15 Questions
Free Fall Control Module (FFCM) Channel A is powered by?
28 VDC Bus 1
Free Fall Control Module (FFCM) Channel B is powered by?
DC Essential Bus
Ground Door Opening System (GDO) interfaces with what FFCM Channel?
Channel B
How many Cut-Out Valves and Vent Valves involve in Free Fall?
3 cut-out valves, one for each landing gear group, Five vent valves, one for each landing gear
Free Fall is a what type of system?
Timer system
1st Step in 6 steps Free Fall
From 0 to 7 sec., the cut-out valve actuators are energized to isolate the hydraulic supply from each Landing Gear hydraulic circuit.
2nd Step in 6 steps Free Fall
From 7 to 14 sec., the Vent Valve actuators are energized. This causes the Vent Valve for each Landing Gear bay to open and there is free flow between the extend/retract ports of the Gear Actuator and the open/close ports of the Door Actuators. This will let the gears and doors fall by gravity when they are released.
3rd Step in 6 steps Free Fall
From 14 to23.5 sec., the Emergency Unlock Actuators are energized to open the NLG and WLG Door Uplocks and these Doors can free fall
4th Step in 6 steps Free Fall
From 23.5 to 44 sec., the Emergency Unlock Actuators of NLG and WLG Gear Uplocks are energized, and these Gears can free fall.
5th Step in 6 steps Free Fall
From 44 to 53.5 sec., the BLG Inner/Outer Door Emergency Unlock Actuators are energized to open the BLG Doors.
Last Step in 6 steps Free Fall
From 53.5 to 63.5 sec., BLG Gear Emergency Unlock Actuators are energized to release the BLG.
What position of Landing Gear if the independent L/G indication panel has no light?
L/G Up and Locked
What position of Landing Gear if the independent L/G indication panel is RED UnlocKeD?
L/G neither locked up nor locked down, which means discrepancy between L/G lever position and the related L/G status,
When all the Landing Gears are downlocked, the status of the L/G is also displayed on what part of PFD?
Left - Lower
This position of Door Bypass Valve Actuator allows restricted flow of fluid and the door slowly close.
Intermediate
Test your knowledge of the Free Fall Control Module (FFCM) with this quiz. Questions cover power sources for channels A and B, interfaces with Ground Door Opening System, number of Cut-Out Valves and Vent Valves involved in Free Fall, type of system, and the first step in the 6-step Free Fall process.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
