Hydraulic Question

[willby]

Hi, Can anyone supply the CAA/JAA answer to the following feedback question from the AGK exam?

Where is the fluid temp. measured in a hydraulic system?

A. At the resevoir
B. At the ACOV
C. At the pump outlet
D. At the resevoir return outlet.

I have two different answers to this question from two different ATO,S.
One suggests the answer is C and the other A.
Willby

[peb]

I would go for C. At the pump outlet


This is an other example:

Where in a hydraulic system might overheat indicators be installed?

A)At the pumps.
B)In the reservoirs.
C)At actuators.
D)At the coolers.

I would go for A

[conch]

Here a sample from the hydraulic system on the MD83.
The hydraulic temperature is measured in the reservoir at the return inlet.
The return fluid could be heated up by a malfunctioning pump or an internal leak in the system. This causes the hydraulic fluid to flow back to the return line under higher pressure and temperature caused by friction.

[IFixPlanes]

Infos A320 Fam.
...The temperature of the hydraulic fluid is monitored at the outlet of the low pressure
( LP ) filter of each system. The LP filter is the last component in each system before
the fluid returns to the reservoir of that system...

A300 +A310
...In each system, a resistor type overheat sensor on the return line at the reservoir
provides signals, through an electronic overheat monitoring unit...

[Mass Times Velocity]

Might be wrong but I thought it was measured just before returning to reservoir, the memory's not what it used to be.
MTV:{

[skyman68]

MTV u are right, I have seen both answers if my memory is good.

When I see pump somewhere in the answer, I choose pump even if there is no logic in these JAA exams.

Once again, these JAA quizz are a big joke. You just have to learn the 100-300 questions for each paper to guaranty a pass.
So please, stop to tell me that these exams are bloody hard.

Even the NASA have sent a monkey in the space.

[willby]

Hi, Thanks to all who have replied to my query. The jury is still out as to the correct answer it seems, and as has already been suggested the JAA will more than likely will defy logic with their answer.
Willby

[fescalised portion]

I would definitely go with the reservoir!

[PFD]

Reservoir if anywhere.

Some electrical pumps have overheat detectors fitted, for the motor element, but in general it is the temperature of the fluid in the reservoir/low pressure system, that you are concerned about.

I would go for Reservoir.

[willby]

Hi and thanks again to two new contributors FP and PFD. You both go for the resevoir which tallies with one of the two answers I had. It is also imho the correct one so hope it comes up again next month!
Willby

[Topgun 4122T]

I would be interested in hearing Alax's reply to this question , I got this question in my A G K exam not to long ago and I answered it with : aftre the pump , because that's what was in my Bristol feedback ..

[Maximum]

Just to add further confusion :} , on the B737-300 temperature sensors are located in the pump case drain line and pump housing. :=

[Alex Whittingham]

I'll stand by our answer as far as the exams go. 'At the pump'.

[V1 Rotate]

For what it's worth, the Hawker hydraulic system temp sensor is located between the reservoir and the LP filter.
V1 Rotate:cool:

[willby]

Hi,
Thanks again to all who have contributed especially to those contributors since my last post. To end this thread I will bow to Alex Whittinghams vastly superior knowledge and experience especially as far as CAA/JAA exams are concerned.
I note his emphasis " as far as the exams go"......so at the pumps it is then.
Whats out there in the real world and the JAA ,s intepretation of it dont always coincide.
Willby

[PFD]

Alex, Hi

What makes you so certain that, that is the right answer for JAR? ...and I'm not having a go by any means but doesn't it :mad: you off that JAR exams have questions with 2 possible answers and one must be wrong for the exam.:confused:

[Topgun 4122T]

Hi Alax ,

Like PFD i would also be interested in hearing your opnion on why you feel that the answer is at the pump , this question interests me and I would really like to know the correct answer to it or the c.a.a answer to it that is !

[Alex Whittingham]

If I told you I'd have to kill you. The real answer, outside the exams, varies depending on type as the previous answers suggest. One of the problems of the Aircraft General Knowledge subjects particularly is that the questions are meant to apply generally, but once you go past basic principles you have to be asking about specific aircraft systems.

[IFixPlanes]

@Maximum
...on the B737-300 temperature sensors are located in the pump case drain line and pump housing...

This sensors only triggers a overheat warning related to the EMDP.
The temperature of the general hydraulic system is not monitored.

Ingo

[Maximum]

IFixPlanes,

The temperature of the general hydraulic system is not monitored.

................erm, I know. I don't believe I said it was? :ouch:

[PFD]

BTW guys Alex did PM me with an answer I should have said, otherwise it makes him look bad, and he's not all bad ;)