Monday, July 27, 2020

Loss of Control on Ground: Yakovlev (Aerostar) Yak-52W, N52KF; accident occurred September 23, 2017 at Gillespie Field Airport (KSEE), El Cajon, San Diego County, California

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; San Diego, California

Aviation Accident Factual Report - National Transportation Safety Board:

Investigation Docket - National Transportation Safety Board:

Location: El Cajon, CA
Accident Number: WPR17LA214
Date & Time: 09/23/2017, 1415 PDT
Registration: N52KF
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Personal 

On September 23, 2017, about 1415 Pacific daylight time, an experimental SC Aerostar SA, Yak-52W airplane, N52KF, sustained substantial damage while taxiing at Gillespie Field Airport (SEE), El Cajon, California. The airline transport pilot and the passenger were not injured. The airplane was registered to an individual and operated by the pilot as a Title 14 Code of Federal Regulations Part 91 personal flight. Visual meteorological conditions prevailed, and no flight plan had been filed.

The pilot did not submit an NTSB Pilot/Operator Aircraft Accident/Incident Report Form 6120.1, however, his legal counsel provided an email statement which described the sequence of events.

The pilot reported that he conducted a normal preflight inspection, completed the starting engine checklist, and attempted to start the engine, but was unable to do so due to low pressure in the pneumatic system. An individual arrived with a tank of air to pressurize the system, while the pilot remained in the airplane. The pilot shut off the compressed air supply valve, as required during a pneumatic system recharge. The individual with the tank of air realized that they had accidentally brought the wrong adapter for the airplane, and left to find the correct adapter. A second individual arrived and offered to assist to start the engine by manually turning the propeller. The pilot accepted the offer, and the engine was subsequently started.

The pilot completed the post-start checklist, and started to taxi. Shortly thereafter, he experienced a loss of braking performance which affected the airplane's steering capabilities (the steering is accomplished through differential braking, and the brake system requires pneumatic pressure to operate). The pilot realized that the compressed air supply valve was still shut off, and attempted to turn it back on while turning the engine off and maintaining steering control. Due to the size constraints of the cockpit, he could not reach the supply valve without unstrapping his seat belt and turning around. The airplane impacted a fence before he was able to do so, and sustained substantial damage to the left wing.

Further investigation revealed that the Yak-52 checklist does not require the pilot to check air pressure or the valve position during the preflight, engine start or before takeoff phases.

There was no preimpact mechanical malfunction that would have precluded normal operations. 

Pilot Information

Certificate: Airline Transport; Flight Instructor; Flight Engineer
Age: 59, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Unknown
Other Aircraft Rating(s): Glider
Restraint Used:
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): Airplane Single-engine
Toxicology Performed: No
Medical Certification: Class 1 Without Waivers/Limitations
Last FAA Medical Exam:04/10/2017 
Occupational Pilot: Yes
Last Flight Review or Equivalent:
Flight Time:

Aircraft and Owner/Operator Information

Aircraft Make: SC AEROSTAR SA
Registration: N52KF
Model/Series: YAK 52W NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 1991
Amateur Built: Yes
Airworthiness Certificate:
Serial Number: 9111213
Landing Gear Type: Tricycle
Date/Type of Last Inspection:
Certified Max Gross Wt.: 2899 lbs
Time Since Last Inspection:
Engines: 1
Airframe Total Time:
Engine Manufacturer: AMA/EXPR
Engine Model/Series: UNKNOWN ENG
Registered Owner: FROST KEITH A
Rated Power:
Operator: On file
Operating Certificate(s) Held:None  

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KSEE, 387 ft msl
Distance from Accident Site: 0 Nautical Miles
Observation Time: 1447 PDT
Direction from Accident Site: 255°
Lowest Cloud Condition: Scattered / 5000 ft agl
Visibility:  10 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: 8 knots /
Turbulence Type Forecast/Actual:
Wind Direction: 230°
Turbulence Severity Forecast/Actual:
Altimeter Setting: 29.84 inches Hg
Temperature/Dew Point: 22°C / 11°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: El Cajon, CA (SEE)
Type of Flight Plan Filed: None
Destination: El Cajon, CA (SEE)
Type of Clearance: None
Departure Time: 1415 PDT
Type of Airspace:

Airport Information

Runway Surface Type: Asphalt
Airport Elevation: 387 ft
Runway Surface Condition: Dry
Runway Used: N/A
IFR Approach: None
Runway Length/Width:
VFR Approach/Landing: None

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion:None 
Total Injuries:2 None 
Latitude, Longitude: 32.826111, -116.972500

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