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-   -   The A330 NWS angle limit 30deg ? (https://www.pprune.org/tech-log/642274-a330-nws-angle-limit-30deg.html)

alexsunny123 23rd Aug 2021 13:25

The A330 NWS angle limit 30deg ?

new to the bus was wondering if the airbus pros could tell me how do you restrict to 30deg on the tiller when you have two deflated tires. Meaning to say where is the 30deg mark.

tubby linton 23rd Aug 2021 17:26

When the 330 was fairly new Airbus imposed a maximum angle following the collapse of a leg of an A340. This was achieved by software in the BSCU. My employers used to have the crew monitor the angle through the maint system by using the code NWAM.

turbidus 23rd Aug 2021 23:12

The A330 is bank angle limited to 33 degrees under Normal law...that being said, it includes 5 degrees for course correction in said turn....

Up to 33 degrees normal. 34 to 67 degrees permitted but sidestick required to hold the angle of bank. Pitch input required to maintain altitude when above 33 degrees AOB

kids dont try this at home.....

Wodrick 23rd Aug 2021 23:23

RTFQ ........................

t211 24th Aug 2021 02:48

Wodrick at least finish the equation.I will help you

Qwark 24th Aug 2021 08:06

The A320 has markings on the tiller to provide awareness to NWS angle. I would assume the A330 is the same.

320busboy 24th Aug 2021 11:55


Think you misread. It’s NWS

The nws limit for deflated tyres is a bit arbitrary. Best guess. If over don’t worry too much. It will only damage the rims more. They are already chooched anyway. Wouldn’t put too much thought into it.
think there is a few lines on the tiller base. Could be one of them.

Tom Sawyer 27th Aug 2021 03:11

Yes, on the tiller base plate are graduated markings. Think the first graduation marking is 30 deg, but haven't got access to a 330 at the moment to have a look for you, and pics on the 'net and in my course notes are not very clear.

As an Engineer having been involved in this situation, we went out on to the runway and changed the wheels before towing the aircraft. Moving the aircraft with 2 deflated tyres puts a lot of stresses through the bogie and oleo leg, as well as the potential for damaging the runway surface. Not sure what the FCOM/Ops Manual wording actually says, but would think moving the aircraft like this would be a last resort situation. For the sake of 40-60 minutes, can save the operator and the airport a lot of grief.

the_stranger 27th Aug 2021 10:01

While I'd like to assume the first marking is 30 degrees, it isnt mentioned in my FCOM.

Also there are 4 markings on each side, suggesting a max of 120 degrees, which is more than the actual max of 72.
And, as far as I remember, when making a 180 turn during a backtrack, I do use full tiller, but can't remember if that is actually at that last marking.

TURIN 27th Aug 2021 10:27

It would take twice as long to get permission to approach the aircraft, then you need escorting on to the runway after locating the 'Rhino' unit that's been sat idle at the back of a hangar since the last time it was used.

itsnotthatbloodyhard 1st Sep 2021 11:23

The graduations on ours are for 10 degree increments, so 3 out from the centre should do the trick.

the_stranger 1st Sep 2021 17:38

On the A330 there are 4, with the 4th just a tad away from the 3rd.

That way I would assume it's 20/40/60/72, but again not mentioned in the FCOM.

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