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A. Outer liner axial cracks Any number across 1 Panel or less and up to 3 cracks across more than 1 panel but not longer than 3 panels If up to 3 cracks extendacross more than 3 panels,borescope the outer sideof the outer liner in thecrack locations (Ref. TASK 72-42-00-290-006). See limit extension
(Ref. TASK 72-00-00-200-025).
NOTE : When applying limits, the dome band is interpreted as a panel.
____
B. Inner liner axial cracks Any number across 1 panel or less and up to 3 cracks across more than 1 panel but not longer than 3 panels If up to 1 crack is across4 Panels, and no materialis missing more than 2times the diameter of adilution hole and does not
connect to a
circumferential crack
longer than 0.5 in. (12.7 mm), then reinspect in 750 cycles.
R C. Circumferential There is no limit to the See limit extensions
R R R R cracks number with these conditions: The cracks are no longer than 2 dilution lands. There (Ref. TASK 72-00-00-200-025)
R are no more than 2
R R adjacent cracks in a dilution land. The
R R cracks are separated by a minimum of 3 dilution
R lands that do not have
R cracks.
NOTE : A dilution land is the area of the panel between the dilution
____See limit extension(Ref. TASK 72-00-00-200-025)
holes.
D. Connected cracks Connection of any axial
and circumferential
cracks up to max limits
of paragraphs A. B. and
C. above. Limit is
exceeded when third
crack connects
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E. Burn through or Per liner : 6 areas, See limits extension
missing material each 2 times the (Ref. TASK 72-00-00-200-diameter of a dilution 025) hole. 2 areas of burn-through or missing material may be aligned axially on adjacent panels if they are at least 3 dilution lands from another area of burn-through or missing material.
F. Distortion Any amount within 0.5 See limit extension in. (12.7 mm) of (Ref. TASK 72-00-00-200-original contour 025)
(6) When the inspection is complete, turn off the light source and remove the borescope.
(7) If any defects are found then remove additional borescope plugs and the spark igniters to inspect all of the combustion chamber. If no defects are found, install parts removed for borescope inspection.
Subtask 72-42-00-010-064
C. Remove parts before additional borescope inspection.
(1) Remove the drain tube from the fuel nozzle adjacent to the 6 o'clock borescope plug.
NOTE : If you remove the drain tube from the fuel nozzle adjacent to
____ the 6 o'clock borescope plug, you will be required to perform a leak check after this inspection. Use the 6 o'clock borescope port only if necessary.
(2) Remove the borescope plugs from the approximate 1 and 6 o'clock positions.
(3) Remove both spark igniters (Ref. TASK 74-21-30-000-002).
(4) Install protective caps on the leads and the spark igniters.
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Subtask 72-42-00-290-056
D. Do a borescope inspection of the entire combustion chamber.
(1) Repeat paragraph 4.B.(1) thru 4.B.(5) for each borescope and spark igniter location.
Subtask 72-42-00-410-059
E. Install parts removed for borescope inspection.
R (1) Apply a small amount of graphite grease (Material No. CP2101) or R Never Seez-Pure Nickel, Special (Material No. CP2619) to the R borescope plug threads and pressure faces.
(2) Install the borescope plugs.
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