12

To prevent re-opening due to internal leakage

Question 13

Explain the operation of the cargo door locking actuator?

Answer 13

Hydraulic pressure forces a piston with a locking clamp through a locking bushing, squeezing the locking clamp closed and then open again when it gets past the bushing

Lifts a lever and detection pin which makes the circuit in a proximity switch

Sleeve assembly is pushed between the claws and locks the system

Hydraulic fluid has to be ported behind the claws to reverse the process

Question 14

What extends or retracts the three-latch tenons of the cockpit door when operated manually?

Answer 14

Spring-loaded D-ring assembly

Question 15

When does the OPEN light come on the CDLS panel on the centre pedestal?

Answer 15

Microswitch in the middle electrical release strike senses that the middle tenon has not engaged with the catch

Question 16

What is the purpose of the overhead panel for the CDLS?

Answer 16

Manages fault indications, time delays and door access control of the CDLS

Pressure sensors operate if rapid decompression occurs in the flight compartment, which de-energises the solenoids

Question 17

How will a fault with one of the pressure sensors in the CDLS be indicated?

Answer 17

CHAN 1 or CHAN 2 LED comes on and the amber FAULT light comes on

Question 18

For how long is operation of the CDLS keypad locked out if the flight crew set the toggle switch to the LOCK position following an entry request?

Answer 18

Between 5 and 15 minutes

Question 19

What are the three proximity switches which monitor the passenger doors?

Answer 19

• Locking hook
• Locking shaft
• Escape slide

Question 20

What are the logic conditions for the cabin pressure red light to be illuminated and flashing on the passenger doors?

Answer 20

• One of the two engines, or both engines, are off
• Escape slide is disarmed
• Residual cabin pressure is greater than 2.5 millibars

Question 21

What are the two proximity switches which monitor the emergency exits?

Answer 21

• Cover flap
• Escape slide

Question 22

What are the three proximity switches which monitor the cargo doors?

Answer 22

• Locking handle
• Frame
• Latching shaft

Question 23

Which proximity switches of the cargo doors give the indication on the ECAM?

Answer 23

Locking handle and frame through the LGCIU 1

Question 24

What is the enable logic in the electrical control system of the cargo doors?

Answer 24

• Latching shaft proximity switch target is near (only available when the locking handle is fully open)
• Manual selector valve is operated

Question 25

What are the indications for the cabin crew on the FAP about passenger and emergency exits?

Answer 25

Red symbol - Door open/unlocked Green symbol - Door locked and slide armed Amber symbol - Door locked and slide disarmed