Relatório do Acidente ocorrido no Incêndio Florestal de Yarnel Hill

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7. In the vicinity of the deployment site, the fire front travelled an estimated 100 yards in 19 seconds. Winds modeled in excess of 50 miles-per-hour pushed a flaming front that was very deep and turbulent. Flame lengths, estimated at 70 feet, tilted to near horizontal as the fire moved through the deployment site. Several observations point to extremely high temperatures and radiant and convective heat exposure with extremely high heat flux (rate of energy transfer). Observations include: 1. The fire’s consumption of the heavy brush surrounding the deployment site left very little in the way of blackened stobs of brush. 2. Thermal breakdown of the high temperature-resistant materials used in the fire shelters. 3. No evident difference in fire exposure between the front sides versus the lee sides of the fire shelters. 4. Only slight differences in flame and temperature exposure between the leading (northeast side) and the back side (southwest side) of the deployment site. The temperatures, heat flux, and the radiant and convective heat of this burnover appear to have been well beyond the protective capabilities of the fire shelters and protective equipment. Figure 7. The box canyon opens to the northeast; the south end of Yarnell is visible in the distance. Yarnell Hill Fire Serious Accident Investigation 86
Temperatures: The table below lists temperature data corresponding to the various post-incident material conditions, as reported by manufacturers and independent testing. For human tenability, the National Research Council of Canada (NRCC) fire tests indicate that 300 o F is the maximum survivable breathing air temperature, but only for short periods and in the absence of moisture. Material Temperature Silica cloth – Brittle Estimated 2000 o F Quartz Thread – Brittle 2000 o F Fiberglass – Brittle 1350 to 1610 o F Aluminum Foil – Melt 1,220 o F Aramid Cloth – Char 824 o F Aramid Cloth– Stiff/Brittle 710 o F Glove Leather – Shrinkage 45% 600 o F Foil/Shelter Cloth Bond – Delamination 500 o F Aramid Cloth Dye – Sublimation (Discolored) 400 o F Glove Leather – Shrinkage 10% 350 o F Helmet Polycarbonate – Softens 325 o F Human Tenability 300 o F Yarnell Hill Fire Serious Accident Investigation 87
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Yarnell Hill Fire June 30, 2013 Ser
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Andrew Sterling Ashcraft Travis Cla
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Contents Executive Summary ........
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Executive Summary Nineteen firefigh
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included a doubling of fire intensi
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The Investigation Process Following
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Report Structure This report is in
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Figure 1. Land within the fire peri
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Part One: Factual & Management Repo
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The fire eventually jumps the two-t
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Sunday, 30 June 2013 At the 0700 br
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and State FMO, seeing that the comp
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Figure 6. Estimated fire perimeter
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with radios on the incident, noting
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Also, at about 1550, GM Lookout is
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idge one mile north of town. Resour
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with the stated intent of being bac
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traffic. He contacts ASM2 and assis
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hour after launching, they spot the
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Analysis There is a gap of over 30
Page 41 and 42: • Fire behavior observed by the G
Page 43 and 44: • Moving to Yarnell provides the
Page 45 and 46: • The fire was not below them. Th
Page 47 and 48: • They could not escape the box c
Page 49 and 50: • The Team found no indication th
Page 51 and 52: Part Two: Learning Discussion Discu
Page 53 and 54: Situational Awareness Wildland fire
Page 55 and 56: forecast or update is, the lower th
Page 57 and 58: • We found no indication that the
Page 59 and 60: One might view traveling through an
Page 61 and 62: Some Questions for Ground Crews and
Page 63 and 64: something they thought they heard.
Page 65 and 66: wildland and WUI focus to primarily
Page 67 and 68: Appendices Appendix A: Sequence of
Page 69 and 70: TIME EVENT June 30, 2013 ~0700 Brie
Page 71 and 72: Appendix B: Fire Environment & Beha
Page 73 and 74: Climate data indicates a non-typica
Page 75 and 76: directly affect the fire area altho
Page 77 and 78: At 1500 MST, the FAA radar showed a
Page 79 and 80: help detect trends in fire behavior
Page 81 and 82: Figure 16. A more pronounced outflo
Page 83 and 84: north to south affecting the fire a
Page 85 and 86: Figure 20. Wind vectors around the
Page 87 and 88: Figure 22. Yarnell Hill Fire Progre
Page 89 and 90: DISCUSSION Deployment Site Preparat
Page 91: Figure 6. The burned remnants of a
Page 95 and 96: Individual PPE Analysis: Eric Marsh
Page 97 and 98: 2. PPE Items: a. Clothing: Back of
Page 99 and 100: 3. Body position: The firefighter w
Page 101 and 102: John Percin, Jr., Granite Mountain
Page 103 and 104: that the SEATs each made two retard
Page 105 and 106: equested a second VLAT, an order SW
Page 107 and 108: Table 2. Resource Ordering Resource
Page 109 and 110: Flight Date ATKR Gallons Origin End
Page 111 and 112: Appendix E: Work/Rest & Qualificati
Page 113 and 114: Position Required Training FFT2 No
Page 115 and 116: WFLC Wildland Fire Leadership Counc
Page 117 and 118: Trigger Points: Geographic points o
Page 119 and 120: Appendix H: Team Members & Signatur
Page 121 and 122: Appendix I: Subject Matter Experts
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Relatório do Acidente ocorrido no Incêndio Florestal de Yarnel Hill

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