Welcome Guest [Log In] [Register]
Welcome!

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free.

Join our community!

Username:   Password:
Add Reply
Flight data regarding stops.; Entire FDR history
Topic Started: Jan 10 2010, 08:33 PM (1,387 Views)
JFK
Member Avatar

The following is from flight 77's Flight data and is soley concerned with it's stops
throughout the entire history recotded on the Flight Data Recorder data.
The attached "Touchdown.CSV" file is a culmination of Warren Stutt's decoder program
with some parameter additions by myself.

Row 4167 10:06:00 GMT Landing gear down and locked.
Row 4673 10:14:26 GMT Engine Stop. Lat/Long : 41.97824 -87.90436

( 1 missing frame )

Row 4674 12:03:24 GMT Engine start Lat/Long : 41.97550 -87.89577
Row 5786 12:22:07 GMT Landing Gear Up.


Row 13230 14:26:05 GMT Landing Gear down and locked.
Row 13736 14:34:37 GMT Engine Stop. Lat/Long : 28.43708 -81.31840

( 3 missing subframes )

Row 13737 16:14:27 GMT Engine start Lat/Long : 28.43004 -81.31136
Row 14243 16:23:05 GMT Landing Gear Up.


Row 22312 18:37:34 GMT Landing Gear down and Locked.
Row 23200 13:52:12 GMT Engine Stop. Lat/Long : 41.95078 -87.90144

( 0 missing subframes )

Row 23201 20:03:05 GMT Engine Start Lat/Long : 41.97001 -87.89869
Row 24498 20:24:52 GMT Landing Gear Up.


Row 38465 00:17:51 GMT Landing Gear Down and Locked.
Row 38810 00:23:36 GMT Engine Stop. Lat/Long : 33.93951 -118.39811

( 0 missing subframes )

Row 38811 and 38812 odd lat/longs... Close, but unexpected.

Row 38813 01:38:19 GMT Engine start Lat/Long : 33.94501 -118.40618
Row 39525 01:50:23 GMT Landing Gear Up.


Row 53482 05:42:59 GMT Landing Gear Down and Locked.
Row 54438 05:58:56 GMT Engine Stop. Lat/Long : 41.99009 -87.91895

( 2 missing subfranes )

Row 54439 15:12:52 GMT Engine Start Lat/Long : 41.97464 -87.90436
Row 55414 15:29:54 GMT Landing Gear Up.


Row 68904 19:14:16 GMT Landing Gear Down and Locked.
Row 69496 19:24:08 GMT Engine stop. Lat/Long : 33.94020 -118.39931

( 1 blank subframe )

Row 69498 20:59:58 GMT Engine Start Lat/Long : 33.93883 -118.40687
Row 70425 21:15:37 GMT Landing Gear Up.


Row 82795 00:41:47 GMT Landing Gear Down and Locked.
Row 83583 00:54:55 GMT Engine Stop. Lat/Long : 41.98065 -87.89818

( 1 missing subframe and 1 partial subframe ) * see note - Changes from 12 to 10.

Row 83584 15:16:37 GMT Engine Start Lat/Long : 41.97481 -87.89938
Row 84397 15:30:21 GMT Landing Gear Up.


Row 97314 19:05:38 GMT Landing Gear Down and Locked.
Row 97709 19:12:13 GMT Engine Stop. Lat/Long : 33.94089 -118.40773

( 2 missing subframes )

Row 97710 21:02:22 GMT Engine Start Lat/Long : 33.93814 -118.40773
Row 100251 21:44:55 GMT Landing Gear Up.


Row 113393 01:23:57 GMT Landing Gear Down and Locked.
Row 113907 01:32:31 GMT Engine Stop. Lat/Long : 41.96777 -87.90436

( 1 missing subframe )

Rows 113908 - 113920 - Maintainance on Groundspeed Indicator, Lat/Long reads 0.0 0.0

( 3 missing subframes ) * see note - Changes from 10 to 24.

Row 113921 14:07:11 GMT Engine Start Lat/Long : 41.97361 -87.90367
Row 114901 14:23:43 GMT Landing Gear Up.


Row 128193 18:05:15 GMT Landing Gear Down and Locked.
Row 129594 18:28:36 GMT Engine Stop. Lat/Long : 33.94810 -118.39296

( 1 partial and 3 missing subframes )

Row 129596 19:52:02 GMT Engine Start Lat/Long : 33.94501 -118.40618
Row 130275 20:03:33 GMT Landing Gear Up.


Row 145697 00:20:35 GMT Landing Gear Down and Locked.
Row 146117 00:27:46 GMT Engine Stop. Lat/Long : 38.94001 -77.45293

( 2 missing subframes )

Row 146118 12:10:46 GMT Engine Start Lat/Long : 38.93932 -77.45087
Row 146688 12:20:28 GMT Landing Gear Up.


Row 151368 13:37:52 GMT Final frame. Lat/Long : 38.87032 -77.06154

* NOTE : Word 207 is supposed to represent the F/O's Groundspeed, however it does not. And there is something else being recorded there in subframes 2 and 4.
What that something is I do not know but the 3 values in order are
12, 10, and 24 in BCD form, or
18, 10, and 30 in Decimal, or
0000 0001 0010, 0000 0000 1010, and 0000 0001 1110 in binary.
Edit to add - Warren Stutt has just informed me that "ACMS S/W P/N CODE" also changes at those points
( Word 256, Superframe 3, Subframe 4, Bits 1-12 )

I have searched the BTS for departure and arrival dates for flight 77 in order to attach dates to these landing and other than it's final departure I have come up with zilch.

Does someone else want to try ?
Edited by JFK, Jan 13 2010, 06:44 PM.
Offline Profile Quote Post Goto Top
 
JFK
Member Avatar

OK, Lets talk about Word 256, Superframe 3, Subframe 4, bits 1-12.
( Superframes are off by 1 in word 256 in the Custom AA DFL 757_3b-1.txt )

This is labeled "ACMS S/W P/N CODE".

[Section Redacted]

D226A101-3G.pdf refers you to note 2F which reads as follows :
Quote:
 
NOTE 2F ACMS and Mandatory Software Part Number Recording ( 757-1,-2,-3,-3A,-3B,-4 )

ACMS ( optional ) and Mandatory software part numbers shall be recorded in the data frame by using a binary code from 0 to 4095. This code shall be correlated to the actual supplier software part number in the supplier Version Description Documentation (VDD). The code must uniquely identify a software part number or combination of part numbers.
A second option is to broadcast the software part number(s) one character at a time in ISO#5 format continously recording the part number in lieu of a unique code.


The 3 numbers recorded in this parameter throught the entire FDR flight history are :
BCD - 214, 314, 394
Unsigned Decimal - 526, 782, 910
Edited by JFK, Jan 14 2010, 02:51 PM.
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · American Flight 77 · Next Topic »
Add Reply