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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
[1] Clearances at specific locations on the engine nacelle that are different from the general clearance table are shown in the section views of Fig. 202.
[2] It is necessary to shave the forward facing mismatch of abutting skin gages if the mismatch is more than +0.015 inch.
[3] All fixed skin gaps that are more than 0.03 inch must be filled and trimmed flush with sealant BMS 5-79 (BMS 5-95 optional). The fixed skin gaps in the core cowl will be filled with Dow Corning 93-006. Do not fill gaps that are less than 0.03 inch.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SKIN SMOOTHNESS
OUTER BODY SKIN SURFACE (FOR STRAIGHT OR
THE WAVE DEPTH IS CONCAVE OR CONVEX
0
10 20 30 40 50 60 70 80
STREAMWISE WAVE LENGTH - INCHES
THE SKIN SMOOTHNESS IN THE CRITICAL AND NON-CRITICAL AREAS OVER THE CONTINUOUS SKIN IS LESS THAN THE LIMITS SHOWN ABOVE. (FOR THE STRAIGHT OR CURVED AREAS)
SMOOTHLY ALIGNED SKIN
SHAPE OF THE SHAVE FAIR
IF THE BUTT JOINTS OF THE TRANSVERSE SKIN IS NOT ALIGNED BY LESS THAN
THE SPECIFIED VALUE, IT IS NECESSARY TO SHAVE THE UNWANTED MATERIAL.
YOU MUST SHAVE THE UNWANTED MATERIAL LESS THAN THE SPECIFIED VALUE.
THE SHAPE OF THE FAIR IS AS SHOWN ABOVE.
Aerodynamic Smoothness - General Information
Figure 201 (Sheet 1)
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B76421
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(+) POSITIVE STEP (-) NEGATIVE STEP
Aerodynamic Smoothness - General Information
Figure 201 (Sheet 2)
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B79118
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
A-A
Aerodynamic Smoothness for the Nose Cowl
Figure 202 (Sheet 1)
B78850
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
INNER ACOUSTIC
0.095 AVG. MAX
LIP ASSEMBLY
B-B
+0.01 -0.03
BULKHEAD
C-C
D-D
____ALL DIMENSIONS ARE IN INCHES
NOTE: UNLESS SPECIFIED DIFFERENTLY.
Aerodynamic Smoothness for the Nose Cowl Figure 202 (Sheet 2)
B78935
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