ASN Wikibase Occurrence # 171912
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| Date: | Thursday 4 December 2014 |
| Time: | 11:00 |
| Type: |  Cessna 210-5 (205) |
| Owner/operator: | Private |
| Registration: | N8296Z |
| MSN: | 205-0296 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 7870 hours |
| Engine model: | Continental IO-470-S |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | West of Sussex Airport (KFWN), Sussex, NJ -
 United States of America
|
| Phase: | Take off |
| Nature: | Parachuting |
| Departure airport: | Sussex, NJ (FWN) |
| Sussex, NJ (FWN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, shortly after the skydiving flight departed, the engine experienced a “mechanical failure” and that he then executed a forced landing in a farm field south of the airport. The airplane nosed over in the mud, which resulted in structural damage to the airframe.
During a postaccident test run of the engine on the airframe, lower-than-normal exhaust gas temperature indications were observed on the engine’s left-side (Nos. 2, 4, and 6) cylinders. Excessive soot and smoke were also observed on the engine’s left side. During a subsequent test run, the engine initially did not achieve full power. Further examination revealed that both of the No. 2 cylinder intake valve springs were fractured, and visible rust was observed on the surfaces of the springs. The springs showed evidence of fatigue fractures that had originated from rust pits on the fracture surfaces. After the valve springs were replaced, the engine was capable of operating normally at full power.
An annual inspection was completed on the engine less than 2 months (13 engine operating hours) before the accident. As part of the annual inspection, the engine manufacturer’s operating manual required the removal of the cylinder rocker covers and inspection of the valve area for breakage and proper lubrication. It is likely that maintenance personnel did not adequately inspect the No. 2 cylinder valve area during the annual inspection, which allowed the rust to go undetected and resulted in the in-flight failure of the No. 2 cylinder valve springs.
Probable Cause: Maintenance personnel’s inadequate inspection of the No. 2 cylinder valve area during the most recent annual inspection, which resulted in the in-flight failure of the intake valve springs due to rust on the spring surfaces and subsequent fatigue cracking.
Accident investigation:
 |
|
Sources:
NTSB
https://flightaware.com/resources/registration/N8296Z
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Dec-2014 19:03 | Geno | Added |
| 05-Dec-2014 19:13 | Geno | Updated [Phase, Source] |
| 10-Jan-2015 00:13 | Geno | Updated [Source, Damage, Narrative] |
| 05-Dec-2015 17:44 | hexatus | Updated [Embed code] |
| 07-Dec-2015 13:33 | Aerossurance | Updated [Source] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 30-Nov-2017 19:43 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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