Honeycomb Air Seals - GE XV-5A Installation, Operation And Maintenance Instructions

section to the outer skin.
This channel, or cover plate, closes off the
"cold" portion of the turbine nozzle.
The cover plate and the outer skin
of the rear frame are pierced with holes to accommodate bolts and nuts to
fasten the rear frame inner insulation blanket at assembly. A tab of 0.020"
sheet is spot welded to these holes for reinforcement.
h.
Six clevises fabricated of 0.040" sheet are welded to the outer
skin in the "hot" section of the turbine.
These clevises serve as an attach-
ment point for the rear-frame-to-scroll adjusting links at assembly.
i.
Thirty-seven brackets fabricated of 0.040" sheet are welded to the
aft face of the rear frame. These brackets accommodate the exit louver
bearing supports.
Two pads of 0.140" sheet are welded to each bracket. The
pads are drilled with a counter-sunk hole. Shank nuts are swaged to these
holes to these holes to provide bolt attachment for the louver bearing supports.
j.
The exit louver push rod strut extends across the aft face of the
rear frame from the 12 o'clock position to the 6 o'clock position. The outer
skin and end caps of the airfoil-shaped strut are formed of 0.045" sheet.
The
leading and trailing edges are machined from bar stock. The brackets at each
end of the strut are machined from bar stock and welded in place. Fourteen
bushings are welded to each side of the strut. These bushings accommodate
the exit louver actuator linkage.
k. Inconel X doublers have been welded to the ends of the rear frame
strut adjacent to the exit louver actuator attachment. The doublers are
designed to permit proper actuator load distribution into the strut and
eliminate possible panel buckling.
i.
A curved Inconel X sheet metal fairing is welded to the sides of
the rear frame strut ends.
The fairing provides a means of attachment and
support of the actuator covers.
2.44 HONEYCOMB AIR SEALS
a.
The rear frame honeycomb air seal sectors are made of 321 stainless
steel.
Each sector consists of a honeycomb seal, a backup ring sector, two
gussets. a washer and two spacer bars. The honeycomb is made of 0.003" sheet
which is formed into 0.125" hexagonal cells and brazed to the 0.020' backup
1-2.24
R-1