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2) No more than 15 cracks that go across 2 panels are permitted , only if the ends of the cracks terminate at a dilution hole or at the end of a panel.
3) No more than 4 cracks that go across 3 panels. 4) Cracks that extend across 4 or more panels are not permitted.
NOTE: If you find cracks that extend across more than
____ 3 panels, do a borescope inspection of the cold side of the outer liner. It is permitted to put the damage on a maximum service extension.
5) A maximum service extension of 100 cycles is permitted if the damage is in the limits that follow (If cold side inspection was not performed) : a) No more than 4 cracks go across more than 2 panels. b) Cracks are not permitted across more than 5 panels in
sequence.
c) If the cracks are found across more than 3 panels in sequence, examine the cracks with the flexible borescope below.
6) If no more than 3 cracks go across more than 3 panels, use a flexible borescope to make an inspection of the cold side of the outer liner as follows: a) The cracks must not go through more than 1 of the last
3 cooling ribs (Nos. 4, 5 and 6). b) Cooling rib No. 1 must not be cracked through. c) Do this inspection every 750 cycles.
7) A maximum service extension of 25 cycles is permitted if the limits that follow are obeyed (If cold side inspection was performed): a) There are no more than 5 cracks across more than 2
panels, but not more than 5 panels. b) A minimum of one of the cooling ribs Nos. 3, 4, 5 or 6 do not have cracks which go through on the cold side. c) Cooling rib No. 1 does not have a crack which goes through.
(b) Axial cracks on the inner liner (Fig. 606)
NOTE: The dome band is counted as a panel.
____
1) The conditions that follow are permitted: a) No maximum number of cracks that go across 1 panel or less.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
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b) No more than 15 cracks that go across 2 panels are permitted, only if the ends of the cracks terminate at a dilution hole or at the end of a panel.
c) No more than 4 cracks across 3 panels are allowed. d) If the cracks are longer than 3 panels, do the step given below.
2) If no more than 1 crack goes across 4 panels, do these steps: a) It is permitted to connect to a burn through hole or
material that is gone that is not more than 3 times the diameter of the dilution hole. b) Also, the cracks cannot be connected to a circumferential crack that is more than 0.50 inch
(12.7 mm) in length. c) Do this inspection again after each 750 cycles.
3) A maximum service extension of 100 cycles is permitted if the cracks are in the limits that follow: a) There are no more than 5 cracks across more than 2
panels and the cracks do not go across more than 4 panels in sequence.
(c) Circumferential cracks
NOTE: To find the length of cracks in areas that do not have
____
dilution holes, use the dilution lands lengths.
1) For dome bands and panel 2 of the inner and outer liner,
use the dilution lands on panel 1.
2) For the panels 4 and 5 of the outer liner and panel 4 of
the inner liner, use the dliution lands on panel 3.
ú 3) There is no limit to the number with these conditions:
ú a) The cracks are no longer than two dilution lands
ú b) There are no more than two adjacent cracks in a
ú dilution land
ú c) The cracks are separated by a minimum of three dilution
ú lands that do not have cracks.
4) A maximum service extension of 100 cycles is permitted if
the cracks are not longer than 3 dilution lands and all are
separated by 3 dilution lands that are not cracked.
(d) Connecting axial and circumferential cracks.
1) A maximum of one axial and one circumferential crack that
connect is permitted if the individual cracks are not more
than their limits.
a) Use the limits given for the axial cracks in the inner
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