Trends in U.S. Air Force Aircraft Mishap Rates (1950–2018)

Abstract

T he U.S. Air Force's aircraft inventory is old and getting older. Aircraft, such as the B-52 and KC-135, were designed and manufactured more than 60 years ago but remain critical elements of the Air Force's force structure. At the same time, newer aircraft, such as the F-22 and RQ-4, rely on more-complex technologies, materials, and software, potentially creating new operational and sustainment challenges. The aging of certain fleets and increasing complexity of newer military aircraft, coupled with continued overseas operations and a fluctuating budget environment, have led some to worry that the Air Force's inventory is likely to be more prone to incidents that result in a loss of aircraft or, worse, life.These concerns were elevated following a March 15, 2018, HH-60 loss in Iraq that resulted in seven fatalities and a May 2, 2018, WC-130 loss in Savannah, Georgia, that resulted in nine fatalities and contributed to Congress establishing the National Commission on Military Aviation Safety as part of the 2019 National Defense Authorization Act. 1 To investigate concerns over mishaps and support the commission, we assembled and analyzed mishap data from the Air Force Safety Center for 55 different aircraft types in operation since 1950. 2 A mishap is an "unplanned event or series of events resulting in death, injury, occupational illness, or damage to or loss of equipment or property, or damage to the environment." 3 Our analysis focuses on three types of mishap events, defined as follows: 4

Marine-cloud brightening: an alternative system

“…• Lower robustness, due to to a higher centralization and potential points of failure • More difficult to operate: UAVs can be difficult to operate in harsh weather conditions, while unmanned ships are comparatively easier to operate. The crash rate for the MQ-9 has been approximately 1.8 per 100,000 flight hours (Light et al, 2020). Given these statistics, and with 8.7•10 6 flight hours per year, an average of 140 crashes per year would be expected, which is very high.…”

Marine-cloud brightening: an airborne concept

“…(iii) The MQ-9 has approximately 1.8 crashes per 10 5 flight hours [43]. With 4.38 • 10 6 flight hours annually, 80 crashes per year would be expected-representing substantial fleet attrition, comparable to airframe retirements (45 retirements per year).…”

Marine Cloud Brightening: an airborne concept

“…• The MQ-9 has approximately 1.8 crashes per 10 5 flight hours [27]. With 4.38 • 10 6 flight hours annually, 80 crashes per year would be expected -representing substantial fleet attrition, comparable to airframe retirements (45 retirements per year).…”