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BOEING 747 FLIGHT COMPUTER
ENGINE  RATING  PRESSURE  RATION  COMPUTER
» JT9D-3A/B747 «
(  8" / 21 cm   Diameter  )



... FRONT SIDE shown on the Patent Papers #3,635,398
and a close-up of the BACK SIDE ...



» JT9D-3A/B747 «   ENGINE RATING PRESSURE RATION COMPUTER   » D-3A «
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PRATT & WHITNEY AIRCRAFT FLIGHT OPERATIONS ENGINEERING, USA   (1970)

This SR was invented by Anselmo Toni, Wapping, Connecticut / USA  in
1970.  Its purpose  is  to determine  turbine engine  pressure ratio
limits during engine operation for several inflight ratings.  It was
used in the first "JumboJet" BOEING 747-100 with the Pratt & Whitney
JT9D high-power turbines.
                                                          impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann     11/12/12