Metallized Carbon (Metcar), a manufacturer of oil-free, self-lubricating, carbon-graphite materials for severe-service lubrication applications, has announced its carbon-graphite bushings are available for use in gear pumps that pump aviation fuel for aircraft engines. The carbon-graphite bushings, which are used to support both the drive gear shaft and the idler gear shaft, are preferred for that application because they can use aviation fuel as the bushing lubricant.
The FAA is publishing a new Airworthiness Directive (AD) for certain AgustaWestland AB139 and AW139 helicopters. It requires repetitive inspection of the main rotor (M/R) rotating scissors for play of the lower half scissor spherical bearing and removing the bearing if there is play beyond allowable limits. It also requires removing all affected bearings. This AD is prompted by reports of certain bearings dislodging from certain M/R rotating scissors.
The National Institute for Aviation Research (NIAR) at Wichita State University is offering a new oil analysis service for all types of piston and turbine engines. NIAR’s new oil analysis lab can perform trivector analysis (wear, contamination, general oil chemistry); infrared spectroscopy (monitors molecular substance in oil); particle count/shape recognition; elemental analysis (checking for elements that correlate to contaminants, wear metals and additives); and viscosity testing.
The FAA has granted PMA approval to Mesa, Ariz.-based Able Aerospace to provide low-cost replacements of Bell 206 duplex bearings (OEM p/n 206-040-032-105; Able p/n 2AA-040-032-105). The company offers certified, guaranteed parts that erase long lead-times and significantly reduce operating costs immediately, said Anthony Saenz, Able Aerospace’s president.
Loss of lubrication to the main gearbox (MGB) has been responsible for several crashes, ditchings and precautionary landings in large transport category helicopters in recent years. These accidents set off broad debate as to exactly what is required of main gearboxes under Part 29 certification of the U.S.
Duncan Aviation technicians can now provide faster landing-gear inspections, restorations and overhauls by using a new digital Fryer Touch 2100 Control machining mill. It allows technicians to machine landing-gear castings and other large parts with better accuracy and efficiency. Duncan Aviation completes landing-gear restorations and overhauls for Challengers, Hawkers, Learjets and King Airs, both in conjunction with in-house airframe inspections and for units that are removed and sent in for service.