..............…........................….............…...........................
LOCATIONS OF THE DEPTH VALUES TABLE 601
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(4) Examine the duct segments as follows to find if they are bonded to the fan case.
NOTE: A duct segment that is not bonded is not permitted.
____
(a) With your finger, press the duct segment in the area where you think there is no bond. 1) Examine the segment carefully to see if there is play in
the rubstrip.
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(b) With the plastic end of a screwdriver or other tool, hit the rubstrip lightly all around. 1) Listen to the sound. 2) If the sound is a clear ring (has a high frequency), the
rubstrip is well bonded. 3) If the sound is a dull thud (has a low frequency), the rubstrip is not bonded.
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(5)
Compare the rib damage, cracks, and holes with the limits in Table
602.
(a)
The 60.hour continue.in.service limit for duct segments that have rib damage that is more than the serviceable limits. 1) You can continue to operate the engine for 60 hours, if
there are 12 or less duct segments with rib damage that is more than the serviceable limits.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................................... | TABLE 602 | | DUCT SEGMENT INSPECTION LIMITS FOR RIB DAMAGE, CRACKS, AND HOLES | ................................................................................. | Examine | Serviceable Limits | Repairable Limits | ................................................................................. | Duct Segment Rib that | | | | is not There: | | | | | | | | Total length of each | 3.0 inches (7.200 mm) | 6.0 inches (152.400 mm) | | rib on each segment | Circumferentially Maximum | Circumferentially Maximum | | | | | | Total length of one | 10.0 inches (254.200 mm) | 15 inches (381.000 mm) | | rib, on all segments | Circumferentially Maximum | Circumferentially Maximum | | | | | | Distance from an area| 6.0 inches (152.400 mm) | | | on an adjacent rib | Minimum | | | where there is no rib| | | .................................................................................
| Cracks: | | |
| Width | 0.015 inch (0.381 mm) | 0.125 inch (3.175 mm) |
| | Maximum | Maximum |
| | | |
| Distance (from other | 4.0 inches (101.600 mm) | |
| Cracks) | Minimum | |
| | | |
| Length of a circum- | 4.0 inches (101.600 mm) | 6.0 inches (152.400 mm) |
| ferential crack | Maximum | Maximum |
| | | |
| Length of an Axial | No Limit | |
| Crack That is Within | | |
| 0.250 inch (6.350 mm)| | |
| of the Axial Edge of | | |
| the Segment | | |
| | | |
| Length of other Axial| 4.0 inches (101.600 mm) | |
| Cracks | Maximum | |
................................................................................. | Holes: | | | | Dimension at the | 0.125 inch (3.175 mm) | 6.0 inches (152.400 mm) | | largest width | Maximum | Maximum | | | | | | Depth | 0.125 inch (3.175 mm) | No Limit | | | Maximum | | 2.......................…...........................…...........................1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 发动机 ENGINE 2(8)
