Originally Posted by
FlightDetent
"new" sentence:
PRO-SUP-70-00009446.0001001 / 16 SEP 15 [Adjust thrust of supplying engine to obtain an engine bleed pressure of 30 PSI before start initiation, and of at least 25 PSI during the start sequence.]
previous wording:
PRO-SUP-70-00009446.0001001 / 09 DEC 09 [Adjust thrust of supplying engine to obtain 30 PSI at start air valve before start initiation and at least 25 PSI during start.]
PRO-SUP-70-00009446.0001001 / 16 MAR 15 [Adjust thrust of supplying engine to obtain 30 PSI at start air valve before start initiation and at least 25 PSI during start.]
pre-digital 3.4.70 SEQ 200 REV 42
I mean, I don't fly them (or any other transport category aircraft), but my interpretation is that they may have just dumbed it down. The question is; in a normal x-bleed start, presumably there wouldn't really be any other bleed consumers on... so the supply and demand side pressures, at least prior to initiating the start should be pretty close to the same, shouldn't they? If so, maybe they just dumbed it down a little - it may be sufficient to just look at supply side... Even if demand side is technically more correct.