mpvincent From New Zealand, joined May 2011, 7 posts, RR: 0 Posted (1 year 3 months 1 day 18 hours ago) and read 4374 times:
Hi there,
Can someone tell me whether the 200ER can have higher take-off flap settings than 20? Also, can the 300ER have higher landing flap settings than 30? If so, do airlines use settings like this much?
Qantas744ER From United States of America, joined Jun 2005, 1252 posts, RR: 4 Reply 2, posted (1 year 3 months 1 day 17 hours ago) and read 4355 times:
Here is the breakup:
Takeoff Flaps:
777-200: 5, 15, 20 (Flaps 5 is the most commonly used setting)
777-200ER: 5, 15, 20 (Flaps 5 is the most commonly used setting)
777-300: 5, 15, 20 (Flaps 15 is the most commonly used setting)
777-300ER: 5, 15, 20 (Flaps 15 is the most commonly used setting)
777-200LR: 5, 15, 20 (Flaps 15 is the most commonly used setting)
777-200LRF: 5, 15, 20 (Flaps 15 is the most commonly used setting)
The takeoff flaps setting depends on various factors, such as TOW, OAT, runway length etc. etc.
For the 777-200 and -200ER Flaps 5 will normally get you out of 99% of major airports runways at MTOW and under normal conditions. However when runway available is limited, flaps 15 or flaps 20 may be the result the computer/ACARS gives to the crew.
Considering the 300 is significantly longer and also heavier than the -200, flaps 15 will result in better tail clearance on takeoff and will allow for takeoffs at MTOW under most conditions. However flaps 20 may sometimes be required and flaps 5 may indeed sometimes be what the numbers suggest if the plane is going out empty on a test flight for example.
The -300ER, -200LR and -200LRF all have significantly higher MTOW's and for the -300ER especially Flaps 15 is SOP for many operators. Air France for example does not allow Flaps 5 operations on the -300ER.
99% of the time the numbers will suggest a Flaps 15 takeoff for the -300ER, that is not to say that under certain circumstances when obstacles may be a factor, that flaps 5 cannot be used. Air Canada for example does plenty of Flaps 5 takeoffs on the -300ER.
The -200LR and -200LRF can be very heavy and thus flaps 15 again just happens to be what the performance numbers will recommend to get the highest RTOW, using the least thrust.
Flaps 20 is of course also available but only required on very short runways.
In the end it all depends on the operators SOP and the numbers that the takeoff performance computer/EFB/ACARS give to the crew.
To sum it up: Flaps 5, 15, and 20 are all available across the entire 777 and the actual and most common settings simply depend on many different conditions, some of which i have mentioned above.
For Landing:
All 777s have Flaps 25, and 30 available as a normal landing configuration. 99% of operators use flaps 30 under 99% of circumstances. However I know that BA has been using Flaps 25 as their SOP for the 777-200ER since a very long time. Slightly higher landing speed but less drag and noise! (perfect for heathrow). They also do this on the 744, but I am not sure if it is also sop on their -300ERs. Of course when performance requires it they will use flaps 30.
Flaps 20 landings are used across the whole 777 family in an engine out condition.
LU9092 From United States of America, joined Oct 2007, 65 posts, RR: 1 Reply 5, posted (1 year 2 months 3 weeks 3 days 20 hours ago) and read 3394 times:
Quoting tdscanuck (Reply 3): All 777's have the same flap positions: UP, 1, 5, 15, 20, 25, and 30.
Would Flaps 1 (leading edge devices only?) be used at any time other than climb or descent? Is that setting typically used for any significant duration, or only when in transition from UP to another setting on descent/approach or from Flaps 5 to UP during climb? I'm also curious if there is any setting never used in operation, but instead used during maintenance.
OldAeroGuy From United States of America, joined Dec 2004, 3206 posts, RR: 66 Reply 7, posted (1 year 2 months 3 weeks 3 days 2 hours ago) and read 3193 times:
Quoting tdscanuck (Reply 6): Quoting LU9092 (Reply 5):
Would Flaps 1 (leading edge devices only?) be used at any time other than climb or descent?
I'm reluctant to say "never" but I've never seen it used for anything else.
The 777 AFM placards 777 high lift system deployment to altitudes below FL200. Therefore Flaps 1 wouldn't be available at cruise altitudes. Flaps 1 is used as a Takeoff and Landing transition flap and may be used for Holding.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
LU9092 From United States of America, joined Oct 2007, 65 posts, RR: 1 Reply 8, posted (1 year 2 months 3 weeks 2 days 22 hours ago) and read 3133 times:
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