Cessna 210 N9540T

Summary

On 26 August 2020 at about 15:20 local time, a Cessna 210 registered N9540T was involved in an accident near Chino, 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.

Date

26 August 2020 at 15:20

Classification

Accident

Location

Chino, California, United States

Nearest airport

Chino (CNO)

Coordinates

33.9747, -117.6364

Aircraft

Cessna 210

Registration

N9540T

Category

Airplane

Year built

1960

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Chino → Chino

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

WPR20LA288

Nobody was injured.

The failure of the engine-driven hydraulic pump, which resulted in the main landing gear not fully extending and locking into place during landing. Contributing to the accident was the failure of the emergency gear extension system for reasons that could not be determined.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The pilot reported that the accident flight was the first flight since the airplane had undergone recent landing gear maintenance. While in the airport traffic pattern, he extended the landing gear; however, he noticed that it would not lock into the down position. Despite multiple attempts to cycle the landing gear, which included using the emergency landing gear extension procedure, he was unable to obtain a positive down and locked indication. While landing, both main landing gear collapsed and the left wing and left horizontal stabilizer impacted the runway surface, which resulted in substantial damage to the left elevator and horizontal stabilizer. Postaccident examination of the airplane revealed that the engine-driven hydraulic pump was not operational. No mechanical damage was observed within the engine’s accessory case. No evidence of any preexisting mechanical malfunction was observed with the airframe or emergency gear extension system. Examination of the engine-driven hydraulic pump revealed a torn section of an oil seal that surrounded the pump drive shaft. The oil seal was hard, brittle, and torn, which resulted in an oil leak that prevented the pump from holding pressure, which likely prevented the landing gear from fully extending and locking into place during landing. The reason for the emergency gear extension system not functioning could not be determined.

Quoted verbatim from the NTSB record.