TM 55-2840-231-23
1-41. ENGINE CONTAINER – INTERNAL PRESSURE AND HUMIDITY CHECK – Cont.
ACTION
ENGINE CONTAINER/-
NOTE
Continued
The humidity indicator should change
to light blue in an atmosphere of less
than 37 percent relative humidity
unless it has absorbed sufficient
moisture to wash away or destroy its
chemical properties.
Refer to paragraph 1-40 (item 3).
b. If humidity indicator
changes to light lavender or
lavender pink after
container has been
pressurized, open the
container and inspect the
engine for corrosion.
Replace the desiccant (item
8, Appendix D).
1-42. SPECIAL INSPECTIONS.
This section provides special inspections to be performed on the turbine when the engine has experienced
operation beyond allowable temperature limits. Tables 1-6 and 1-7 list the various overtemperature conditions
for starting and power transients and the maintenance action required for each.
Table 1-6. Overtemperature During Start
Temperature Range
Time
Maintenance Action
1380°F-1700°F (749°C-927°C)
Over 10 seconds
Inspect turbine. *
1700°F-1830°F (928°C-999°C)
Anytime
Inspect turbine. *
Over 1830°F (999°C)
Anytime
Remove engine for depot
maintenance or overhaul.
NOTE
1. Refer to Procedure 7,
Troubleshooting Chart when
temperature consistently exceeds
1550°F (843°C).
2. The time-at-temperature limits
are not additive and may be repeated
without restrictions.
*Refer to Turbine Overtemperature Inspection paragraph 1-43.
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