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Today's Pop Quiz - 10/26/02  
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Posted (11 years 10 months 1 week 3 days 11 hours ago) and read 1288 times:

These are the last 2 questions on the B737. Next week I will switch to one of the following aircraft for a couple of days a rotate until the idea gets old, which I'll know by lack of response:
757, 767, MD80

Sorry guys, those are the only aircraft that I really know. I can't ask questions about smaller aircraft, which was requested earlier. I'm sure different "versions" of this pop quiz will pop up in the forum.

B737-300 thru 900
1). True or false. Without a system failure the 737 Thrust Reverser be deployed in the air.

All B737s
2). Just after takeoff with flaps down, you lose A & B hydraulics. What action needs to be taken to get Standby Hydraulics on to get that rudder available.

9 replies: All unread, jump to last
 
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 1, posted (11 years 10 months 1 week 3 days 11 hours ago) and read 1279 times:

Correction for question 1.
B737-300 thru 900
1). True or false. Without a system failure the 737 Thrust Reverser CAN be deployed in the air.


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 2, posted (11 years 10 months 1 week 3 days 11 hours ago) and read 1269 times:

Hello Cdfmxtech.

I think these pop quiz's are really neat. Please keep doing them.

1). I hope the answer is False, but, I suspect that it's true.

2). I think the pilots would need to deploy the Ram Air Turbine (RAT), however, on second thought, I believe the RAT might only be used to generate electrical power.

This is what you call a "Wild Guess" response. But it's still fun!  Big thumbs up

Chris  Smile



"Just a minute while I re-invent myself"
User currently offlineDelta-flyer From United States of America, joined Jul 2001, 2676 posts, RR: 6
Reply 3, posted (11 years 10 months 1 week 3 days 10 hours ago) and read 1265 times:

Well, I don't know the system architecture of the 737, but I will wager that the engineers designed it thus....

1. The thrust reverser probably requires weight-on-wheels to activate, so I would say FALSE.

2. I believe there is an EMP that powers the Standby Hydraulic system that is fed by an emergency generator from the APU. I would assume that the APU runs during take-off and landing, so it would be a matter of switching on standby hydraulics from the overhead panel.

Pete


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 4, posted (11 years 10 months 1 week 3 days 6 hours ago) and read 1220 times:

You can deploy the T/R's in flight. When the airplane is less than ten feet off the deck. The T/R control system allows you to do this. By the time they are fully deployed the plane will have already touched down. Under normal flight conditions the sync lock prevents TR deployment during flight.

Here's another question. How many actuator does each TR have? And of those how many are locking actuators?

As for a Hydraulic A and B failure you would reach up switch to STBY RUD on your FLT CONTROL A and B guarded switches.

The EDMP for the stby hyd sys runs off ships power so you really wouldn't need the APU running. Unless of course you lost both IDG's at the same time. Or you lost both engines. But then not having stby hyd would be the least of your worries.  Big grin



User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 5, posted (11 years 10 months 1 week 2 days 23 hours ago) and read 1177 times:

LMP737 - you got one of two. Yes u can deploy the Thrust Reversers at less than 10ft OR Ground mode. I don't think it ever happens, but it is available.

As for question 2, the crew would have to do nothing. The standby system will automatically kick in with a loss of hydraulics with flaps down in the air or greater than 60 knots.

And LMP, as for your question, there are 3 on each TR sleeve, and one on each side is a locking actuator. So there are 6 total on each engine.

Mr Spaceman, glad u like this. I hope it is received well by all. I like doing it. As for your answer, the B737s are not equipped with Ram Air Turbines.

I'll try and think of a couple for the B757s and then rotate from there.


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 6, posted (11 years 10 months 1 week 2 days 9 hours ago) and read 1116 times:

I got the second one wrong. How embarrassing. Embarrassment

The first one I had to think about. The way you worded it aroused my suspicion. However I jumped on the second one a little to quickly. Next time I'll be more careful.

Here's another pop quiz. We know that the TR has three actuators, one of them being the locking actuator. Which one is the locking actuator, top, middle or bottom?  Smile


User currently offlineTWAMD-80 From United States of America, joined Oct 2001, 1006 posts, RR: 4
Reply 7, posted (11 years 10 months 1 week 2 days 7 hours ago) and read 1096 times:

I'll call the first answer False. I recall a crash caused by thrust reversers deploying in the air. As for the second, I'm not really sure.

TW



Two A-4's, left ten o'clock level continue left turn!
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 8, posted (11 years 10 months 1 week 2 days 3 hours ago) and read 1071 times:

LMP - if I hadn't dont the TR deactivation procedure as many times as I have, I may have forgotten that it is the upper actuator


User currently offlineLMP737 From , joined Dec 1969, posts, RR:
Reply 9, posted (11 years 10 months 1 week 2 days 1 hour ago) and read 1045 times:

Cdfmxtech:

You are correct, it is the top one.  Smile


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