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C. Broken actuation ring connector, one side only, 5 cycles
if connector is replaced
D. Vane actuation ring cracks, distortion, bends, 5 cycles
twists or distress, provided ring has not
separated
E. Loose vane assemblies with metal-to-metal contact 10 cycles or 25
on up to 50 percent of vanes hours
5. Combustion case
A. Forward and aft flange radial cracks inward from 10 cycles
bolt holes
B. Midflange radial cracks 10 cycles
C. Maximum of 10 broken midflange bolts with no more 25 cycles
than 4 broken bolts in any group of 20
D. High pressure turbine (HPT) shroud cooling and 10 cycles
compressor discharge pressure (CDP) pad cracks
more than 0.06 in. (1.52 mm) from bolt holes
6. Combustion chamber
A. Dome assembly
(1) All limits are allowed up to 20 percent 25 cycles
beyond serviceable limits
B. Inner and outer liners
(1) Axial cracks 25 cycles
Four cracks in a maximum of 4 consecutive
panels
(2) Circumferential cracks 25 cycles
Any number up to 3 dilution lands in length
separated by 3 noncracked dilution lands
(3) Connected cracks 25 cycles
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Connection of any axial and circumferential
cracks up to max. Limits of steps (1) and (2)
above
(4) Burn-through or missing material
Per liner: 5 areas each twice the diameter of 25 cycles
a dilution hole, and 2 areas, each 3 times
the diameter of a dilution hole. Maximum
axial alignment is 3 adjacent panels
separated by circumferential length of 3
non-distressed dilution lands
(5) Missing overhangs 25 cycles
Per liner: 17 areas each twice the size of a
dilution hole, providing max axial alignment
of distress is 4 adjacent panels
(6) Distortion 25 cycles
Any amount within 0.7 in. (17.8 mm) of
original contour
C. Combustor inner cowl bolts
(1) Missing bolt: Maximum of 3 bolts are missing 50 cycles for next
with 4 bolts intact between 2 missing bolts. check, then repeat
All other bolts are tight with tack welds BSI every 400
intact cycles
(2) Bolt tack weld cracked but bolt is not loose: 25 cycles for first
If a maximum of 5 tack welds are cracked, no check, 50 cycles
more than two consecutive, with 4 tack welds for second check,
intact between two cracked tack welds repeat BSI check
100 cycles
(3) Bolt tack weld is cracked and bolt is loose: 5 cycles
If one or more bolts are loose
7. HPT nozzle
A. Leading edge missing material, from cracking or 25 cycles
burn-through, up to 0.5 in. (12.7 mm) X 0.5 in.
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CONDITION MAX EXTENSION
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