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Today's Pop Quiz - 11/1/02  
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Posted (12 years 1 month 2 weeks 6 days 14 hours ago) and read 1461 times:

B767 Series

You walk into a dead B767 Flightdeck. You turn on the APU and supply electrical and pneumatic power and check the ovhd panel configuration. All hydraulic switches are off. You turn on both L & R electric hydraulic pumps and 1 of the center electric pumps. You do you walkaround and return to the flightdeck. You shutoff off all hydraulics. You then sit down and attempt to bleed down the brakes to check your accumulator precharge. But the brake gage is not letting up. It is maintaining 3000 psi. Then you remember that you just got tested on this the other day on Airliners.net, so you check the reserve brake switch. It is selected. Now before you think you have got it....

You check the overhead panel to see if any pump low pressure lights are out. Which lights, if any are out??
Which pump(s) are operating??
Is there anything wrong??




10 replies: All unread, jump to last
 
User currently offlineRmm From Australia, joined Feb 2001, 525 posts, RR: 1
Reply 1, posted (12 years 1 month 2 weeks 6 days 7 hours ago) and read 1393 times:

I haven't worked on a 767 for sometime, but here goes.

With the reserve brakes selected on the R/H pump should be running. The reason I think the brakes wont bleed off is that the fluid has no return path to the centre system resevior.

Rmm


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 2, posted (12 years 1 month 2 weeks 5 days 17 hours ago) and read 1343 times:

I guess maybe I made this one a little too hard!!

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 3, posted (12 years 1 month 2 weeks 5 days 15 hours ago) and read 1331 times:

With the reserve brake select switch ON:

1. The C1 electric hydraulic pump PRESSURE light will be off. This pump is operating.

2. The VALVE light on the reserve brake select switch should be off
(If not, that’s a problem).

3. The ISLN light on the P61 panel will be on.

4. Center hydraulic pressure will be indicated on EICAS

5. The center system PRESSURE light will be off.

When you select the reserve brake switch AUTO:

1. The C1 pump light will go off.

2. The VALVE light on the reserve brake select switch should come on for 2-3 seconds, then goes off. This indicates the valves have transited from closed to open.

3. The ISLN light on the P61 panel will go off.

4. The Center hydraulic pressure on EICAS will drop to zero.

5. The center system PRESSURE light will come on.

If the ISLN light on the P61 panel does not go off when you select reserve brakes AUTO:

Check the hydraulic quantity in the center system reservoir. The system detected a low quantity condition while the aircraft was in flight. The isolation valves are latched in closed position.


Cdfmx: Please check your Email.



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 4, posted (12 years 1 month 2 weeks 5 days 13 hours ago) and read 1322 times:

Ref. previous post:

1. The C1 pump light will go off.

I meant to type:

1. The C1 pump light will come on.






"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 5, posted (12 years 1 month 2 weeks 5 days 9 hours ago) and read 1304 times:

So u cheated again!!  Laugh out loud

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 6, posted (12 years 1 month 2 weeks 5 days 6 hours ago) and read 1283 times:

So u cheated again!!

That is correct. Smile

Please excuse me, but if I want to be absolutely sure of answers to some of your questions, I am not ashamed to admit that I need to peek at the books a bit.

Some of the scenarios you put forth require a considerable knowledge of the systems involved. And you, Cdfmxtech, can be a sneaky son of a gun.  Big grin

Don't get me wrong, I like that trait.

In several of these discussions, you yourself, myself and other posters have admitted that we have gotten things wrong because we were going from memory or "the head or brain".

For my entire career in aviation, I have been trained to rely on the authorized, certified and current published version of the Aircraft Maintenance Manual, and not to rely on "we've always done it that way", "that's how it worked on the other airplane" or "my buddy said do this".

I believe the only way to ensure accurate performance of maintenance tasks, and to understand how the aircraft operates is to follow the Final Authority: the Aircraft Maintenance Manual.

It's almost the same as pilots following their checklist. Ninety-Nine point Nine per cent of the time, it will save your life.

I know it's supposed to be a "Pop Quiz", but I'd rather give a correct answer obtained from some study rather than a wrong one from the info that I think is right.

Too many variables involved.

Remember:

The Final Authority Is the Aircraft Maintenance Manual.

How about the email? Did you ever get it?



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 7, posted (12 years 1 month 2 weeks 5 days 4 hours ago) and read 1277 times:

Hey, I hope u didn't take that "cheated" thing personally. I was only responding to your reply in the Quiz for 11/2/2002 (The strange thing is, I just looked in the AMM (I cheated again....)

If I could put a number on it, I would say that half of this job (AMT) is knowing WHERE to find things. There are a hell of alot of things that we all keep in our head pertaining to system operation, but it can get very tricky...especially when you work more than one aircraft. It is a challenge going from one gate that has a B737 Classic then to the next where there is a Next Gen. Then an hour later you've got a B757, and then if that wasn't enough switching, here comes an MD-80.

I'll admit, this started out as a Pop Quiz, but since guys started answering so quick, I tried to turn it up a notch. Now, it has almost turned into a "real-life gatecall" quiz.  Big thumbs up

BTW - I never received the e-mail. I will e-mail u again so u can reply to it.


User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 8, posted (12 years 1 month 2 weeks 17 hours ago) and read 1196 times:

Hi. Could any of you two tell me which is the P61 panel and what it does? (is it overhead?) Thanks

-Alfredo


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 9, posted (12 years 1 month 2 weeks 17 hours ago) and read 1197 times:

The P61 panel is the panel where the Flight Engineer used to be (commonly called the Flight Engineers Memorial).
This panel is mainly a Maintenance Only Panel. Some system tests can be iniated from this panel.
The seonc oberserver has some audio equipment over there as well.


User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 10, posted (12 years 1 month 2 weeks 7 hours ago) and read 1159 times:

Thanks for responding. These quizzes are really informative, I appreciate it.

-Alfredo


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