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Cases › DCA23FA417 › The analyst

BOEING 737-890Alaska Airlines

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.

3
timed facts
8
precedents
24
passages to ask

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passages, not paraphrases
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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

3 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
  1. 23:14:57 PDTFDRLandingp.5
    The main gear touched down
    see the traces at this moment ↗
  2. 23:14:57 PDTFDRLandingp.5
    The maximum vertical acceleration recorded at touchdown was approximately 1.71g
    see the traces at this moment ↗
  3. 23:14:58 PDTFDRLandingp.5
    The nose gear touched down shortly thereafter
    see the traces at this moment ↗
Recorder events without a clock time
  • 2037 PDTThe aircraft took off from Seattle-Tacoma International Airport and climbed to a cruising altitude of 39,000 feet. No FDR data abnormalities were noted during the cruise.
  • 2245 PDTThe aircraft began its descent
  • Final approachDuring the aircraft's final approach, the aircraft encountered a 60-degree crosswind with recorded windspeeds reaching 43 knots before reducing closer to touchdown
  • After touchdownThrust reverser and spoiler deployment occurred normally
  • End of rolloutThe aircraft came to rest at an approximately 5 degree left roll
FLIGHT DATA RECORDER - SPECIALISTA��S FACTUAL REPORT · 8 events extracted by claude-sonnet-5
How the Board coded the sequence
  1. Landing: Sys/Comp malf/fail (non-power)→
  2. Landing: Landing gear collapse

Precedents

8 closest casesranked by what happened, in the Board's words, and by the findings and occurrences it coded
  • DCA20LA0472019-12-23substantialmatch 98
    BOEING 737-824 · United Airlines
    Denver, CO
    • ●Aircraft › Aircraft systems › Landing gear system
    Landing gear collapse
  • ENG09IA0182009-09-18no fatalitiesmatch 90
    BOEING 767 · Continental Airlines
    Newark, NJ
    • ●Aircraft › Aircraft systems › Landing gear system
    Landing gear collapse
  • DCA20LA1382020-08-19substantialmatch 87
    Boeing 767 · Federal Express
    Los Angeles, CA
    • ●Aircraft › Aircraft systems › Landing gear system
    Landing gear collapseSys/Comp malf/fail (non-power)
  • DCA18FA1442018-04-20substantialmatch 84
    MCDONNELL DOUGLAS DC 9 83(MD-83) · Caribbean Sun Airlines Inc
    Alexandria, LA
    • ●Aircraft › Aircraft systems › Landing gear system
    Landing gear collapseSys/Comp malf/fail (non-power)
  • ENG09IA0092009-07-15no fatalitiesmatch 83
    BOEING 737-3B7 · US AIRWAYS INC
    Charlotte (CLT), NC
    • ●Aircraft › Aircraft systems › Landing gear system
  • ENG08IA0512008-06-27no fatalitiesmatch 83
    BOEING 737 · US AIRWAYS INC
    Phoenix (PHX), AZ
    • ●Aircraft › Aircraft systems › Landing gear system
  • DCA25LA2752025-07-26substantialmatch 82
    BOEING 737-8 · American Airlines, Inc.
    Denver, CO
    • ●Aircraft › Aircraft systems › Landing gear system
    Sys/Comp malf/fail (non-power)
  • ENG10IA0162010-01-07no fatalitiesmatch 81
    DOUGLAS DC8 · ASTAR AIR CARGO INC
    Cincinnati (CVG), OH
    • ●Aircraft › Aircraft systems › Landing gear system

What the record says

a pattern, not a findingacross the 8 closest cases · 8 carry coded findings · 8 have a probable cause
Findings the Board cited in those cases
Occurrences it coded
  • 4 of 8Landing gear collapse
  • 3 of 8Sys/Comp malf/fail (non-power)
  • 3 of 8Aircraft structural failure
  • 2 of 8Aircraft inspection event
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
  • 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.
  • ENG09IA0182009-09-18 · BOEING 767 · Continental Airlines
    Failure of Main Landing Gear (MLG) truck beam was due to contamination of the inner surface corrosion protective layers from hydraulic fluid and deice fluid that resulted in corrosion and intergranular stress corrosion cracking.
  • DCA20LA1382020-08-19 · Boeing 767 · Federal Express
    The left main landing gear’s failure to extend due to the separation of the brake rod retaining hardware from the aft inboard wheel for reasons that could not be determined based on the available evidence.
  • DCA18FA1442018-04-20 · MCDONNELL DOUGLAS DC 9 83(MD-83) · Caribbean Sun Airlines Inc
    the failure of the right main landing gear under normal loads due to fatigue cracking in an area subject to an FAA Airworthiness Directive that was not adequately inspected.
  • 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).