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Brake pads should be checked at least every 5,000 miles for excessive or uneven wear. Although brake pad wear is unique to each vehicle, it is generally recommended that brake pads be replaced every 50,000 miles, [6] while brake discs (or rotors) typically last longer, needing replacement every 70,000 miles.
The Bell V-280 Valor is a tiltrotor aircraft being developed by Bell Helicopter for the United States Army's Future Vertical Lift (FVL) program. [2] The aircraft was officially unveiled at the 2013 Army Aviation Association of America's (AAAA) Annual Professional Forum and Exposition in Fort Worth, Texas.
The average cost per flight hour is US$9,156, [72] whereas the Sikorsky CH-53E Super Stallion cost about $20,000 (~$28,320 in 2023) per flight hour in 2007. [73] V-22 ownership cost was $83,000 per hour in 2013. [74] In 2022, the Pentagon evaluated its cost per flight hour at $23,941. [75] A CMV-22B lands on USS Nimitz (CVN-68) in March 2022.
The QTR is a larger, four rotor version of the V-22 with two tandem wings sets of fixed wings and four tilting rotors. In January 2013, the FAA defined US tiltrotor noise rules to comply with ICAO rules. A noise certification will cost $588,000, same as for a large helicopter. [15] [16]
The Bell D-292 used the Avco Lycoming engines, transmission, two-bladed main and tail rotors, tailboom, vertical fin, and rotor pylon of the 222. The D-292 had a new composite airframe. Bell 230 In 1991, the 222B design was updated, given more uprated engines, and renamed the Bell 230. Production ended in 1995. Bell 230 Executive
In September 2005, Bell and Boeing received a cost-sharing contract worth US$3.45 million from the U.S. Army's Aviation Applied Technology Directorate for an 18-month conceptual design and analysis study lasting through March 2007, in conjunction with the Joint Heavy Lift program.
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