A380 performance Flashcards
What is standard required go-around performance climb gradient?
2.5%
Ref??
Doesn’t the LDPA for the A380 indicate something about 2.7% ??
What is the standard SID required climb gradient?
3.3%
Ref ??
What is Landing Climb?
What is the Landing Climb Gradient for the A380? (ie what is the climb gradient does the A380 (being a quad jet) need to be able to achieve for a go-around, all engines operating, gear down and flaps/slats full, to be certified for public transport?)
What is Landing Climb? It is gear down, slats and flaps in the landing configuration, ie CONF full for the A380, all engines operative.
3.2% (the Landing Climb Gradient for a quad jet, required for certification for passenger operations ie this is what the airplane must be able to achieve at /MLW?? Or MTOW??)
Ref??
Ref?
What is ‘Approach Climb’?
Approach climb gradient ? (ie what is the climb gradient that the A380 (being a quad jet) needs to be able to achieve for a go-around, one engine inoperative gear up and flaps/slats CONF 3, to be certified for public transport?)
What is Approach Climb? It is one engine inoperative. TOGA thrust. Gear up. In the correct flap configuration for a go-around, ie CONF 3 for an A380.
2.7% (The approach climb gradient for a quad jet, required for certification for passenger operations, ie this is what the airplane must be able to achieve at /MLW?? Or MTOW??)).
??
FPF for floating spoilers?
10%
What is more limiting in the A380: Approach Climb or Landing Climb?
Approach Climb is always more limiting in the A380.
Ref??
When you have a missed approach procedure that involves a turn (not sure if it needs to be by 1 deg.. or perhaps a turn is considered 15 deg or more??), what is the climb performance gradient penalty due to the turn?
Therefore how to you ensure that you have the climb gradient performance to achieve the missed approach required climb gradient?
When there is a turn in the missed approach you should assume that you will lose 0.6% of your climb gradient performance.
If the MISAP required an 7.0% climb gradient, with a turn (like in HKG 07L) then you would need to ensure that you can achieve at least 7.6%.
It’s possible to put this figure (ie required MISAP climb gradient + 0.6%) into the LDPA.
Segmental climb gradients? (A380 quad jet)
Which segment has the highest climb gradient?
Takeoff segments and climb gradients for an A380 (quad jet):
Minimum climb gradient on N-1 engines (ie one engine fails at V1)
First segment: 0.5%. (But 1.7% climb gradient must be ‘available’ - whatever that means?).
Second segment: 3.0%
Third segment: - - - Note: We fly level because we have pushed ALT to level off and accelerate/retract flaps, but for certification purposes an A380 (quad jet) the ‘available’ climb gradient must be a least 1.7% (I take this to mean that it must be cable of 1.7%).
Fourth segment: 1.7%
What is the ‘takeoff path’ defined as?
Where does the takeoff FLIGHT path begin?
The takeoff path is defined as a path from a standing start to the point at which the aircraft attains a height:
- Of 1,500’above the takeoff surface, or
- At which the transition from the takeoff path to the en-route configuration is completed and the final takeoff speed is reached,
… whichever is higher.
The takeoff FLIGHT path (as opposed to the takeoff path) begins ta a height 35’ above the takeoff surface at the end of the takeoff distance.
What are the four takeoff segments?
First segment: From liftoff at 35’ until the gear is retracted, with TOGA. Not below V2.
Second segment: From gear retraction until the acceleration altitude (which is regulatory required be at least 400’). Note: Acceleration altitude at EK is minimum 1000’ agl and that’s only once we have secured a malfunctioning engine and we push ALT to accelerate and retract flaps. With TOGA. Not below V2.
Third segment: From level off for acceleration until the slats/flaps are retracted. Speed accelerates from V2, or V2+10 etc (whatever SRS commands) to Green Dot speed. With TOGA. (10 mins max with TOGA with one engine out!)
Fourth segment: From the completion of acceleration to green dot and then climb to 1500’ at MCT.
Third segment: This we
What is the difference between GROSS Flight Path and NET Flight Path?
What is the general point of this?
The gross flight path is the the takeoff flight path actually flown by the aircraft.
What is the definition of ‘Thrust-Limited Maximum Altitude’?
What is the practical implication of TLMA?
Thrust-limited maximum altitude is the maximum altitude at which there is sufficient thrust to provide a ROC of 300 fpm.
Ref??
I believe that thrust-limited maximum altitude is the same as REC MAX altitude!!
Ref: FCOM/Performance/In-Flight/Climb/Climb Results
REC MAX Altitude has the following criteria:
- Speed between GD and VMO
- A minimum ROC of 300’ is achievable with maximum climb thrust
- It can be flown in level flight without acceleration with less than maximum cruise thrust. In other words, it retains some excess performance capability, ie we could accelerate a bit if required.
- It can be reached before buffeting with a margin of 0.3g
- It is below maximum certified altitude.
The practical implication of this is that climb capability should be recognised as acceleration capability when level at TOC. If the airplane has the capability to climb at 300 fpm then it has the capability to level off and accelerate at 1kt per second. For example if you can only climb at 100 fpm then when you level off you will not be able to accelerate sufficiently which could put you in a precarious speed situation with turbulence that could induce airplane upsets etc.
Ref: 2020 Phase 1 Manual Handling Presentation.
