737ng油箱，reduced back-pressure condition是什么意思？

dandy2012 · 发表于 2013-6-12 12:06:17

这是737油箱间导油工卡的一部分，其中的reduced back-pressure condition我不太明白是怎么个情况？在工卡的后半部分也有说NOTE: Turning on the main tank boost pumps will increase back-pressure to the center tank boost pumps.但是我不懂为什么 back-pressure为什么会引起相应油泵的LOW PRESSURE灯亮？求指点

(13) Obey these fuel pump limitations during the pump operation:
(a) To operate any of the fuel pumps, you must be in the flight compartment to continuously
monitor the fuel quantity and the low pressure indication in the applicable tank.
(b) Immediately set the applicable fuel pump switch(es) to OFF if the LOW PRESSURE light
comes on and stays on unless there is a reduced back-pressure condition.
NOTE: When you defuel or transfer fuel with minimum backpressure to the pumps, it is
possible for the LOW PRESSURE light(s) to come on. In this case, monitor tank
quantity and set the pump switch to OFF if tank quantity is not changing.
1) If one LOW PRESSURE light comes on because of a reduced back-pressure condition,
do these steps:
a) Put the applicable fuel boost pump switch to OFF and continue defueling.
b) If the remaining LOW PRESSURE light for the fuel boost pump switch for the tank
comes on, monitor the tank quantity.
c) If the fuel quantity for the fuel tank does not change, then immediately set the fuel
pump switch(es) to OFF.
d) For the No. 1 or No. 2 tank, do not operate the main boost pumps with fuel quantities
less than 100 lb (45 kg).
e) If the automatic shutoff system for the center tank boost pump is disabled, do not
operate the center tank boost pumps with fuel quantities less than 2000 lb (907 kg).
2) If two LOW PRESSURE lights for the fuel boost pump switches in the tank come on at
the same time, do these steps:
a) For the No. 1 or No. 2 tanks, put the AFT fuel boost pump switch to OFF and
continue to monitor the tank quantity.
b) For the center tank, put one of the fuel boost pump switches to OFF and continue to
monitor the tank quantity.
c) If the fuel quantity in the tank does not change, immediately put the remaining fuel
boost pump switch to OFF.
d) For the No. 1 or No. 2 tank, do not operate the main boost pumps with fuel quantities
less than 100 lb (45 kg).

txy1222 · 发表于 2013-6-12 20:50:06

英文版？晕

百步穿羊 · 发表于 2013-6-15 17:24:53

这个句子的翻译还是要结合这段：NOTE: When you defuel or transfer fuel with minimum backpressure to the pumps, it is
possible for the LOW PRESSURE light(s) to come on. In this case, monitor tank
quantity and set the pump switch to OFF if tank quantity is not changing
理解起来就是打压时没有向一些需要较大压力才能供过去的情况（根据力的相互作用那么向泵就会受较大的反作用力），在放串油时，流出来的比较容易，相对于供压甚至没有力反作用，泵所受的反作用力比较小，当低压灯亮的时候就关注油量是否还在变化，要是不变了就关，其他情况要立马关断。这么理解那么翻译这个词可以翻译还是自己视情吧。我认为可以翻译成：较弱的反作用力

何塞 · 发表于 2013-6-20 10:11:34

学习下高手很多啊

xuehaiwuya · 发表于 2013-6-20 12:17:09

看着眼花

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[28燃油] 737ng油箱，reduced back-pressure condition是什么意思？

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