DC-9 photo question
#1
DC-9 photo question
I asked this question in the photo section yesterday and still no response so I will go right to the people in the know! There is a cockpit photo of a dc9 in the photo section, (your window thread) and I was wondering what the rectangular thing with the arrows is just to the right of the gear handle, also duplicated on the left side of the panel also. Thanks in advance to the "9" pilots for this one.
#2
It's called a "comparator" or something like that. It looks at the approach instruments for each side of the cockpit and compares them to ensure they are both reliable. If it detects a problem, it is supposed to direct a ga/ma and give you an indication of which portion (CA/FO side, course, glide path etc.) of the instrumentation is unreliable. Its been a while, but that is the best way I can describe it without getting too deep.
#3
Line Holder
Joined APC: Nov 2008
Position: Gear yanking 76ER class worker....."one ping only. Vasili.."
Posts: 74
Without seeing the actual photo in front of me, but having the image burned into my brain from thousands of hours staring at it around the midwest, my guess is it is the instrument comparator.
The comparator monitors both stations' flight instruments and flashes when they are in disagreement. (ie. bad Vertical Gyro). The arrows will illuminate green or red and point at the good or bad side respectively. Most useful when shooting Cat II approaches with a 40 year old autopilot (and a 40 year old co-pilot for that matter!)
Works good, lasts long. Bang it fit, paint it to match...it's a -9!
8Cherry
The comparator monitors both stations' flight instruments and flashes when they are in disagreement. (ie. bad Vertical Gyro). The arrows will illuminate green or red and point at the good or bad side respectively. Most useful when shooting Cat II approaches with a 40 year old autopilot (and a 40 year old co-pilot for that matter!)
Works good, lasts long. Bang it fit, paint it to match...it's a -9!
8Cherry
I asked this question in the photo section yesterday and still no response so I will go right to the people in the know! There is a cockpit photo of a dc9 in the photo section, (your window thread) and I was wondering what the rectangular thing with the arrows is just to the right of the gear handle, also duplicated on the left side of the panel also. Thanks in advance to the "9" pilots for this one.
#4
What they said...
Note the last flap positions have been blocked so this is probably NOT an -80 but your basic -9. Also note the wonderful blue theme that is also found on most Russian aircraft.
Now for a small quiz. look at the photo and see if you can find the required mag compass. Don't spend a long time at it however.
The -80 is the ONLY airplane I have ever flown where with an engine loss, the landing lights retract.
#5
What they said...
Note the last flap positions have been blocked so this is probably NOT an -80 but your basic -9. Also note the wonderful blue theme that is also found on most Russian aircraft.
Now for a small quiz. look at the photo and see if you can find the required mag compass. Don't spend a long time at it however.
The -80 is the ONLY airplane I have ever flown where with an engine loss, the landing lights retract.
#6
#7
Line Holder
Joined APC: Nov 2008
Position: Gear yanking 76ER class worker....."one ping only. Vasili.."
Posts: 74
notes on the "Instrument Warning Panel"....I always called it a comparator...they had one on the early Lears as well
DC-9 34.20.42
NAVIGATION
Controls and Indicators
NAV/INST Warning Display (some aircraft)
Location
A NAV/INST (navigation/instrument) warning display is located on the captain’s and first officer’s instrument panels.
Function
The NAV/INST warning displays assist the flight crew in the early recognition of some navigation equipment disagreements and flight instrument failure conditions.
1.Comparator lights
Illuminate to indicate that a difference exists between two identical systems. (some aircraft - GP EXT position is blank.)
2.INST (instrument) warning lights
Illuminate red to indicate that an instrument has a failure warning flag in view. The red INST light points toward the crew position where the failed instrument is located. The opposite INST light will illuminate green to signify that the instruments at that crew position are not affected. (The GA warning lights will illuminate in conjunction with the INST warning lights.)
3.GA (go-around) warning lights
Illuminate red to indicate that an instrument failure has occurred (INST warning light will also be illuminated) and the failed instrument is not to be used during a go-around. Illuminates green to indicate that an instrument failure has occurred but the failure does not affect go-around capability. The red GA light points toward the crew position where the failed instrument is located. The opposite GA light will illuminate green if the instruments at that crew position are not affected.
Note:The INST and GA lights will illuminate in conjunction with each other.
J340132C42153THROTTLELOCRADALTMONITORHDGHORIZONGPA/P
Aug 1, 2005
DC-9 34.20.43
NAVIGATION
Controls and Indicators
NAV/INST Warning Display (some aircraft) (continued)
4.THROTTLE light (some aircraft)
Illuminates to indicate the autothrottle engage lever has returned to the OFF position for any reason.
5.A/P (autopilot) arrow
The A\P arrow can illuminate either red or green.
Functions:
A\P GREEN - Illuminates to indicate a navigation instrument failure that does not affect autopilot operation. It is reset by pressing the INST WARN RESET button adjacent to the instrument failure warning annunciator.
A\P RED - Illuminates to indicate that the autopilot has been disconnected by any means other than the control wheel auto pilot release switch(es). It is reset by pressing either control wheel autopilot release button.
(-50) Flashes instead of steady illumination. It is reset by pressing either control wheel autopilot release button.
J340132C42153THROTTLELOCRADALTMONITORHDGHORIZONGPA/P
Aug 1, 2008
sorry for the format, I don't know how to upload a Pdf
[IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot-1.jpg[/IMG]
DC-9 34.20.42
NAVIGATION
Controls and Indicators
NAV/INST Warning Display (some aircraft)
Location
A NAV/INST (navigation/instrument) warning display is located on the captain’s and first officer’s instrument panels.
Function
The NAV/INST warning displays assist the flight crew in the early recognition of some navigation equipment disagreements and flight instrument failure conditions.
1.Comparator lights
Illuminate to indicate that a difference exists between two identical systems. (some aircraft - GP EXT position is blank.)
2.INST (instrument) warning lights
Illuminate red to indicate that an instrument has a failure warning flag in view. The red INST light points toward the crew position where the failed instrument is located. The opposite INST light will illuminate green to signify that the instruments at that crew position are not affected. (The GA warning lights will illuminate in conjunction with the INST warning lights.)
3.GA (go-around) warning lights
Illuminate red to indicate that an instrument failure has occurred (INST warning light will also be illuminated) and the failed instrument is not to be used during a go-around. Illuminates green to indicate that an instrument failure has occurred but the failure does not affect go-around capability. The red GA light points toward the crew position where the failed instrument is located. The opposite GA light will illuminate green if the instruments at that crew position are not affected.
Note:The INST and GA lights will illuminate in conjunction with each other.
J340132C42153THROTTLELOCRADALTMONITORHDGHORIZONGPA/P
Aug 1, 2005
DC-9 34.20.43
NAVIGATION
Controls and Indicators
NAV/INST Warning Display (some aircraft) (continued)
4.THROTTLE light (some aircraft)
Illuminates to indicate the autothrottle engage lever has returned to the OFF position for any reason.
5.A/P (autopilot) arrow
The A\P arrow can illuminate either red or green.
Functions:
A\P GREEN - Illuminates to indicate a navigation instrument failure that does not affect autopilot operation. It is reset by pressing the INST WARN RESET button adjacent to the instrument failure warning annunciator.
A\P RED - Illuminates to indicate that the autopilot has been disconnected by any means other than the control wheel auto pilot release switch(es). It is reset by pressing either control wheel autopilot release button.
(-50) Flashes instead of steady illumination. It is reset by pressing either control wheel autopilot release button.
J340132C42153THROTTLELOCRADALTMONITORHDGHORIZONGPA/P
Aug 1, 2008
sorry for the format, I don't know how to upload a Pdf
[IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot-1.jpg[/IMG]
#9
Gets Weekends Off
Joined APC: Jan 2009
Posts: 110
After re-reading your question, I see I did misread it, sorry. But to answer it...Alt hold.
Last edited by RichieAshburn; 05-21-2009 at 06:45 AM.
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