737 - CWS switch.
Thread Starter
Joined: Aug 2001
Posts: 865
Likes: 15
From: Greater Aldergrove
737 - CWS switch.
Folks,
Can anyone provide an idiots explanation for what the CWS button on a 737 glareshield is for? Two of them live just underneath the A/P buttons.
Also, what is the very small dial in the top right of the PFD for?
Thanks in advance from an interested amateur!
Can anyone provide an idiots explanation for what the CWS button on a 737 glareshield is for? Two of them live just underneath the A/P buttons.
Also, what is the very small dial in the top right of the PFD for?
Thanks in advance from an interested amateur!
Paid up
Joined: Jan 2002
Posts: 601
Likes: 0
From: UK
CWS - makes it fly like an Airbus. Is that idiotic enough? Basically, the autopilot 'remembers' the pitch/bank you set it at and flys it until told otherwise.
Not exactly sure which dial you mean. Plse provide further description.
Not exactly sure which dial you mean. Plse provide further description.
Thread Starter
Joined: Aug 2001
Posts: 865
Likes: 15
From: Greater Aldergrove
Thanks for the CWS answer.
There is a small dial displayed in the top right of the PFD, just left of the top of the altitude tape. Seen flightdeck pictures in !!!!!!!!!!!!!!, and this dial is present only some of the time.
It has no scale, just a number updating as the needle swings round. Think the range is in single figures with one decimal place.
Just curious...
There is a small dial displayed in the top right of the PFD, just left of the top of the altitude tape. Seen flightdeck pictures in !!!!!!!!!!!!!!, and this dial is present only some of the time.
It has no scale, just a number updating as the needle swings round. Think the range is in single figures with one decimal place.
Just curious...
Paid up
Joined: Jan 2002
Posts: 601
Likes: 0
From: UK
that dial
Still not sure what you mean. It's been a while since I flew the NG, plus airlines can have the displays programmed differently. If you post a link to a picture I could probably tell you what it is.
Regarding CWS, it stands for Control Wheel Steering. It's a very rarely used feature - our SOPs state it's only for use in severe turbulance.
Regarding CWS, it stands for Control Wheel Steering. It's a very rarely used feature - our SOPs state it's only for use in severe turbulance.
Joined: Jul 2002
Posts: 105
Likes: 0
From: US
DIAL
I think you are referring to the Radio Altimeter. On some NGs - but not all - the RA changes from a digital to a combination digital and dial below 1,000' AGL. There is a small indicator on the dial showing the RA minimums which have been set. The display also turns amber when below minimums.
LL
LL
Joined: Aug 2004
Posts: 13
Likes: 0
From: Sweden
The dial on the PFD is most likely the Angle of Attack (AOA) indications.
Here is a short extract from AERO Boeing Oct 2000:
"The AOA indicator on the PFD shows an analogue and a digital display of the AOA. When landing flaps are selected a 3 degree wide green band is visible, it is centered at an AOA equivalent to Vref+5 (assuming nominal gross weight, mid CG, no sideslip, a stabilized 3 degree glide skope-thrust level and no system error). Normally the band accounts for expected variations."
Here is a short extract from AERO Boeing Oct 2000:
"The AOA indicator on the PFD shows an analogue and a digital display of the AOA. When landing flaps are selected a 3 degree wide green band is visible, it is centered at an AOA equivalent to Vref+5 (assuming nominal gross weight, mid CG, no sideslip, a stabilized 3 degree glide skope-thrust level and no system error). Normally the band accounts for expected variations."
Thread Starter
Joined: Aug 2001
Posts: 865
Likes: 15
From: Greater Aldergrove
http://www.!!!!!!!!!!!!!!/open.file/303278/L/
Folks,
You can see the small dial in this picture. Top right of the PFD, beside the top end of the altitude tape.
Seems to range from -1 to +6 or thereabouts.
Folks,
You can see the small dial in this picture. Top right of the PFD, beside the top end of the altitude tape.
Seems to range from -1 to +6 or thereabouts.
Joined: Aug 2004
Posts: 13
Likes: 0
From: Sweden
You can see the small dial in this picture. Top right of the PFD, beside the top end of the altitude tape.
"Analog Needle (white)
Indicates analog AOA value.
- needle travel is limited to a range of -6 degrees and +21 degrees
- fixed at 0.0 degrees when on the ground and ground speed is less than 80 knots."
The angle of attack indications display ADIRU (Air Data Inertial Reference System) aircraft body angle of attack.
Joined: Aug 2001
Posts: 755
Likes: 0
From: Europe-the sunshine side
top right PFD:
Radio altitude-Round dial:
*digital display from 2500 to 1000 ' AGL
*round dial displays below 1000' AGL
*pointer indicates selected radio altitude minimums
*the circumference of the dial is added to,or taken away from,to depict the a/c radio altitude
737NG FCOM 10.11.15
There is no AOA pointer on the PFD,except maybe the FPV,which displays flight path angle relative to horizon line and drift angle relative to display centre.
Noak,maybe all this differ from a/c to a/c depending on first buyer requests. Can you tell me the page in FCOM where you found that,and also where would be the Radio altitude indicated on your NG. (is this aoa by any chance only on the 800 series?)
Radio altitude-Round dial:
*digital display from 2500 to 1000 ' AGL
*round dial displays below 1000' AGL
*pointer indicates selected radio altitude minimums
*the circumference of the dial is added to,or taken away from,to depict the a/c radio altitude
737NG FCOM 10.11.15
There is no AOA pointer on the PFD,except maybe the FPV,which displays flight path angle relative to horizon line and drift angle relative to display centre.
Noak,maybe all this differ from a/c to a/c depending on first buyer requests. Can you tell me the page in FCOM where you found that,and also where would be the Radio altitude indicated on your NG. (is this aoa by any chance only on the 800 series?)
Joined: May 2002
Posts: 132
Likes: 0
From: USA
The little "dial" at the top right is indeed an AOA indicator. It's one of the many display configuration options available with the Honeywell cockpit. AA uses it and the Rad Alt is in the bottom center of the PFD.
Joined: Apr 2002
Posts: 386
Likes: 0
From: UK
I use CWS if i am stuck at let's say an intermediate level with cloud ahead with possible turbulence. advance thrust levers and CWS pitch to play with the rate of climb and speed just to skim over the cloud if climb clearance is given.
Works much quicker than the slow LVL Change adjustments in pitch and power
Works much quicker than the slow LVL Change adjustments in pitch and power
Joined: Aug 2001
Posts: 755
Likes: 0
From: Europe-the sunshine side
Shaka : are you doing that with pax on board? I find hard to believe you're flying a 737 ,in uk,actually I believe you're flying it on FS2000.No real airline pilot will do the trick you've just described.
LVL CHG slow? Try engaging it and reducing comanded speed at the same time. Gee..I'd like to have you on my plane,sitting on the last row while I'll perform the 'avoiding wx' maneuvre you've just described.
LVL CHG slow? Try engaging it and reducing comanded speed at the same time. Gee..I'd like to have you on my plane,sitting on the last row while I'll perform the 'avoiding wx' maneuvre you've just described.
Joined: Apr 2002
Posts: 386
Likes: 0
From: UK
Can you not make an insult like that?
I happily fly the aircraft in CWS (all 737's!), it's a quite natural maneuver, I'm just saying instead of tweaking the speed all the time, you now just play with the pitch as required to come over the top whilst keeping an eye on the speed...
What's so hard for you to believe alexban and I do appreciate it if you just stop being such a prejudice, for one I didn't ask for it!
I happily fly the aircraft in CWS (all 737's!), it's a quite natural maneuver, I'm just saying instead of tweaking the speed all the time, you now just play with the pitch as required to come over the top whilst keeping an eye on the speed...
What's so hard for you to believe alexban and I do appreciate it if you just stop being such a prejudice, for one I didn't ask for it!
