"Scet" wrote in message
...
Hi Dudley,
My train of thought was that EGT should be relatively stable the
moment
flaps to land was selected. If EGT was say 530 degrees and flaps were
selected to land, the valve linked to the flap system would open,
removing
air from the compressor/diffuser. A portion of this air is also used
to cool
the turbine, so removing it should cause an EGT rise. Is it this rise
in EGT
that is looked for to ensure the system is operative?

Makes sense, but I'll be surprised if Walt or Ed verify that looking for
an EGT rise on final in a 104 would be the indication for BLC operation.
It's more likely a bulb indicator if anything I would imagine, but I
could be wrong. I'm guessing you get blown flaps over 15 degrees as an
automatic function of the direct linkage to the flap system. I do know
this however. The zip guys have told me they knew pretty fast if it was
working if they at any time powered back below 80% :-))
Hope Walt and Ed take this up for you.

Take care,
D