737NG液压油箱增压系统简介

液压油箱增压系统简介以及压力指示表问题...

AMM TASK 29-09-00-860-803

Hydraulic Reservoir Pressurization System - Leakage Test：

Make sure the pressure difference between the reservoir air pressure gauge and the bleed air pressure gauge is not more than 10 psi.

NOTE：

A pressure difference greater than 10 psi may be an indication of an air leak in the reservoir pressurization system. Normal reservoir pressure should be45-50 psi,however, the approximate operating range canl vary between12-65 psi depending onpneumatic source available and aircraft operation.

NOTE: Boeing would like to inform operators that if a hydraulic reservoir pressurization gauge has been found failed or leaking, the aircraft can fly with a blank installed in place of the reservoir pressurization gauge per MMEL 29-16 for up to 10 calendar days.

CONDITION

Boeing has had several reports of hydraulic fumes in the cabin due to overservicing of hydraulic reservoirs. Hydraulic fluid travels backwards past a check valve(s) in the reservoir air pressurization system and enters the air conditioning ducts

RECOMMENDED ACTION

Under no circumstances should the hydraulic reservoirs be filled past FULL (100% indicated).

To provide a margin of safety, operators may, if they choose, fill thereservoirs to approximately two-thirds between refill (RF) and FULL,which is roughly 92%. This will have no effect on system operation,and will ensure that the reservoirs are not overserviced. AMM 12-12-00 was recently revised (Feb 2012) to clarify the wording on this subject.

Operators should also make sure that the airplane configuration requirements of AMM 12-12-00 Paragraph 2.F (high lift devices retracted and brake accumulator charged) are followed when servicing the reservoirs.气滤和单向活门

引气首先经过汽滤和单向活门，气滤在空调分配舱（要开盖板），吹散热器或更换散热器能看到

目前有两种气滤：

150微米滤芯，带单向活门，件号是1732030-01；

200微米滤芯，带单向活门，件号是7595270-103开孔堵头，件号：69-35981-1

清除系统中的水份潮气和污染物。正常情况：开引气，此处排气；关闭引气，此处没有排气。四通组件，件号：9R3886

再经过单向活门给油箱增压，限流器防止下游管路漏气导致飞机气源系统失压释压活门，件号：65C26841-45

油箱空气压力增加到60-65 psi时打开，释放压力到主轮舱后机身下部的排放口，当压力降低到其释压压力90%时关闭（最小在55PSI）管路组件，件号：271A3444-9

管路组件上连接了一个充气活门，当增压气源失效时，可以通过外接气源充气给液压油箱增压。

做维护工作时，通过此活门给油箱释压。如果表头卡在0位指示不动，也可以通过此处放气，看是气源问题还是指示问题空气压力表，件号：90-900-1032/G3721

以PSI为单位，显示油箱增压空气压力

Boeing recommends that 737NG operators experiencing low-time failures of the PermaCal P/N 90-900-1032 reservoir pressurization gauge install the Rogerson P/N G3721 reservoir pressurization gauge, which is a current 737NG approved spare.

①系统管路或接头漏气

②释压活门打开或漏气

③靠近油箱的单向活门不好，从开口堵头漏气（现象：关闭引气后油箱空气压力保持不了）

    关注 阮工频道