In the caption of this picture the author quotes that the brake is overheat. Is this a frequent issue or did the pilot do something during the landing roll that caused this?
Any insight to this is more than welcome.
Sevenair From United Kingdom, joined Feb 2001, 1728 posts, RR: 0 Reply 1, posted (2 years 6 months 1 week 6 days 14 hours ago) and read 2856 times:
Perhaps it was a hot day. Coupled with heavy breaking, could easily lead to break temperature becoming excessively hot. And as their job is to absorb heat, thus slowing the a/c, so it will ask him to delay t/o as the breaks may not slow the aircraft sufficiently during an aborted t/o.
Scarebus03 From Ireland, joined Apr 2005, 165 posts, RR: 1 Reply 2, posted (2 years 6 months 1 week 6 days 14 hours ago) and read 2812 times:
It is only a "brakes hot" warning after landing. It is there to remind the pilots that they have to allow the brakes to cool before the next takeoff. If it is an Airbus with brake fans they switch them on and the brakes cool to the green range. This aircraft has brake fans and the warning (amber) is on the brake fan switch, so just push the button and in 5 mins everything o.k. on aircraft without brake fans you have to wait longer, until the "delay t.o. for cool" message disappears from the ECAM.
If it is an overheat you will get the applicable warning on the ECAM.
320tech From Turks And Caicos Islands, joined May 2004, 462 posts, RR: 4 Reply 4, posted (2 years 6 months 1 week 5 days 22 hours ago) and read 2347 times:
The fans are mounted over the outer part of the wheel. They have to be removed first before a tire change, making them a pain in the butt for techs. They look like big louvred hubcaps on the outside of the wheels.
The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
Musapapaya From United Kingdom (England), joined Apr 2004, 660 posts, RR: 0 Reply 7, posted (2 years 6 months 1 week 5 days 18 hours ago) and read 2276 times:
Can anyone suggest how much time is required to cool down the brakes? 4U has very short turnaround time so is it not desirable for the pilot to overheat the brakes? Or is cooling down required all the time after a landing?
Scarebus03 From Ireland, joined Apr 2005, 165 posts, RR: 1 Reply 8, posted (2 years 6 months 1 week 5 days 16 hours ago) and read 2241 times:
Normally the brake fans are always switched on after landing or when on stand. They are very effective and normally within 8-12 minutes during normal operation i.e. no rejected takeoff, emergency landing etc. The aircraft is good to go. Without brake fans cooling obviously takes longer. Here in BCN last year we had this problem until we modified all the A/C and fitted the brake fans. The aircraft in the pic has brake fans so no pasa nada!
SlamClick From United States, joined Nov 2003, 9994 posts, RR: 72 Reply 9, posted (2 years 6 months 1 week 5 days 15 hours ago) and read 2215 times:
A brake going over 300°C is a very common occurrence on the A-320 series, and no big deal unless it goes quite a bit hotter.
Yes, brake fans are optional.
Quoting Scarebus03 (Reply 8): Normally the brake fans are always switched on after landing or when on stand.
Not where I flew them. In fact we were finally instructed not to turn them on at all unless they went above a certain higher temperature because flash cooling was doing more damage than slight overtemping.
When you turn them on after a moderately braked landing they would blow carbon dust all over the place. Ground staff did not like us doing that without warning, and rightly so. My technique was to turn them ON for about ten seconds or so then OFF while approaching the gate. That would blow the dust out in case we got the overtemp after sitting at the gate.
FlyMatt2Bermud From United States, joined Jan 2006, 522 posts, RR: 5 Reply 10, posted (2 years 6 months 1 week 5 days 13 hours ago) and read 2174 times:
Quoting Musapapaya (Reply 7): Can anyone suggest how much time is required to cool down the brakes? 4U has very short turnaround time so is it not desirable for the pilot to overheat the brakes? Or is cooling down required all the time after a landing?
Time required to cool dimish brake heat varies with ambient temp, the energy that was required to heat the brakes, a breeze may help. The temp sensors must be checked prior to takeoff. Some higher than normal temps are permitted provided the runway is sufficient in length and you must get this info from either the charts or the computer performance programs. Generally after a typical landing we need 20 minutes for the brake units to cool. Some aircraft without temp sensors have time constraints that must be observed.
One factor on brake energy is more heat may be generated during taxi if the pilot rides or uses the brakes frequently. This is why many aircraft use thrust reverser(s) during taxi as a speed control device.
"I just want you to know, we're all counting on you!"
Scarebus03 From Ireland, joined Apr 2005, 165 posts, RR: 1 Reply 11, posted (2 years 6 months 1 week 5 days 13 hours ago) and read 2170 times:
This is true about the dust, however our crews switch on the brake fans before coming on stand that way all the dust has been blown out beforehand and they are left on as required. In BCN during summer you need brake fans also for the long taxi to stand. I remember the flash cooling problem a few years ago but in recent years I have seen nothing. Maybe the type of brake used was a factor. We often had problems with disintegration of the brake rotors on A321's but I have never seen this on the A320, again this was quiet a few years ago.
Musapapaya From United Kingdom (England), joined Apr 2004, 660 posts, RR: 0 Reply 16, posted (2 years 6 months 1 week 4 days 19 hours ago) and read 1859 times:
If they were quiet, I would take it to mean they weren't doing much in the way of cooling, so my guess is the large volume of air they are trying to move to justify the installation results in this loudness.
I myself always found the DC-10 with a running APU the most irritating and obnoxious "sound-wise" of all the aircraft, but I have a feeling an Airbus with these fans would beat that out...
Bri2k1 From United States, joined Dec 2004, 784 posts, RR: 2 Reply 20, posted (2 years 6 months 1 week 4 days 10 hours ago) and read 1696 times:
Quoting N8076U (Reply 19):
I myself always found the DC-10 with a running APU the most irritating and obnoxious "sound-wise"
Maybe you never had the good fortune to witness a CRJ-200 APU when it makes the Shriek of Death. My God. And, much of the time with a CRJ, (such as in YWG in the middle of winter), jetbridge service is not available and the poor, unprepared pax must walk outside while it's running. For those of you who haven't heard it, it's intermittent, maybe only a second or two in duration, and happens once a minute or so. I've never asked what it is because I frankly don't care. It just seems to me that even French Canadians could have thought of a better way to design whatever the hell it is that makes that godawful noise.
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