Protections Flashcards
Load Factor protection values?
+2.5G to -1G CLEAN
+2G to 0G CONFIGURED
Pitch Attitude protections?
Config 0-3…… +30 to -15
Config full…….+25 to -15
In pitch when do FD bars disappear/reappear?
Disappear +25 or -13
Reappear +22 or -10
Describe AoA protection
Once speed reduces into Amber barber pole it goes beyond A PROT which changes flight control law to direct. Beyond this at some point A FLOOR activates which gives full power from engines. The pitch will not go beyond A MAX therefore providing max climb angle
If side stick released at A MAX what will happen to pitch?
Attitude returns to A PROT
When does AP disconnect in AoA protection?
A PROT + 1*
What does AoA give protection against?
Windshear and stalling
What is alpha floor and when does it activate?
Athr function that activates at certain point below alpha prot
It commands TOGA
Available from lift off to 100ft above landing
How do you recover from Alpha Floor?
Clicking the instinctive PBs on the thrust levers. Put the thrust levers in the climb gate and re-engage A/THR on the FCU
If you hold the instinctive PBs on the thrust levers for 15s what happens?
Disengage ATHR until the end of the flight. A FLOOR not available
Is alpha floor available in alternate law?
No
How does high speed protection work?
If full forward side stick is applied, the a/c will exceed Vmo/Mmo.
The a/c will neutralise the side stick and then command a nose up pitch until the speed reduces to normal
What happens to bank when high speed protection is active?
Max bank angle 40*
Bank returns to 0 if side-stick released
What is load alleviation function?
Automatic function when clean. Wing loads are unloaded by inverting the ailerons and deploying spoilers
Centring Beta target in SE conditions provides what?
Minimum drag and best climb performance
How does bank angle protection work?
Bank angle limited to 67, when above 33 and side stick released, bank returns to 33*
How is level flight maintained in bank up to max bank angle?
Up to 33* auto trim will maintain level flight. Above 33* back pressure on sidestick is required to maintain level flight
Is there any relationship between BA protection and the others?
If AoA protection active, max BA will not exceed 45*
If high speed protection active, will not exceed 40* and will return to 0 when sidestick released
What is the low energy warning?
Low energy warning below 2000ft in flaps 2, 3 or Full so pilot can take appropriate action before A FLOOR
When is low energy inhibited?
- below 100ft RA
- when TOGA is set
- during EGPWS
- Dual Rad Alt Fail
What is Alpha Lock?
Prevents slat retraction at high attitudes and low speeds.
Active below 148kts and AoA>8.5*
