Williams Yakovlev YAK 3UPW N153U
22 March 2010 · Half Moon Bay, California, United States · No injuries
Summary
On 22 March 2010 at about 21:30 local time, a Williams Yakovlev YAK 3UPW registered N153U, operated by James A Williams, was involved in an accident near Half Moon Bay, California, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 21:30
- Classification
- Accident
- Location
- Half Moon Bay, California, United States
- Nearest airport
- Half Moon Bay (HAF)
- Coordinates
- 37.5136, -122.5011
- Aircraft
- Williams Yakovlev YAK 3UPW
- Registration
- N153U
- Category
- Airplane
- Engines
- 1
- Operator
- James A Williams
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Half Moon Bay → Half Moon Bay
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- WPR10LA173
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
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.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
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.
Quoted verbatim from the NTSB record.
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 13 Jun 2010 | Grumman Acft Eng Cor-Schweizer G-164B | Courtland, California, United States | Walter Avery | Serious injuries | - |
| 7 Mar 2010 | Cessna 172P | Camarillo Airport, California, United States | Channel Islands Aviation Inc | No injuries | - |
| 27 Apr 2010 | Piper PA-30 | Merced, California, United States | - | Fatal | 1 |
| 12 Oct 2010 | Robinson R22 BETA | Long Beach, California, United States | Temco Sky Networks | Serious injuries | - |
| 15 Jun 2010 | Rans COYOTE II S6 | Lincoln, California, United States | Michael S. Gorden | Fatal | 2 |
| 12 Oct 2010 | Boeing A75N1(PT17) | Palm Springs, California, United States | Kent Thomas | No injuries | - |