ASN Wikibase Occurrence # 286002
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| Date: | Thursday 5 June 2008 |
| Time: | 06:07 LT |
| Type: |  Beechcraft 58 Baron |
| Owner/operator: | Jim Hankins Air Service, Inc. |
| Registration: | N3106W |
| MSN: | TH-408 |
| Year of manufacture: | 1973 |
| Total airframe hrs: | 10013 hours |
| Engine model: | Continental IO-520-C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Jackson, Mississippi -
 United States of America
|
| Phase: | Take off |
| Nature: | Ferry/positioning |
| Departure airport: | Jackson-Hawkins Field, MS (HKS/KHKS) |
| Pensacola Regional Airport, FL (PNS/KPNS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, during the takeoff roll and while traveling at about 50 knots, he heard an "explosion" and could feel a thud in the rudder pedals. He immediately looked up and saw damage on the left wing with black smoke coming out of a hole in the wing. The pilot stopped the airplane, exited and put out the fire with an onboard fire extinguisher. Examination of the airplane found a thermally damaged hose (vent line), which contained a tight hose clamp and crimped end within the clamp. The separated hose was found lying below the siphon break-bent line interconnect. The position of the clamped and crimped end was consistent with the hose being clamped prior to the break-bent line, which would have allowed the partially connected hose to separate from the break-bent line. The separation of the hose from the break-bent line interconnect would have allowed fuel vapor to accumulate within the wing's open cavities. Additionally, the landing light power wire was separated and the exposed end of the wire exhibited melting, and there was evidence of arcing that existed along the base of the structure (lighting hole) and adjacent interior upper wing skin. This arcing was likely the ignition source for the trapped fuel vapor. The outboard leading edge fuel cell was removed during the investigation and checked for leaks. The fuel cell was pressurized and an air leak was found on the aft side of the fuel cap assembly, at the interior fuel placard mounting rivets. The fuel full placard and rivets were found to be loose when moved by hand. The loose mounting rivets would have also been a source of fuel vapor, which would have contributed to the fuel vapors trapped in the wing. The left wing fuel cells were replaced about 13 months prior to the accident and the airplane's most recent 100-hour inspection was performed about 3 months prior to the accident. For 100-hour inspections, the airplane's maintenance manual contained instructions to examine fuel cells, vent lines, and electrical wiring.
Probable Cause: An outboard left wing explosion during takeoff due to the improper fuel cell installation and inadequate subsequent inspections by maintenance personnel.
Accident investigation:
 |
|
Sources:
NTSB MIA08FA114
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Oct-2022 18:19 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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