TM 55-2840-251-23
Section X ENGINE TESTING (Continued)
1-93
GENERAL (Cont)
2.
For testing engines after maintenance to
determine engine flight readiness, using mobile trailer
assembly, proceed as in paragraph 1-95. Instructions
for preparing engines for test, installing test engines on
mobile trailer assembly, prestarting checks, and mobile
trailer assembly operation are provided in TM55-4920-
328-13.
3. Symbols have been designated for the working
variables used in connection with engine testing. The
symbols, referenced to the various stations within the
engine, and their meanings are described as follows:
Pamb
- Ambient pressure
Pt2
- Total pressure -
compressor inlet
screen
P3
- Compressor discharge
air
P2.5
- Compressor interstage
air
Px
- Enrichment pressure
Py
- Governing pressure
Tamb
- Ambient temperature
Tt2
- Total temperature
- Compressor inlet
screen
ITT
- Total temperature
- interturbine
Tt7
- Total temperature
- exhaust
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