B737 (NG) PTU
Per Ardua ad Astraeus
Join Date: Mar 2000
Location: UK
Posts: 18,579
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The Classic as well - if B system engine driven pump/number 2 engine fails, the PTU uses A system pressure to power a pump which pressurises B system fluid for flap/slat opertaion. Flaps extended but less than 15 and airborne only.