CFM CFM56 Series User Manual

EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
BASIC ENGINE
PARTICULARS
BORESCOPE INSPECTION
Page 42
Sep 03
THE LOW PRESSURE TURBINE (LPT)
The LPT drives the fan and booster through the LPT
shaft. The LPT rotor/stator has:
(-2, -3, -5A, -5B, -7B) : 4 stages (-5C) : 5 stages.
(ALL) :
It is located between the HPT and the turbine frame.
Its front ange is mounted on the rear ange of the
combustion module.
There is an aluminization coating on:
(-2, -3, -5A) : rotor stg 1 (-5B, -5C, -7B) : rotor stg 1 & 2.
(ALL) :
On all stages, each blade tip shroud has 2 seal teeth for
air sealing, and 3 of the blades have hard-coated tips
to rub against honeycomb material on the stator seal
segments.
Borescope ports.
The LPT borescope ports are located on the combustion
case and around the LPT case at approximately:
(-5A, -5B, -5C, -7B) 5 and 8 o’clock (-2, -3) 3, 5 and 8
o’clock.
(-2, -3, -5A) :
5 ports are available to inspect the LPT.
They are designated S17, S18 ( stage 1), S20 (stage 2),
S21 (stage 3) and S22 (stage 4).
(-5B, -7B) :
5 ports are available to inspect the LPT.
They are designated S16, S17 ( stage 1), S18 (stage 2),
S19 (stage 3) and S20 (stage 4).
(-5C) :
6 ports are available to inspect the LPT.
They are designated S16, S17 ( stage 1), S18 (stage 2),
S19 (stage 3), S20 (stage 4) and S21 (stage 5).
(ALL) :
Stg 1 ports have an 8 mm diameter, and long plugs with
hexagonal heads.
(-2, -3, -5A, -5B, -7B) :
Stages 2 to 4 ports have a 10mm diameter, and are tted
with (-2, -3, -5A) short plugs with hexagonal heads locked
with wire (-5B, -7B) short self-locking plugs with socket
cylindrical socket heads.
(-5C) :
Stages 2 to 5 ports have a 10mm diameter, and are tted
with short plugs with hexagonal heads locked with wire.
(ALL) :
CAUTION: DO NOT MIX SHORT AND LONG PLUGS
BETWEEN PORTS. ENGINE DAMAGE MAY OCCUR.
TOC

CFM CFM56 Series Specifications

General

Brand	CFM
Model	CFM56 Series
Category	Engine
Language	English