EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
COMBUSTION
CHAMBER
BORESCOPE
INSPECTION
Page 116
Sep 03
COMBUSTION SECTION
(-5B, -7B) :
Double Annular Combustor (DAC).
The combustor is inspected through ports S12, S13, S14,
S14.5, S15 and igniter ports S10 and S11.
Inspect for defects in the following 3 areas :
- outer liner.
- inner liner.
- dome assembly.
Probe 2 (yellow) is recommended for general viewing of
the combustion chamber.
Probe 3 (green) is recommended for viewing
circumferentially around the combustion chamber and the
inner liner that is adjacent to the borescope port.
Probe 4 (blue) is recommended for viewing the outer liner
that is adjacent to the borescope port.
Probe 1 (black) is recommended for viewing the aft ends
of the inner and outer liners. It is also used for evaluating
defects that were found when using probes 2, 3, or 4.
If any defects are found during this inspection, a complete
inspection of the combustion chamber is performed. Map
the defects on the special reporting form.
Note: Take care when introducing the probe into the
chamber, so as not to damage the thermal barrier coating
on the centerbody.
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