The accessory equipment and peripheral devices of engines take up a surprisingly large portion of the engine. They are extremely important for the engine in terms of cost and safety (Ill. 11.2.5-1.2). Accessory equipment is understood to be the components and respective infrastructure that are directly fastened to the engine and belong to it. The peripheral devices are all those that connect the engine with the nacelle, and are considered part of the nacelle (e.g. signal lines, nacelle-side fuel supply systems, fire warning systems).

Typical accessory equipment and peripheral devices (Figs. "Power gearbox with accessory components" and "Problems of accessory equipments"):

• Transmission (Figs. "Problems of auxilary gearboxes" and "Fatigue at light metal gearbox housings")
• Regulator (mechanical/hydraulic/electronic)
• Air, fuel, hydraulic systems:
  • Pumps
  • Oil tanks (Ill. 11.2.5-5)
  • Filters
  • Pipes (Volume 2, Ill. 9.3-2, and Chapter 9.2)
  • Deaerators
• Generators and starters
• Cables
  • Electrical (e.g. signal, power supply)
  • Mechanical (e.g. actuation and checkback, synchronization)
• Fasteners (e.g. lugs, clamps, dampers, connecting rods)
• External sensors (e.g. acceleration sensors, fire warning)
• Actuators (e.g. power for engine nozzle and thrust reverser)
• External containment (e.g. aramdid bandage)

As one can see, there are many very different components that must tolerate the various engine-specific loads, and function with a high degree of reliability (Fig. "Fastening of accessory equipment").