I have answered this question somewhere amongst my FAQ. After take off, you would hear the engines power being reduced at between 1000 to 1500 feet above ground level. This is usually to comply with noise abatement procedures of some particular airports located around populated city area. Noise abatement is a procedure whereby the engine thrust is reduced from the usual take off power, which is fairly noisy in some airplanes, to a setting that is lower and less noisy.
I am sure you are aware that many people who live along the take-off flight path are getting very sensitive over the noise of jet planes taking off at various times of the day. Pilots and Airlines can be fined for not adhering to this requirement.
Once an airplane has reached its acceleration altitude of 3000 feet, the climb power would be maintained until the cruising phase of the flight. At this point, the power is further reduced to an economical cruising power of about 10 percent of the take off power, to achieve a speed of Mach 0.84 or around 550 mph on the Boeing 777.
So the engines are never at full power in cruise, except during the take off at the designed maximum take-off weight.
你们在机场take off 后，当爬升到一定的安全高度时
都会跟据规则把引擎减速（？）以减少噪音对吗？
一般在cruise 时都不会开足马力？
how abt landing ? 会max ?
另外想要问关于domestic and regional的问题,我一直的观念是
regional<domestic<international route.(主要原因是机种的range)
regional jet(1000 -2000) nautical miles
domestic (2000-5000)
international (可以去到9000)
可是上一天我看到这个就有点乱 http://www.fireflyz.com.my/flights/destinations
firefly为什么把batam,medan这些印尼的route当作他们的regional route?
请问到底怎么区分regional and domestic route?
遨翔 发表于 24-4-2011 10:17 AM
Domestic ＝ 国内
Regional ＝ 区域
KLIA 飞去 Kota Kinabalu 那么远还是叫国内航线，因为 Sabah 还是马来西亚。
KLIA / Subang 飞去 Medan、Batam 那么近但是叫区域航线，因为那边不是马来西亚。但是，还是属于 south east Asia country。
I have answered this question somewhere amongst my FAQ. After take off, you would hear the engines power being reduced at between 1000 to 1500 feet above ground level. This is usually to comply with noise abatement procedures of some particular airports located around populated city area. Noise abatement is a procedure whereby the engine thrust is reduced from the usual take off power, which is fairly noisy in some airplanes, to a setting that is lower and less noisy.
I am sure you are aware that many people who live along the take-off flight path are getting very sensitive over the noise of jet planes taking off at various times of the day. Pilots and Airlines can be fined for not adhering to this requirement.
Once an airplane has reached its acceleration altitude of 3000 feet, the climb power would be maintained until the cruising phase of the flight. At this point, the power is further reduced to an economical cruising power of about 10 percent of the take off power, to achieve a speed of Mach 0.84 or around 550 mph on the Boeing 777.
So the engines are never at full power in cruise, except during the take off at the designed maximum take-off weight.
你们在机场take off 后，当爬升到一定的安全高度时
都会跟据规则把引擎减速（？）以减少噪音对吗？
一般在cruise 时都不会开足马力？
how abt landing ? 会max ?
旧的 procedure 是 NAP A NAP B。一些机场还是用旧的 NAP。
老何 发表于 17-1-2011 12:33 PM
2. 架飞机和架汽车有异曲同工的原理。飞机的 Max thrust 和汽车踩尽油门是一样的。假设汽车要 cruise 110km/h，当你从0 km/h 加速到 110km/h 后，你自然就不会继续踩尽油门。
3. 飞机landing 的 touch down point 就好像汽车 parking 的格子。只不过这个格子非常的长。在远远的时候，你看见了格子，但是你的车brake 不是很好不能马上停下来(飞机在天空飞行的时候的是没办法马上停下来)，你会 idle 让车你自己慢下来 (飞机 idle power 慢下来)。但是还没进 parking 格子之前你还是要踩一点点油门让汽车继续前进( 飞机需要 base power 继续 approach)。试问，当你进了 parking 格子后，你还会进档踩油门吗？
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发表于 12-4-2011 09:22 PM
你的答案没错。
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