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B737 (NG) PTU

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B737 (NG) PTU

Old 14th Jun 2006, 14:09
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B737 (NG) PTU

Can somebody please remind me of the principle of operation and purpose of the Power Transfer Unit on the B 737 NG ?

Thanks for any help.
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Old 14th Jun 2006, 14:55
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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.
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