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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
HPT Blades and Shrouds and 1st-Stage LPT NGV's - Inspection
___________________________________________________________ 3) Install the left spark igniter (AMM 74-21-02/401). a) Tighten the clamp on the igniter cable.
 S 846-044-C00
 (6) Do the procedure to put the airplane back to its usual condition.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
The 1st- and 2nd-Stage LPT NGV's Inspection For Bronze Particles in the
_______________________________________________________________________ Fuel Filter
___________
 TASK 72-00-00-206-074-C00
 8. The 1st- and 2nd-Stage LPT NGV's Inspection For Bronze Particles in the
_______________________________________________________________________
 Fuel Filter

___________
 A. General
 (1)  This procedure is used when large amounts of bronze particles are found in the fuel filter.
 B. Equipment
 (1)  Borescope - Flexible, 6 mm diameter,
 90 degree angle view head, CFMI 856A1321.

 C. References
 (1)  
AMM 71-00-02/401, Power Plant

 (2)  
AMM 73-11-04/401, Fuel Nozzles

 D. Access
 (1)  Location Zones
 506 Left Engine
 606 Right Engine

 E. 1st and 2nd Stage LPT Nozzle Borescope Inspection.
 S 866-075-C00
 (1)  If not already done, do the procedure to prepare the airplane for the inspection.
 S 016-081-C00
 CAUTION:_______USE ONLY TRAINED PERSONS FOR THIS INSPECTION PROCEDURE. ACCESS TO THIS AREA OF THE ENGINE IS DIFFICULT. DAMAGE TO THE ENGINE AND THE FLEXIBLE BORESCOPE CAN OCCUR.
 CAUTION: DO NOT TURN THE LOW PRESSURE TURBINE (LPT) ROTOR WHEN YOU DO
_______ THE BORESCOPE INSPECTION. DAMAGE TO THE ENGINE AND THE FLEXIBLE BORESCOPE CAN OCCUR.
 (2)  Remove these borescope plugs (Fig. 607B).
 (a)  
The plug (S17) at the 5 o'clock position immediately in front of the aft flange of the combustion case.

 (b)  
The plug (S18) at the 8 o'clock position immediately in front of the aft flange of the combustion case.

 (c)  
The plug (S20) at the 5 o'clock position.

 NOTE: CFM56 engine with 9 probe EGT probes, borescope port S20
____ is at the 3 o'clock position.
 S 216-077-C00
 (3)  Examine the 1st-Stage LPT NGVs.
 (a)  Install a flexible borescope in the port S17.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
A
SEE A
G-M56-NT-0035(1)-00-B
S20
S21 A
1 TOP VERTICALS22 S17
SEE B
A
STAGE  BLADES NO. OF  VIEW PORT NO. LEADING EDGE  VIEW PORT NO. TRAILING EDGE 
1  174  S17 - S18  S20 
2  162  S20  S21  S18 

S17
1
S20 BORESCOPE PORT IS LOCATED AT 3 O'CLOCK
1st-STAGE LPT BORESCOPE PORT LOCATION
POSITION ON ENGINES WITH LPT CASE EQUIPPED FOR 9-PROBE EGT SYSTEM (9 BOSSES) (VIEW IN THE FORWARD DIRECTION) A-A 1st and 2nd-Stage LPT NGV Inspection for Bronze Particles in the Fuel Filter Figure 607B (Sheet 1)
C75571
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