Safety Recommendation describing AS350 B2 and earlier design for fuel flow cutoff lever
National Transportation Safety Board (letter recommendation to Federal Aviation Administration)
2010-10-20
<a rel="nofollow" class="external free" href="https://www.ntsb.gov/safety/safety-recs/recletters/A-10-129-130.pdf">https://www.ntsb.gov/safety/safety-recs/recletters/A-10-129-130.pdf</a>