___________
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
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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