Teledyne TSIO-360-RB, Maintenance Manual

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21-4
21-3 CRANKCASE INSPECTION
50 HOUR - Visually inspect accessories for security and all gasket areas for oil leaks. All
accessory and cylinder mounting studs must be visually inspected and checked for security.
Safety mechanisms such as lockwire and locking tab washers must be inspected for proper
installation and security. Inspect engine mount brackets for cracks and security. Inspect all
areas of crankcase for cracks.
100 HOUR - Perform all visual inspection requirements of 50 hour inspection. Inspect
crankcase for cracks in accordance with the following instructions.
Critical (gray) and non-critical areas are illustrated in Figure 21-3. If a crack is observed in
any of the non-critical (dark gray) areas that is less than two (2) inches in length, the crack
should be scribe marked at its extremities and re-inspected for crack progression at the next
50 hours of operation. If no progression is observed and no additional cracks are found,
continue to inspect at regular intervals not to exceed 100 hours duration.
If a crack is observed in any non-critical (dark gray) areas that is more than two (2) inches in
length, or if a previously observed crack has progressed to two (2) or more inches in length,
repair or replace the crankcase prior to further flight. If any crack is observed in a critical
(gray) area, repair or replace the crankcase or engine prior to further flight.
Reasons for crankcase replacement:
A. Any crack in the critical (gray) areas.
B. Any crack two (2) inches or more in length in the non-critical (dark gray) area.
C. Any crack that is leaking oil (not seeping).
FIGURE 21-2. INSPECTION OF CRANKCASE NON CRITICAL AREA