hello everyone,

 

is it true that companies prohibit there pilots to desengage autopilots during landing? 

 

in ILS approach -FAIL Passive the landing is performing with dual autopilots until DH , the first autopilot is disengaged and the second while the touchdown.

 

i'm confused .

 

regards

The short answer is 99% of 737 landings will be fully manual, ie no autopilot or autothrottle.

 

The 737 (well, certainly the newer ones) are capable of full autolands, where both autopilots will remain engaged all the way to touchdown but this might happen only a couple of times a year depending on where in the world you're flying.

 

The autoland system also has to be tested periodically so crews will occasionally perform an autoland even in good weather. It's worth noting that the criteria for an autoland is pretty specific - not only must the aircraft be capable of it, the crew must also be certified and the ILS a CATII or above and 'protected' ie the antenna that broadcasts the signal must not be blocked or affected by taxying aircraft, which is why you see different holding points during CATII operations.

 

Performing an autoland outside these criteria can end up badly. Google Singapore Airlines 777 at Munich for details!

if the criteria of an autoland  are fulfilled, and the landing is performed with one engine inoperative. Is it possible to do an autoland?

 

-FAIL PASSIVE -

On the 73 I'm not sure. On the 777 yes. I'll ask one of our guys. I'd be surprised if the NG couldn't do it.

okay , thank you.

For further info, the 777 can indeed do an autoland with 1 or 2 engines, flaps 20 or 30. Although flaps 25 is a landing flap setting, you can't do an autoland withflaps 25. Unless in an emergency, it is also not certified to do autolands when overweight.

The 737 cannot do an autoland on one engine....also, it is not possible to use the autothrottle when flying on one engine...