PPRuNe Forums - View Single Post - Rote use of autobrakes when operationally unnecessary
Old 21st Jul 2009, 19:42
  #32 (permalink)  
safetypee
 
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JT Re # 26 “… the FT community likes to dangle the wheels for a while after takeoff to cool the units off following any significant braking effort on test. Indeed, after RTO work, the usual procedure is to turn around and takeoff immediately solely for the purpose of flying around …

Generally true for high brake useage, except for RTOs, which tend to have greater energy levels than landing (TO wt above max landing wt).
However, considering that although the initial brake temps were low, the landing energy in stopping has gone somewhere, but not through the brake fans that quickly. Thus the debate is that although the energy was in the brake heat pack, because it did not indicate on the temp gauges then the tyres were not in danger of heat soak. Thus in-flight cooling helped cool both the brake pack and tyres. (I’m not entirely convinced, but it worked).
For RTOs the higher energy levels did not permit the choice, often as did the presence of the fire truck!

Don’t try this at home – and don’t forget to look after the tyres.
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