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707 Flight Data Recorder

Thu Sep 08, 2005 12:13 pm

Today I was once again on Reagan's Air Force 1, and in the cockpit, to the left of the flight engineer's seat, is a box labeled "Flight Data Recorder". It has several numbers to punch-in, including Day, Month, and Take-Off Weight. I don't remember the others, but my question is:
Why would they have to enter the Take-Off Weight into the FDR? Is that done in modern aircraft as well? What happens if the number entered is not correct (Either way, under, or overweight)?
Any info appreciated.

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RE: 707 Flight Data Recorder

Thu Sep 08, 2005 6:23 pm

Presumably so they have a record of the weight should anything happen (? is the FDR a black box or just used to save the data for each flight) and they can relate that to the behaviour of the aircraft.

If the weight is wrong (either entered wrongly or measured wrongly) it would affect any analysis.
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RE: 707 Flight Data Recorder

Thu Sep 08, 2005 8:00 pm

Quoting Videns (Thread starter):
is a box labeled "Flight Data Recorder"

Is this the FDR Control panel,selecting Inputs to the FDR.Where is the FDR located.
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RE: 707 Flight Data Recorder

Fri Sep 09, 2005 4:26 am

The plane in question had a very rudimentary system called VGH installed for at least a little while which required the crew to enter that information. This was in addition to the later added foil tape drive recorder. You need to find someone with either the last pubs or personal knowledge to find out what you're looking at.
You might just try calling the 89th at Andrews to see if there's any "old heads" left "lying about".
The TO weight would be a parameter to be added in the calculation when the engineers are evaluating airframe stress vs. age.
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RE: 707 Flight Data Recorder

Wed Sep 14, 2005 12:35 am

I am an old 89th 707 guy, some of the older systems that were on the jets were simply not used since the 707's got cockpit upgrades. Did you also notice the Loran system on the the navs station which was still operable but useless unless you flying around the Aleutions or the Bering Straight .
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