Questions you had never asked before about B737
Join Date: Apr 2008
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For the newer types, I guess, it is just a holdover from the old days.
Join Date: Jan 2004
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CWS P
I disagree that CWS is a waste. It is merely a tool that can be useful in some specific situations.
For example, I like CWS P when the NG is doing the hobbyhorse routine in a VNAV climb. It will still level off (capture an altitude) in this mode. If you enter the mode without selecting N1 on the A/T then the power will come back to hold the selected speed. If you leave it in speed it will function like V/S, which has its place too. Although some shy away from full CWS as it will sail right through an altitude selected on the MCP, there is actually a way to ensure this will not happen: breaking out the autopilot through pressure on the controls in pitch and roll will get you into CWS but with 'CMD' on the FMA vs 'FD', which is what you will see if you get to CWS by simply pressing the button.
FD= no alt capture.
For example, I like CWS P when the NG is doing the hobbyhorse routine in a VNAV climb. It will still level off (capture an altitude) in this mode. If you enter the mode without selecting N1 on the A/T then the power will come back to hold the selected speed. If you leave it in speed it will function like V/S, which has its place too. Although some shy away from full CWS as it will sail right through an altitude selected on the MCP, there is actually a way to ensure this will not happen: breaking out the autopilot through pressure on the controls in pitch and roll will get you into CWS but with 'CMD' on the FMA vs 'FD', which is what you will see if you get to CWS by simply pressing the button.
FD= no alt capture.
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Although some shy away from full CWS as it will sail right through an altitude selected on the MCP, there is actually a way to ensure this will not happen: breaking out the autopilot through pressure on the controls in pitch and roll will get you into CWS but with 'CMD' on the FMA vs 'FD', which is what you will see if you get to CWS by simply pressing the button.
Join Date: Jul 2008
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I also have a question that has been bothering me for a while:
In the case of a loss of all generators (dispatched with APU INOP) and not recoverable.
Apart from a dozen other things you obviously also lose the elec stabtrim. Having a look at the checklist it says to land with flap 15. But since only half of you anti-skid system is working (inboard only?) it seems to be a better idea to land with normal landing flap 40? (flap indicator not working as well)
Establish and manually trim it out on long final with F40 and be careful in case of a go-around with the trim requirement, or follow the stabtrim INOP NNC and go with F15 and taking the extra speed into account for the LDR with partial anti-skid.
The loss of both generators checklist doesn't seem to have a preference.
In the case of a loss of all generators (dispatched with APU INOP) and not recoverable.
Apart from a dozen other things you obviously also lose the elec stabtrim. Having a look at the checklist it says to land with flap 15. But since only half of you anti-skid system is working (inboard only?) it seems to be a better idea to land with normal landing flap 40? (flap indicator not working as well)
Establish and manually trim it out on long final with F40 and be careful in case of a go-around with the trim requirement, or follow the stabtrim INOP NNC and go with F15 and taking the extra speed into account for the LDR with partial anti-skid.
The loss of both generators checklist doesn't seem to have a preference.
Join Date: Jun 2013
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Say WHAT??
From the original: "To start with, I have an electrical question regarding its electrical system:"
I'm certainly glad that your question about the 'electrical system' was an 'electrical question and not perhaps a hydraulic question. Whew . That was a close call!
More seriously, I hope you received a response that you understand.
(Tip that may help: read it out loud, even to yourself, -and before pushing the Send, Publish or Post buttons. Been there and done that. Better luck next time.
I'm certainly glad that your question about the 'electrical system' was an 'electrical question and not perhaps a hydraulic question. Whew . That was a close call!
More seriously, I hope you received a response that you understand.
(Tip that may help: read it out loud, even to yourself, -and before pushing the Send, Publish or Post buttons. Been there and done that. Better luck next time.
' On Britannia Airways 737-200s only the Captain had HDG SEL. The F/O only had CWS in both lateral and vertical axes. Passing the Command Course meant both a pay rise and the luxury of HDG SEL! Alt Hld had to be manually engaged on reaching assigned level, having reduced the rate of climb/descent using CWS. No V/S mode either, but we did have VOR/LOC. All selected through massive rotary switches which engaged with a satisfying clunk. Ah...those were the days!
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Sounds exactly like a B727
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Sounds exactly like a B727
Join Date: Mar 2013
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Hmm mine shows that there isn't! Have just double checked to make sure. Wouldn't be the first time that I have pondered questions arising form this FCOM which have been answered by better manuals.
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I Hope you accept the AMM (Aircraft Maintenance Manual) as an "better manual".
All B737 (100-900) have a check valve in the APU bleed line.
In addition: I know it out of (more than) 25 years as a mechanic, working on this aircraft.
All B737 (100-900) have a check valve in the APU bleed line.
In addition: I know it out of (more than) 25 years as a mechanic, working on this aircraft.
Join Date: Mar 2001
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I want to know what I am supposed to do with the yaw damper indicator?
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Yaw damper switch on, YD works. Switch off, it doesn't.
Probably why they removed the instrument. I have never used it for anything.
When you did the instrument scan, did you check the instrument or the system?
What did you look for? It moved! Thank God!
Have any of you found the two leading edge flaps on each wing?
I must be blind because I can only find one. I've been puzzled about this for years, but I'm scared it's just me who can't find the other one.
Probably why they removed the instrument. I have never used it for anything.
When you did the instrument scan, did you check the instrument or the system?
What did you look for? It moved! Thank God!
Have any of you found the two leading edge flaps on each wing?
I must be blind because I can only find one. I've been puzzled about this for years, but I'm scared it's just me who can't find the other one.
Per Ardua ad Astraeus
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If you are asking as a pilot and you HAVE an indicator, what does your company manual tell you to do? If nothing, then happily ignore, stop worrying and return to blissful ignorance?
Yaw Damper Indicator was used every night during the Daily Check. Or was it Weekly? It's been a while.