- Date
- August 25, 2011, 17:31 local (22:31 UTC)
- Place
- Cahokia, IL
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N44HRCessna T210M
- Defining event
- Landing: Sys/Comp malf/fail (non-power)
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 29, 2011
- Report
- Approved by Office Director
- NTSB office
- Central Region
- Parties
- FAA - St Louis FSDO
- FAA report
- 20110825020779A
- Case key
- 81781
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
A failure of a spring in the main landing gear actuation system that prevented the landing gear from extending.
Findings · 1
NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.
Sequence of events
The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.
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.
Factual narrative
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 up lock 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 up lock 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.
Aircraft
- Registration
- N44HR
- Reported as
- Cessna T210M
- Category
- Airplane
- Serial number
- 21062685
- Airframe hours
- 5,628
- Engine
- Cont Motor TSIO-520-R, 310 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Airworthiness certificate
- Special, Restricted (Special); Standard, Normal
- Last inspection
- Annual · August 23, 2010
- Departed
- CPS · Cahokia, IL
- Destination
- CPS · Cahokia, IL
- Airport
- CPS · St Louis Downtown Airport, runway 12L, 5,300 × 75 ft, concrete
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 44
- Injuries
- None
- Certificates
- Airline transport, Flight engineer, Commercial, Flight instructor
- Airplane ratings
- Single-engine land, Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Without waivers/limitations
- Last flight review
- December 22, 2010
- Seat
- Left
- Flight hours
- 18,526 total · 140 in this make and model · 14,793 as pilot in command · 273 in the last 90 days · 116 in the last 30 days · 4 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 10° at 7 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 79 °F, dew point 55 °F
- Altimeter
- 30.01 inHg
- Observed at
- CPS
Docket · 3
The files NTSB released with the investigation on October 21, 2011, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.1 MB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.