Cases › ENG08IA042 › The analyst
BOEING 737Southwest Airlines, Co.
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.
0
timed facts
8
precedents
5
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
0 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 reportNo timed facts: this docket has no extracted recorder sequence and no transcript.
Recorder events without a clock time
- 1055 CDTSouthwest Airlines Boeing 737-700, registration N551WN, experienced a separation of the right nose landing wheel assembly as it exited runway 31C after landing at the Midway Airport, Chicago, Illinois.
- N/AThe right nose landing wheel assembly separation event was recorded after the last recorded landing.
Flight Data Recorder 10 - Specialist's Factual Report · 2 events extracted by claude-sonnet-5
How the Board coded the sequence
- Taxi-from runway: Aircraft structural failure→
- Taxi-from runway: Landing gear collapse
Precedents
8 closest casesranked by what happened, in the Board's words, and by the findings and occurrences it coded- DOUGLAS DC8 · ASTAR AIR CARGO INCCincinnati (CVG), OH
- ●Aircraft › Aircraft systems › Landing gear system
Aircraft structural failure - BOEING 737 · Southwest Airlines, Co.Los Angeles, CA
- ●Aircraft › Aircraft systems › Landing gear system
Aircraft structural failure - BOEING 737-824 · United AirlinesDenver, CO
- ●Aircraft › Aircraft systems › Landing gear system
Landing gear collapse - EMBRAER ERJ170 200LR · SKYWEST AIRLINES INCSan Antonio, TX
- ●Aircraft › Aircraft systems › Landing gear system
Landing gear collapse - BOEING 737-3B7 · US AIRWAYS INCCharlotte (CLT), NC
- ●Aircraft › Aircraft systems › Landing gear system
Aircraft structural failure - MCDONNELL DOUGLAS DC 9 83(MD-83) · Caribbean Sun Airlines IncAlexandria, LA
- ●Aircraft › Aircraft systems › Landing gear system
Landing gear collapse - BOEING 767 · Continental AirlinesNewark, NJ
- ●Aircraft › Aircraft systems › Landing gear system
Landing gear collapse - BOEING 737-890 · Alaska AirlinesSanta Ana, CA
- ●Aircraft › Aircraft systems › Landing gear system
Landing gear collapse
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
- 8 of 8Aircraft › Aircraft systems › Landing gear systemcited here too
Occurrences it coded
- 5 of 8Landing gear collapse
- 3 of 8Aircraft structural failure
- 2 of 8Sys/Comp malf/fail (non-power)
Set against the Board’s own findings for this case
Cited here, and common in the precedents
- Aircraft systems › Landing gear system
Cited here, not seen in the precedents
- —
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
- ENG10IA0162010-01-07 · DOUGLAS DC8 · ASTAR AIR CARGO INC
Failure of the NLG cylinder occurred by intergranular rupture; coincidental to a chrome plating crack. The failure origin occurred along the inner surface of the cylinder and then propagated by stress corrosion cracking to the outer surface. A secondary crack with the same features as the primary crack was found diagonal to the primary crack. Both cracks initiated by intergranular cracking due to grinding burns caused by abusive grinding and propagated by stress corrosion cracking. Hydrogen embrittlement did not co…
- ENG09IA0142009-09-08 · BOEING 737 · Southwest Airlines, Co.
The failure of the right main landing gear inboard axle due to fatigue cracking as a result of fretting damage in one of the brake mounting bolt holes.
- DCA20LA0472019-12-23 · BOEING 737-824 · United Airlines
Maintenance personnel’s excessive grinding of the left main landing gear’s aft trunnion pin during its initial overhaul, which caused heat damage to the base metal and led to the fatigue crack that caused the pin to fail during the accident flight. Contributing to the accident was the failure of maintenance personnel to detect the excessive grinding during the initial overhaul and the fatigue crack during the subsequent overhaul.
- ENG17IA0052016-12-04 · EMBRAER ERJ170 200LR · SKYWEST AIRLINES INC
A failure of the nose landing gear down lock spring which precluded normal downlock operation of the nose landing gear. The spring failure was due to the presence of too much retained austenite which led to the formation of progressive cracking and subsequent failure of the spring.
- ENG09IA0092009-07-15 · BOEING 737-3B7 · US AIRWAYS INC
The failure of the left hand main landing gear was caused by heat induced cracks resulting from abusive grinding/polishing of the chrome plate that was applied during the last overhaul.
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).