Pilot Debrief

JMMT LLC VANS RV9A near Jasper, GA — 2024-03-29

Final reportERA24LA158
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Date
2024-03-29
Location
Jasper, GA, USA
Airport
JZP
Aircraft
JMMT LLC VANS RV9A
Registration
N387E
Category
Airplane
Highest injury
Serious
Fatalities
0
Phase of flight
Descent

Probable cause

The total loss of engine power due to fuel starvation for reasons that could not be determined due to impact-related damage.

NTSB narrative

The purpose of the flight was for the private pilot/builder of the experimental amateur-built airplane to complete the second flight of the phase one flight testing. The pilot planned to remain near the airport and obtain engine performance data. The pilot reported that after a normal takeoff, he maneuvered in the area and observed normal engine performance, and he then descended to return to the airport traffic pattern. The pilot reported that while approaching a left downwind for landing, he observed the engine rpm decline and the Electronic Flight Instrument System (EFIS) timer announced, “change fuel tank.” The pilot engaged the fuel boost pump and switched from the left to right fuel tank, which was followed by a complete loss of engine power. The pilot elected to land in a field, and during the landing roll, the left wing struck a utility pole. The fuselage and left wing sustained substantial damage. Examination of the engine found no evidence of preimpact mechanical malfunction or failure that would have precluded normal operation and fuel was found in the right tank after the accident. During examination of the fuel system and selector, the right tank fuel line b-nut exhibited low torque, which could have resulted in a total loss of power due to fuel starvation. Although it is possible that the loose B-nut at the fuel selector allowed air into the fuel line when the pilot switched to the right fuel tank, due to the impact damage sustained to other areas of the fuel lines, and lack of recorded data from the multifunction display, the reason for the fuel starvation could not be determined.

Analysis

Primary failure mode
Fuel management
First missed decision gate
Pilot could have checked fuel levels before switching tanks.

NTSB coding

Evidence available

  • Photos
  • 6 docket documents
View NTSB final reportView NTSB docket

Docket documents6

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