Brake AccumulatorHome > Tech Photos > Walkaround > Accumulator | ||
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The accumulator uses its stored air pressure to give emergency brake pressure in the event of loss of hydraulic system A and B pressure. It can provide six full brake applications - even if all hydraulic power is lost. If you should get into that situation just apply the brakes and hold them on, don’t cycle or pump the brakes because you only get six applications. The accumulators also dampen pressure surges and assure instantaneous flow of fluid to the brakes regardless of other hydraulic demands. A fully charged accumulator will also keep the parking brake pressurized for eight hours. On the -1/200 there are two brake accumulators, one for inboard brakes & one for outboard brakes. All later series had just one accumulator. See also brakes |
All of the information, photographs & schematics from this website and much more is now available in a 374 page printed book or in electronic format. *** Updated 05 Aug 2023 *** |
The accumulator has a volume of 300 cubic inches (4.9 liters). On the Classics it is located on the rear wall of the wheel well on the stbd side. On the NG and MAX. It is located behind an access door in the right aft wing-to-body fairing just behind the wheel-well. Accumulator servicing point - 737 The pressure gauge measures air from the air side of the accumulator and should read approximately 3000psi. Accumulator servicing point - 737NG/MAX |