FDR parameters/indication of impact, Any indications of pole impact? Options

[rob balsamo]

I went over parameters to see if any indications show abnormal to suggest a pole impact between :43-:44 since we know that the aircraft was over poles 1 and 2 prior to :44.

So far this is what i have..

Bleed Duct Pressure - normal/nochange
Engine RPM - normal (no indication of rollback)
AC Bus Volts - normal/no change
Left/Right Fuel pumps - High Pressure (no change)
Fuel Tank Density all tanks - normal trend (doesnt show puncture)
Engine EGT - Normal/Nochange
Engine gen - OK/ON
Engine EPR - High/No Change
Engine Fuel Flow - High/No Change (No leak)
Engine Oil Pressure - Normal
Engine N2, N3 - No change
Engine Oil Press, Temp, Quantity - Normal/No Change
Engine Vibration - Normal/No change (engine shows more vibration during take off)
Engine Out (off) - False (its running)
Fan Inlet Temp - No change
Filter Vibration - No change
Hydraulic Pumps - normal/no change
Hydraulic Pressure - Normal/No Change
Master Warning - On (Corresponds with Overspeed warning)


Thats it. As you can see, there are no indications throughout the above parameters that the airplane hit pole 1 or 2. All indications are normal

Engine indications are for both engines.

[lunk]

This would mean that the airplane that this FDR was in,
did not hit the light poles.

...wonder if it hit anything at all...

imo, lunk

[Omega892R09]

I went over parameters to see if any indications show abnormal to suggest a pole impact between :43-:44 since we know that the aircraft was over poles 1 and 2 prior to :44.

Engine N2, N3 - No change

That suggests a three spool engine which, I think, means Rolls-Royce RB211-535E4 or Rolls-Royce RB211-535E4B as I think the P&W 2000 series are two spool.

Correct me if I am wrong but this diagram of a P&W:

Flight cut way Diagram of a P&W 2000 series

suggests a twin spool.

Could be worth keeping in mind when looking at 'official pictures' of plane debris, you know that stuff brought in special from a bone yard somewhere.

This post has been edited by Omega892R09: Sep 5 2008, 12:14 PM

[dMz]

That suggests a three spool engine which, I think, means Rolls-Royce RB211-535E4 or Rolls-Royce RB211-535E4B as I think the P&W 2000 series are two spool.

Correct me if I am wrong but this diagram of a P&W:

Flight cut way Diagram of a P&W 2000 series

suggests a twin spool.

Could be worth keeping in mind when looking at 'official pictures' of plane debris, you know that stuff brought in special from a bone yard somewhere.

I just graphed the N1, N2, and N3 RPM columns for the NTSB-provided SSFDR data (after 09:15:00 EDT). Here is the chart:

http://flickcabin.com/public/view/19000

Although it looks difficult to locate specific ones, engine cutaways are available at O892's link:

http://www.flightglobal.com/airspace/photo...ys/default.aspx

Related threads are at:

Final AA77 SSFDR Parameters Per NTSB: Analysis, Overview, and Review
http://pilotsfor911truth.org/forum//index....showtopic=16066

Jet Engines
http://pilotsfor911truth.org/forum//index....showtopic=13951