When necessary to properly evaluate engine
performance or when icing conditions exist,
inlet duct runup screens should be removed.
Runup with screens removed shall be made in
a designated, thoroughly cleaned area.
Inlet duct runup screens shall not be
installed and removed with engine
operating above Idle rpm Loose
Items of clothing shall not be worn
and objects which might be drawn
into the Intake ducts shall not be
carried when installing or removing
screens. Damage to the engine may
Inlet duct runup screens may be
left off during taxiing to and from
conditions make the use of
specific conditions warranting
removal of screens as specified
above cannot be predetermined,
determined by each command as
operation Approval of screen
additional precautions necessary
j. Use only nonmetallic-head hammers when
required to install parts on engine.
k. When possible, use appropriate hoist or lifting yoke
on heavy or bulky parts, such as tailpipes.
I. Tighten jack screws, attaching screws, bolts, and
nuts In small increments on opposite planes.
Lead poisoning is an accumulative
disease that can be fatal. Preventive
rather than curative measures shall
m. A turbine engine that has operated on fuel
containing tetraethyl lead may have a yellow powder on
those sections that are exposed to combustion gases.
for example, tail pipes and combustion chambers.
Extreme care shall be used by all personnel handling
such parts to prevent internal contamination of the body
through open cuts, sores, or inhaling. Personnel shall
adhere to following precautionary measures.
Change clothes daily.
When possible, gloves shall be worn. Wash or
change gloves daily.
Hands shall be thoroughly washed before
eating, drinking, smoking, or using toilet.
Scrub body thoroughly each day.
8-5. Turbine Engine Design and Construction. A
section, exhaust section, accessory section, and the
necessary systems for starting, lubrication, fuel supply,
and auxiliary purposes, such as anti-icing, cooling, and
pressurization. The major components of all turbine
nomenclature of the component parts of various engines
currently In use will vary slightly due to the difference In
manufacturer terminology. These differences are
reflected in the applicable maintenance manuals.
a. Inlet Ducts. There are two basic types of inlet
ducts, the single entrance and the divided entrance
duct. Single entrance inlet ducts are used with axial-
flow engines, as shown in figure 8-3, to obtain maximum
ram pressure through straight flow. Divided entrance
inlet ducts, as shown in figure 8-4, provide the
opportunity to diffuse the incoming air so It enters the
plenum chamber with the low velocity required to utilize
a centrifugal-flow engine inlet ducts may be classified
Nose Inlets, located in the nose of the
fuselage or powerplant pod or nacelle.
Wing inlets, located along the leading edge of
the wing, usually at the root for single-engine
Annular inlets, encircling, In whole or in part,
the fuselage or powerplant pod or nacelle.
Scoop inlets, which project beyond the
immediate surface of the fuselage or nacelle.
Flush Inlets, which are recessed in the side of
the fuselage, powerplant pod, or nacelle.