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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
_________________________________________________________ 4) No maximum limit to the number of nicks, marks, scratches, and dents on the surface of the platform. 5) No maximum limit to the number of bulges and bows.
(g) Discourager seal (Fig. 606B)
1) No maximum limit to the amount of burned or eroded material if there is a positive overlap between the HPT rotor blade seal lip and the discourager seal. a) If the forward face of the HPT blade seal lip is
visible, do a check in 500 hours.
2) A maximum service extension of not more than 25 cycles is permitted if the positive overlap between the HPT rotor blade seal lip and discourager seal is opened to the cavity below.
S 216-029-C00
(10) If you find damage during the borescope inspection, you must do a full borescope inspection of the combustion chamber and HPT nozzle guide vanes as follows:
(a)
Remove the borescope plug (S12) at the 1 o'clock position forward of the fuel manifold (Fig. 606C).
(b)
Remove the igniter plugs (AMM 74-21-02/401).
(c)
Install the flexible borescope and, after adjustment, do a borescope inspection of the combustion chamber and the HPT NGV's again.
NOTE: For this inspection, you must use a flexible
____ borescope so you can see the full combustion chamber and HPT NGV's.
It is not recommended to use the port at the 3 o'clock position. If it is used, you must first remove the fuel tube. After the inspection, you must also do a leak check.
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CFM56 ENGINES
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1185430-00-A
HPT NGV Inner Platform Airfoil Trailing Edge Burn Figure 606A
L77150
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
1185431-00-A
Discourager Seal Figure 606B
L80387
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
_________________________________________________________
(d) Install the igniter plugs (AMM 74-21-02/401). S 416-090-C00
CAUTION:_______ MAKE SURE YOU INSTALL THE CORRECT BORESCOPE PLUG IN THE CORRECT
LOCATION. THE BORESCOPE PLUG TO THE LPT STAGE 1 AND COMBUSTION
CASE HAVE THE SAME THREAD SIZE. THE BORESCOPE PLUG STEM OF THE
LPT STAGE 1 NOZZLE WILL BE BURNED AWAY IF IT IS INSTALLED IN
THE BORESCOPE PORT OF THE COMBUSTION CASE.
(11) Do these steps to install the borescope plugs (Fig. 606C):
(a)
Apply a light layer of graphite grease (CP2101) to the borescope plug threads and the mating surfaces.
(b)
Install the plugs in the borescope ports.
(c)
Tighten the plug to 57-63 pound-inches (6.3-7.0 N.m).
(d)
Install a lockwire on the plug.
S 846-032-C00
(12) Do the procedure to put the airplane back to its usual condition.
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