Cases › DCA11FA004 › The analyst
BOEING 757-223AMERICAN AIRLINES INC
What the docket says, assembled. No language model is involved, so nothing on this page can be invented — every line traces to a recorder, a report page or the Board's own record.
6
timed facts
8
precedents
13
passages to ask
Ask the docket
passages, not paraphrasesTry
Every answer is a passage of the docket with the page it came from, or the words “not in the docket”. Nothing is summarised or reasoned for you — read the source.
One timeline
6 timed factsthe recorder events from the FDR report, with the transcript's warnings, callouts, the words nearest each event and the final seconds — on one clock, as printed in each report- 21:13:20 EDTFDRtakeoffp.3Takeoff from Miamisee the traces at this moment ↗
- 21:28:47 EDTFDRclimbp.3'CABIN ALT > 10kft' parameter set along with left and right master warnings; aircraft at 31,993 ft with pitch attitude decreasing (rapid decompression)see the traces at this moment ↗
- 21:28:55 EDTFDRemergency descentp.3Passenger oxygen discrete set to ONsee the traces at this moment ↗
- 21:29:00 EDTFDRemergency descentp.3Descent begansee the traces at this moment ↗
- 21:35:10 EDTFDRdescentp.3Aircraft leveled at approximately 10,000 ftsee the traces at this moment ↗
- 21:57:00 EDTFDRlandingp.3Aircraft landed at Miamisee the traces at this moment ↗
Flight Data Recorder 10 - Specialist's Factual Report · 6 events extracted by claude-fable-5-1 (in-session)
How the Board coded the sequence
- Enroute: Aircraft structural failure
Precedents
8 closest casesranked by what happened, in the Board's words, and by the findings and occurrences it coded- BOEING 737 · SOUTHWEST AIRLINES COCharleston, WV
- ●Aircraft › Aircraft structures › Fuselage
Aircraft structural failure - LOCKHEED 382G-44K-30 · LYNDEN AIR CARGO LLCSt. Mary's, AK
- ●Aircraft › Aircraft structures › Fuselage
Aircraft structural failure - BOEING 737 · SOUTHWEST AIRLINES COYuma, AZ
- ●Aircraft › Aircraft structures › Fuselage
Aircraft structural failure - LOCKHEED 382G · Lynden Air CargoIliamna, AK
- ●Aircraft › Aircraft structures › Fuselage
Aircraft structural failure - Boeing 757-200 · US AIRWAYS INCRichmond, VAAircraft structural failure
- DOUGLAS C 118A · TATONDUK OUTFITTERS LIMITED DBAEmmonak, AKAircraft structural failure
- MCDONNELL DOUGLAS DC 9 33F · Everts AirBethel, AK
- ●Aircraft › Aircraft structures › Fuselage
- BOEING 737-700 · Southwest AirlinesPensacola, FL
- ●Aircraft › Aircraft structures › Fuselage
What the record says
a pattern, not a findingacross the 8 closest cases · 8 carry coded findings · 8 have a probable causeFindings the Board cited in those cases
- 6 of 8Aircraft › Aircraft structures › Fuselagecited here too
Occurrences it coded
- 6 of 8Aircraft structural failure
Set against the Board’s own findings for this case
Cited here, and common in the precedents
- Aircraft structures › Fuselage
Cited here, not seen in the precedents
- Development › Manufacture/production
Common in the precedents, not cited here
- —
A teaching device, not a verdict: what the record would have looked at, next to what the Board found.
In the Board’s words — the closest cases
- DCA09FA0652009-07-13 · BOEING 737 · SOUTHWEST AIRLINES CO
Fuselage skin failure due to preexisting fatigue at a chemically milled step.
- DCA25LA0612024-12-18 · LOCKHEED 382G-44K-30 · LYNDEN AIR CARGO LLC
The fatigue failure of the forward pressure bulkhead canted web that originated from stress corrosion cracking areas. Contributing to the failure were inspection procedures and intervals inadequate to identify the fatigue cracks.
- DCA11MA0392011-04-01 · BOEING 737 · SOUTHWEST AIRLINES CO
the improper installation of the fuselage crown skin panel at the S-4L lap joint during the manufacturing process, which resulted in multiple site damage fatigue cracking and eventual failure of the lower skin panel. Contributing to the injuries was flight attendant A's incorrect assessment of his time of useful consciousness, which led to his failure to follow procedures requiring immediate donning of an oxygen mask when cabin pressure is lost.
- DCA16LA0962016-02-12 · LOCKHEED 382G · Lynden Air Cargo
The fatigue failure of the forward pressure bulkhead canted web that originated from stress corrosion cracking areas. Contributing to the failure were inspection procedures and intervals inadequate to identify the crack.
- DCA08IA0482008-03-22 · Boeing 757-200 · US AIRWAYS INC
The installed wing panel clips failed due to fatigue, likely caused by the incorrect installation of the fasteners in response to SB 757-57-0027. Contributing to the incorrect installation was the SB's lack of clarity in the instructions and figures on the correct orientation of the clips and spacers.
What it recommended after them
- A-08-022TO THE FEDERAL AVIATION ADMINISTRATION: Require operators of Boeing 757 airplanes to conduct a one-time visual inspection of the upper wing fixed trailing edge panel support beam clips for cracks, proper orientation, and spacers, and to rep… · DCA08IA048Closed - Unacceptable Action
- A-08-023TO THE FEDERAL AVIATION ADMINISTRATION: Require operators to report any cracked clips found during the one-time inspection, as requested in Safety Recommendation A-08-22, as well as the part number and orientation of the clips relative to t… · DCA08IA048Closed - Unacceptable Action
- A-08-024TO THE FEDERAL AVIATION ADMINISTRATION: Require Boeing to issue more explicit instructions and figures that clearly illustrate the correct orientation of the clips and spacers that attach the Boeing 757 panel support beam to the wing rear s… · DCA08IA048Closed - Acceptable Action
This is the pattern in the NTSB’s own record across similar accidents — which findings it cited, what it coded, what it recommended. It is drawn from the record, not written about this case, and it never assigns blame: investigations exist to prevent the next accident (ICAO Annex 13).