engines will eat anything and they have no respect
for life or limb. This hazard is greatest during
maximum power settings (high-power turnup).
The air inlet duct may develop enough suction to
pull hats, eyeglasses, loose clothing, and rags from
pockets. Secure or remove all loose articles before
working around operating jet engines. In some
engines, the suction is strong enough to pull a person
up to or, in some cases, into the inlet and pull the
eyeballs from their sockets. Keep clear of the intakes.
Protective screens (fig. 5-12) are supplied as part
of the ground handling equipment for most jet aircraft.
These screens should be installed before all
maintenance turnup. Turnup screens protect both
personnel and engines. It does NOT eliminate the need
for caution; serious injury can still result by being
Figure 5-12.Engine inlet protective screen.