11.3 Nacelles And Pylons Construction Flashcards
what is the casing around an engine called?
engine nacelles
how does the arrangement of the engines influence the aircraft?
safety, structural weight, flutter ,drag ,control
how is the pylon constructed?
with a frame and skin structure
what materials is a pylon generally constructed from?
lightweight high strength materials such as aluminium alloys, titanium or composite materials
what is a pylon designed to do ?
withstand mechanical loads and vibrations during operation
what does the pylon box consist of ?
-torque box
-firewall and fireseal
-fairings
-strut drains
-fan cowl support beam
-engine attatchment fittings
how many areas is the torque box attached to ?
3
(2 forward pylon attachment fittings
1 aft pylon attachment fitting)
what fittings attach the forward wing spars to the pylon?
twin link fittings
what fittings attach the aft wing spar to the pylon?
a pair of shackles
what is the purpose of the engine nacelle?
to streamline and protect the engines
how is the framework of a nacelle made?
in a fuseage type network
what else can modern engine nacelles do that previous couldn’t?
modern often feature noise-reducing technologies such as acoustic lining and serrated edges
what is a fan cowl support beam and where is it attached ?
supports the fan cowling and distributes different loads through the beam to the torque box
attatched to both ends of the torque box
what is attatched to reduce the aerodynamic effects of the fittings from the engine nacelle and the wing?
wing to nacelle fairings
what are fan cowlings manufactured from?
graphite-epoxy structures
