On a 767 with Brake Temp indicators and carbon brakes, the temperature warning showed shortly after T/O (up to 6 IIRC). It cooled during the short flight, but was obviously going to cause problems at the other end, so necessary precautions were taken. After landing the temperature increased to max (9) but gradually cooled. When it got down to 3 and was approaching the “normal” range, the engineer and I went to stand down the fire cover. We were discussing the options and the engineer leant over to feel the wheel – but before his hand got there, the fusible plug blew and we both nearly shot through the wing tank with shock.
There was no expectation of another T/O until our problem (a sticky brake) had been solved, but what it did show was that a plug can blow even when the temperature is back in the acceptable range. (Are we ready for another try?
) Now, back to topic…