Accident · 2019-12-22
What the record says
- Event date
- 2019-12-22
- Event type
- Accident
- Highest injury level
- No injuries
- Aircraft
- BOEING 737-824 (N87513)
- Operating rule
- Part 121
- Operator
- UNITED AIRLINES, INC. Operator named in NTSB report
- Operated by (per NTSB report)
- United Airlines
Probable cause
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.
Source: NTSB case DCA20LA047Flight crew
Certification and experience as recorded in the NTSB accident database for this event. The NTSB records these facts about the crew's flying history; GroundCheck shows them as filed, without names or identities.
| Role | Certificate | Instrument rating | Age | Medical | Flight hours |
|---|---|---|---|---|---|
| Pilot | Airline transport pilot | Airplane | 53 | Class 1 (2019-08-21) | 18,600 total · 1,053 in this make/model · 2,153 as PIC · 134 last 90 days |
| Co-pilot pilot flying | Airline transport pilot | Airplane | 50 | Class 1 (2019-09-05) | 10,500 total · 1,700 in this make/model · 5,500 as PIC · 180 last 90 days |
Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.