Engine
 The increased horsepower T53-L-13 weighs
about 40 pounds more than the T53-L-11B. One
more gas producer turbine stage and one more

 s M. -


power turbine stage in the combustor section
accounts for most of the weight.
 With the added stages the turbine inlet tempera-
ture is reduced and since the turbine blades are
more lightly loaded, you get more reliability.
You'll probably get longer life on hot section
components due to the lower temperatures.
 Upper fairing and cowling-Holes or I KEEP
 GETTING AN
cracks? If you see a hairline scratch ANSWER IN

 TAP AROUND THE AREA.
 IF YOU GET A DIFFERENT
 SOUND IN ANY ONE 5POT...'YOU
 PROBABLY GOT A CRACK.

 Tailpipe fairing-Hose or cracks?
Go over the rubber insulation on the
fairing to make doubly sure it's se-
curely bonded. Here's why.
 There's a transmission and engine
oil-cooling blower mounted on the M \
second section of the tail rotor drive
shaft. This baby has no controls or i i RUBBER
clutches and draws cooling air thru BONED
a screened duct in the left side of TIG
your HueyCobra.
 This blower runs all the time the engine is running. The only problem is
that any hunk of rubber or a loose rivet in the doghouse can be sucked into
the fan. You know what happens when it hits the fan the blower coupling
on the shaft is sheared in seconds and your bird is grounded for a blower change.