Monday, January 14, 2019

Yakovlev (Aerostar) YAK-52, N624PT: Accident occurred February 01, 2017 at St. Elmo Airport (2R5), Mobile County, Alabama

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

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; Birmingham, Alabama

Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

http://registry.faa.gov/N624PT

Location:  St. Elmo, AL
Accident Number: ERA17LA105
Date & Time: 02/01/2017, 1715 CST
Registration: N624PT
Aircraft: S C AEROSTAR S A YAK 52
Aircraft Damage: Substantial
Defining Event: Sys/Comp malf/fail (non-power)
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal 

On February 1, 2017, about 1715 central standard time, an experimental S C Aerostar S A Yak-52, N624PT, was substantially damaged while landing at St. Elmo Airport (2R5), St. Elmo, Alabama. The private pilot was not injured. The airplane was operated by the private pilot as a personal flight conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan was filed for the local flight that originated from 2R5 about 1700.

The pilot reported that the landing gear was a pneumatic system. Shortly after takeoff and retracting the landing gear, he noticed that the pneumatic pressure was low. He then attempted to extend the landing gear using normal and emergency procedures, but the right main landing gear remained retracted. The pilot subsequently performed an emergency landing with the right main landing gear retracted. During the landing roll, he was able to keep the right wing from contacting the runway for about 1,000 feet. Once it contacted the runway, the pilot was unable to maintain directional control and the airplane came to rest upright in a grass area off the right side of the runway.

The airplane was manufactured in the former Soviet Union in 1985, imported to the U.S. in 2003 and issued an FAA experimental airworthiness certificate. Some of the maintenance records did not import and the total time on the airframe could not be determined. The airplane's most recent annual condition inspection was completed on October 1, 2016. At that time, the engine had accumulated about 504 hours since overhaul. The airplane had been operated for 18 hours from the time of that inspection, until the accident.

Examination of the airplane by a Federal Aviation Administration (FAA) inspector revealed substantial damage to the right aileron. The inspector and a local mechanic also noted that the pneumatic cylinder actuator (P/N 524705-30) that released the right main landing gear uplock was not functioning properly. The mechanic subsequently performed a teardown examination of the actuator, which revealed that moisture had entered the actuator and corroded the internal components. The mechanic further stated that he planned to install a dryer system on the compressor of the airplane to prevent moisture from accumulating in the pneumatic lines. He also planned to subsequently disassemble and inspect the landing gear actuators every 2 or 3 years for corrosion. An organization of the make and model airplane owners were alerted regarding the issue found with the landing gear actuator.

Pilot Information

Certificate: Private
Age: 55, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s): None
Restraint Used: 5-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 With Waivers/Limitations
Last FAA Medical Exam: 08/11/2015
Occupational Pilot: No
Last Flight Review or Equivalent: 08/05/2016
Flight Time:  545 hours (Total, all aircraft), 192 hours (Total, this make and model), 455 hours (Pilot In Command, all aircraft), 4 hours (Last 90 days, all aircraft), 4 hours (Last 30 days, all aircraft), 1 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: S C AEROSTAR S A
Registration: N624PT
Model/Series: YAK 52 NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 1985
Amateur Built: No
Airworthiness Certificate: Experimental
Serial Number: 855812
Landing Gear Type: Retractable - Tricycle
Seats: 2
Date/Type of Last Inspection: 10/01/2016, Condition
Certified Max Gross Wt.: 2877 lbs
Time Since Last Inspection: 18 Hours
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Vendenyev
ELT: C91  installed, not activated
Engine Model/Series: M14P
Registered Owner: REDSTAR AVIATORS LLC
Rated Power: 360 hp
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: MOB, 218 ft msl
Distance from Accident Site: 12 Nautical Miles
Observation Time: 1656 CST
Direction from Accident Site: 5°
Lowest Cloud Condition: Few / 4100 ft agl
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 8 knots /
Turbulence Type Forecast/Actual: / None
Wind Direction: 200°
Turbulence Severity Forecast/Actual: / N/A
Altimeter Setting: 30.12 inches Hg
Temperature/Dew Point:  21°C / 11°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: St. Elmo, AL (2R5)
Type of Flight Plan Filed: None
Destination: St. Elmo, AL (2R5)
Type of Clearance: None
Departure Time: 1700 CST
Type of Airspace: 

Airport Information

Airport: St. Elmo Airport (2R5)
Runway Surface Type: Asphalt
Airport Elevation: 132 ft
Runway Surface Condition: Dry
Runway Used: 24
IFR Approach: None
Runway Length/Width: 3998 ft / 80 ft
VFR Approach/Landing: Full Stop; Traffic Pattern

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None

Latitude, Longitude: 30.501944, -88.275000 (est)

NTSB Identification: ERA17LA105
14 CFR Part 91: General Aviation
Accident occurred Wednesday, February 01, 2017 in St. Elmo, AL
Aircraft: S C AEROSTAR S A YAK 52, registration: N624PT
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On February 1, 2017, about 1715 central standard time, an experimental S C Aerostar S A Yak-52, N624PT, was substantially damaged while landing at St. Elmo Airport (2R5), St. Elmo, Alabama. The private pilot was not injured. The airplane was operated by the private pilot as a personal flight conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan was filed for the local flight that originated from 2R5 about 1700.

The pilot reported that the landing gear was a pneumatic system. Shortly after takeoff and retracting the landing gear, he noticed that the pneumatic pressure was low. He then attempted to extend the landing gear using normal and emergency procedures, but the right main landing gear remained retracted. The pilot subsequently performed an emergency landing with the right main landing gear retracted. During the landing roll, he was able to keep the right wing from contacting the runway for about 1,000 feet. Once it contacted the runway, the pilot was unable to maintain directional control and the airplane came to rest upright in a grass area off the right side of the runway.

Examination of the airplane by a Federal Aviation Administration (FAA) inspector revealed substantial damage to the right aileron. The inspector and a local mechanic also noted that the pneumatic cylinder (P/N 524705-30) that released the right main landing gear uplock was not functioning properly. The mechanic planned to perform a teardown examination of the cylinder.


The airplane was manufactured in the former Soviet Union in 1985, imported to the U.S. in 2003 and issued an FAA experimental airworthiness certificate. Some of the maintenance records did not import and the total time on the airframe could not be determined. The airplane's most recent annual condition inspection was completed on October 1, 2016. At that time, the engine had accumulated about 504 hours since overhaul. The airplane had been operated for 18 hours from the time of that inspection, until the accident.

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