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Illustrated technical information covering Vol 2 Over 800 multi-choice systems questions Close up photos of internal and external components Illustrated history and description of all variants of 737 Databases and reports of all the major 737 accidents & incidents History and Development of the Boeing 737 - MAX General flightdeck views of each generation of 737's Technical presentations of 737 systems by Chris Brady Detailed tech specs of every series of 737 A collection of my favourite photographs that I have taken of or from the 737 Press reports of orders and deliveries Details about 737 production methods A compilation of links to other sites with useful 737 content Study notes and technical information A compilation of links to major 737 news stories with a downloadable archive A quick concise overview of the pages on this site


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, donít 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

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*** Updated 14 Nov 2021 ***

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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

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