(1)
The first inspection is a visual inspection of the external surfaces
(a) This inspection includes the TGB housing, the mounts, and the lockwire.
(2)
The second inspection uses a borescope to examine the internal surfaces of the TGB.
(a) Use this inspection if you find the damage as follows:
1) If you find pieces of a tab washer in the magnetic chip detectors (MCD). The borescope equipment will permit you to see if the tab washer for the horizontal bevel gear is broken.
2) If you find pieces of aluminum in the magnetic chip detectors (MCD). The borescope equipment will permit you to see if the vespel nut has become loose and has damaged the oil nozzle tip.
3) If you find metal bearing particles in the magnetic chip detectors (MCD). The borescope equipment will permit you to see if the roller bearing for the input bevel gear is damaged.
(3) Unless specified differently, if you find damage which is more than the limits, you must replace the TGB.
B. To get access to the TGB, you must open the left fan cowl panel.
TASK 72-62-01-216-001-C00
2. Transfer Gearbox External Inspection____________________________________
A. References
(1) AMM 71-11-02/201, Fan Cowl Panels
B. Access
(1) Location Zones
502/602 Left Fan Cowl Panel
506/606 Engine
C. Do the Inspection of the External Surfaces of the Transfer Gearbox
(Fig. 601)
S 016-002-C00
(1)
Open the left fan cowl panel (AMM 71-11-02/201).
S 216-003-C00
(2)
Examine the transfer gearbox (TGB) housing for the damage that follows:
(a)
Cracks are not permitted
(b)
Nicks, dents, scratches are permitted with no maximum quantity if they are not more than 0.035 inch (0.9 mm) in depth after you remove the burrs.
(c)
Leakage is not permitted. Tighten the fittins or replace the seal.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A
OIL NOZZLE PLUG
A
TRANSFER
GEARBOX
HORIZONTAL DRIVE
SHAFT HOUSING
A
SELF-LOCKING NUT
V-CLAMP
A
S-M56-MM-0910-(1)-00-B
Transfer Gearbox Inspection Figure 601 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
VENT TRANSFER PRESSURE GEARBOX TUBE
B
LIGHT
SOURCE FIBERSCOPE
OIL NOZZLE
TGB PORT
VESPEL
NUT
C C
HORIZONTAL BEARING
BEVEL HOUSING
GEAR TGB HOUSING
B-B
HORIZONTAL
DRIVE SHAFT
SLEEVE
Transfer Gearbox Inspection
Figure 601 (Sheet 2)
B
VENT
GASKET NIPPLE
A-A
INPUT BEVEL GEAR
TGB HOUSINGROLLER
BEARING
BORESCOPE
C-C S-M56-MM-02470-00-B
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