View Full Version : A340 brake cooling

Philip Mew
25th Feb 2002, 06:31
Is there a brake cooling chart for the A340 ?. .Or is it not necessary : takeoff is OK as long as brake temps are in the green ( below 300 degrees Celsius )on the Wheels System Display Page ?

25th Feb 2002, 15:13
Would the amount of time it takes to turn around an A340 be long enough to ensure there is no problem? However, I'm sure something must be down in writing to cover the RTO situation, for example.

regards. .wizzy

26th Feb 2002, 01:40
Some operators also have the brake cooling fans fitted. A quick look at the course notes quotes "max wheel brake temp for take-off 300degC"

26th Feb 2002, 09:18
That is exactly right, the ECAM will come up with a warning "Brakes Hot delay take off" if the brake temp is more than 300 degrees. We have brake fans on ours and this usually will take care of them within a normal turn around. Another trick engineers do is that they call an a/c unit and blow cool air on the brakes in high outside temp conditions, don't know however if this thermal shock is actually too good for the brakes.. .Cheers

1st Mar 2002, 00:35
The A330 brake temperatures must be similar to the A340, and are given (light-heartedly) at:. .<a href="http://www.geocities.com/profemery/aviation/braketemp.html" target="_blank">http://www.geocities.com/profemery/aviation/braketemp.html</a>

1st Mar 2002, 02:45
This would be a 950 then I guess.

<a href="http://www.aviationpics.de/test/test.htm" target="_blank">aviationpics test</a>


[ 28 February 2002: Message edited by: lamer ]</p>

1st Mar 2002, 19:43
Blowing cool, conditioned air over hot brakes does them no harm at all, carbon or steel. The only caution is to avoid breathing the dust and mess the blower kicks up when you turn on the delivery hose . . . I have seen our Russian friends here use a potable water truck on their IL 62's when the brakes get too hot. Now, don't think I would like to get involved with that little game !

Lu Zuckerman
1st Mar 2002, 23:24
The first picture in the series that indicates a test gone wrong is incorrect. The picture is the first in a series of the test on the A-340-600 for rejected take off. The fire was expected and although fire trucks were on hand they could not take action for five minutes in order to determine that the fire would not propagate to the fuselage and wing. The entire series can be seen at:

<a href="http://www.iasa.com.au/A340-600RTO/" target="_blank">www.iasa.com.au/A340-600RTO/</a>

[ 01 March 2002: Message edited by: Lu Zuckerman ]

[ 01 March 2002: Message edited by: Lu Zuckerman ]</p>

Flight Safety
2nd Mar 2002, 10:13
The entire series can also be seen here, with thumbnail photos.

<a href="http://www.aviationpics.de/test/a346/page_01.htm" target="_blank">http://www.aviationpics.de/test/a346/page_01.htm</a>

Clearly more design work needs to be done with the A340-600 brakes. That much damage should not have occurred.

3rd Mar 2002, 21:16
more and better info:. .. . <a href="http://www.pprune.org/ubb/NonCGI/ultimatebb.php?ubb=get_topic;f=1;t=017985" target="_blank">a340-600 brake test info</a> . .. .regards

Philip Mew
7th Mar 2002, 02:05
So , going back to my original posting , is there a brake cooling chart for the A340 ? !

8th Mar 2002, 17:54
Howdy again Wyleem,. .. .Yes there is a chart which is located in the MEL.. .ref MEL 02-32 p3 (32-47).. .. .From FCOM 2.02.20 p17. ."The FCOM 3.02.32 Hot Brake Procedure gives a temperature of 300 deg C as a maximum prior to take-off. This limit is designed to prevent possible ignition of hydraulic fluid in the wheel bay in the event of a hydraulic leak after gear retraction.. .. .The MEL charts were designed to cater for the case of Loss of Brake Temperature Indication. However, they are equally valid for assessing cooling time following a RTO or Landing.". .. .Hope this answers your question.. .. .Samuri