ASN Wikibase Occurrence # 73561
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| Date: | Monday 22 March 2010 |
| Time: | 14:30 |
| Type: |  Yakovlev Yak-3U PW |
| Owner/operator: | private |
| Registration: | N153U |
| MSN: | 005 |
| Total airframe hrs: | 21 hours |
| Engine model: | Pratt & Whitney R-1830 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Half Moon Bay Airport, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Half Moon Bay, CA (HAF) |
| Half Moon Bay, CA (HAF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Prior to landing the pilot observed 3 green lights indicating that the landing gear was down and locked. During the landing roll the left main landing gear collapsed, which resulted in substantial damage to the left wing and aileron. A Federal Aviation Administration inspector reported that a postaccident examination of the left main landing gear's pneumatic actuator revealed that the actuator's down-lock ball track was contaminated with dirt and that the steel down-lock balls were corroded. The combination of dirt in the actuator's down-lock track, the corroded down-lock balls, and the low down-lock pressure likely caused the gear to collapse.
Probable Cause: The failure of left main landing gear actuator to lock in the down position due to low down-lock pressure as a result of a contaminated down-lock track and corroded down-lock balls.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Mar-2010 22:05 | Digitalis | Added |
| 22-Mar-2010 23:17 | slowkid | Updated [Cn, Location, Departure airport, Source, Damage] |
| 23-Mar-2010 21:25 | RobertMB | Updated [Operator, Source, Damage] |
| 09-Mar-2011 17:30 | TB | Updated [Aircraft type, Operator, Location, Departure airport, Destination airport, Source] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 26-Nov-2017 15:55 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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