Probable cause
A failure of a spring in the main landing gear actuation system that prevented the landing gear from extending.
NTSB analysis
The pilot executed a wheel-up landing after normal and emergency extension procedures failed to properly lower the airplane's landing gear. The airplane sustained damage to the propeller, lower fuselage skins, and fuselage bulkheads. Postaccident retraction tests revealed that the landing gear extended and retracted abnormally. Examination of the landing gear system revealed a deformed spring on the uplock sequencing actuator. The spring was replaced and subsequent retraction tests were normal. Review of the hydraulic system for the airplane revealed that a failure of the uplock sequencing actuator could result in hydraulic pressure being directed to both sides of the main landing gear actuators, causing the landing gear to not fully extend. No other preexisting anomalies were found.
Text from the NTSB. Open the NTSB docket for CEN11CA640 for the full record.
Event
- Date
- Aug 25, 2011
- Type
- Accident
- Place
- Cahokia, Illinois
- Nearest airport
- St Louis Downtown Airport (CPS)
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Cessna T210M
- N-number
- N44HR
- Category
- Airplane
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Personal
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.