EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL
TRAINING MANUAL
BASIC ENGINE
PARTICULARS
BORESCOPE INSPECTION
Page 40
Sep 03
THE HIGH PRESSURE TURBINE (HPT) & STAGE 1
LPT NOZZLE
(ALL) :
Borescope ports.
The HPT section / stage 1 LPT nozzle borescope ports
are located around the combustor case.
(-2, -3, -5A) :
They are numbered S17 and S18.
(-5B, 5C, -7B) :
They are numbered S16 and S17.
(ALL) :
Having an 8 mm diameter, they accommodate long
spring-loaded plugs with hexagonal heads, and can be
used to inspect the blades trailing edges.
Blades leading edges can be viewed through combustion
chamber ports S12 thru S15.
(-2, -3, -5A) :
CAUTION : DO NOT MIX PLUGS S17 & S18 WITH
PLUGS S12 TO S15. INSTALLING THEM IN THE
WRONG PLACE MAY CAUSE ENGINE DAMAGE.
(-5B, 5C, -7B) :
CAUTION : DO NOT MIX PLUGS S16 & S17 WITH
PLUGS S12 TO S15. INSTALLING THEM IN THE
WRONG PLACE MAY CAUSE ENGINE DAMAGE.
(ALL) :
Ports S10 and S11 correspond to the igniter plugs and
can be used to look at the HPT front sections.
They have a 10mm diameter.
Refer to the AMM for igniter plugs removal procedure.
Because of their location, HPT blades cannot be
inspected with a rigid probe. Use a flexible probe with a
guide tube, and pass through the combustion chamber
and HPT nozzles, to access the HPT blades.
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