Gentlemen,
Next time, when you've nothing better to do.....
After landing, after arriving at the gate....without brake fans....brakes OFF (aircraft chocked)....note the brake temperatures....continue to note the
temperatures over a period of time....like for maybe an hour. Graph the temperatures vs. time. Maybe note the temps every five minutes for an hour period and graph the results.
I've done this.
As a result of my findings, I conclude:
1. Quick turns are not a good idea if you wish for a successful RTO.
2. Leave the XXX brake fans run. Don't turn them off if/when you leave the cockpit after the PARKING checklist is completed. Ask the mechanic to let them run for a bit before the next crew gets on board. (This adds new meaning to 'AS REQUIRED' on the Airbus PARKING checklist.)
A famous U.S. carrier (I don't need to name.) that boasts of quick turns rejected a takeoff several years ago due to bird ingestion and subsequent engine problems. The pilots performed the RTO flawlessly, but the aircraft ran off the end of the runway and into the grass.
Turns out, the brakes were hot.....maybe still within limits...but hot.
Doing one-hour segments....making that first turnoff after landing....quick turns....the brakes get hotter and hotter throughout the day. At some point, you become a test pilot if you need to do an RTO.
Over the years, I've discovered many little tidbits of information regarding aircraft performance vs. certification requirements...."stuff they don't want you to know" ....as the advertisements say...
In the case of the 150 degree limit on the SA Airbus brakes...this is one example. Yes, if you read the fine print, the accelerate-stop performance is guaranteed only if brake temps are no higher than 150 degrees. (Of course, there are other factors involved with this issue, as well.)
So, now, regarding the above-mentioned experiement. Cross reference your findings to this 150 degree figure.
Of course, the Airbus SOP states that, while taxiing out for takeoff, if the 'hat' is above one or more brake temps, you should run the fans during taxi out. (The hat pops up with a temp above 100 degrees.)
Fly safe,
PantLoad