TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
10 to 15 seconds, then release test
switch.
j.
Repeat the above procedure for the
right bleed air control valve
1.
Left and right bleed air valve switches
OPEN.
m.
Cabin altitude indicator Set to 1800 feet
pressure altitude
n.
Rate control Set.
o.
Cabin pressure dump switch Set to
PRESS position.
*11. Generators and regulators Check
C1-6
by observing volt-loadmeters for the
following conditions
a.
Positive charging rate
b.
27 5 to 29 0 volts
c.
A load indication not exceeding 0.85
d.
Turn generators on one at a time to
insure that each generator comes on
line
e.
Voltmeters must read within 1 volt of
each other
f.
Load paralleling must be within 1
increment on the loadmeter scale
*12. Inverter volt-frequency meters
C36, 37
Check voltage between 110 and 120 volts and
frequency between 390 and 410 Hz
2-32
