A cargo hook assembly for a helicopter is provided. The cargo hook assembly comprises a support structure having a forward end portion and a rearward end portion, and an attachment mechanism attached to the rearward end portion. The attachment mechanism is configured to engage a cargo hook mount on the underside of the fuselage of the helicopter. The cargo hook assembly further comprises first and second struts extending from respective opposing sides of the forward end portion. Each of the first and second struts is configured to engage a respective side mount on the fuselage of the helicopter. The cargo hook assembly also comprises a cargo hook suspended from the support structure.

In some examples, a drain pan comprises a composite material forming a reservoir and a drain. The composite material comprises a polymeric resin and a reinforcing fiber. The reservoir is to catch a liquid from an engine and to support a step load. The drain is to drain the liquid from the reservoir. In some examples, a method comprises attaching a drain pan to an aircraft proximate an engine. The drain pan comprises a composite material forming a reservoir and a drain. The method further comprises catching a liquid from the engine in the reservoir of the drain pan and draining the liquid from the reservoir through the drain. In addition, the method comprises supporting a step load on the reservoir of the drain pan.

A wind forecasting system configured to generate forecasted wind conditions for a time interval based on wind data derived from flight log data collected from a plurality of aerial vehicles operating in a first area. The forecasted wind conditions can be used by an aerial route management system to generate a flight plan for an aerial vehicle from a start location to an end location in the first area during the time interval.

A wind forecasting system configured to generate forecasted wind conditions for a time interval based on wind data derived from flight log data collected from a plurality of aerial vehicles operating in a first area. The forecasted wind conditions can be used by an aerial route management system to generate a flight plan for an aerial vehicle from a start location to an end location in the first area during the time interval.

A rotary wing aircraft with a fuselage that comprises an upper primary skin and an aircraft upper deck arranged above the fuselage, wherein the aircraft upper deck comprises a firewall arrangement that defines a fire proof separation at least between at least one aircraft engine and an aircraft interior region, wherein the firewall arrangement comprises at least one funnel-shaped lower firewall that is arranged between the at least one aircraft engine and the upper primary skin of the fuselage, wherein the at least one funnel-shaped lower firewall converges from an outer perimeter to at least one inner collecting point, and wherein the outer perimeter is spaced apart from the upper primary skin of the fuselage.

A rotary wing aircraft with a fuselage that comprises an upper primary skin and an aircraft upper deck arranged above the fuselage, wherein the aircraft upper deck comprises a firewall arrangement that defines a fire proof separation at least between at least one aircraft engine and an aircraft interior region, wherein the firewall arrangement comprises at least one funnel-shaped lower firewall that is arranged between the at least one aircraft engine and the upper primary skin of the fuselage, wherein the at least one funnel-shaped lower firewall converges from an outer perimeter to at least one inner collecting point, and wherein the outer perimeter is spaced apart from the upper primary skin of the fuselage.

In an embodiment, a method includes acquiring a current condition indicator of a condition indicator set associated with an operating condition of a machine, the condition indicator set indicating sensor readings associated with an operating element of the machine under the operating condition. The method also includes determining, by a data server, a relative trend significance over a trend window of the condition indicator set based, at least in part, on an evaluation of the trend window in relation to a historical window of the condition indicator set. The method also includes determining, by the data server, whether trend criteria associated with the operating element is satisfied, where the trend criteria may include criteria related to the relative trend significance. The method also includes executing, by the data server, an alerting process in response to the determining that the trend criteria is satisfied.

One embodiment includes a rotary aircraft, including: a main drive rotor; an aircraft body mechanically coupled to the main drive rotor; and first and second flight assist wings passively rotatably coupled to the aircraft body.

One embodiment includes a rotary aircraft, including: a main drive rotor; an aircraft body mechanically coupled to the main drive rotor; and first and second flight assist wings passively rotatably coupled to the aircraft body.

A removable aerial application system and a method of installing the removable aerial application system in an aircraft such as a helicopter. In one embodiment, a removable aerial application system for an aircraft comprises: a tank insertable into a cabin of the aircraft; a first delivery conduit and a second delivery conduit, the first and second delivery conduits being in communication with the tank and extending aftward beneath a fuselage of the aircraft, a first auger within the first delivery conduit and a second auger within the second delivery conduit; a collector assembly defining a chamber, each of the first and second delivery conduits being in communication with the chamber; a distribution system coupled to the collector assembly; and a hydraulic system in mechanical communication with each of the first and second augers.