TM 55-4920-401-13&P
Figure 2-11. Engine Trim Check Setup Using Trimmer Removed from Tester
switch box. Connect check cable to JETCAL receptacle on
switch box. When switch SW-5 on switch box is turned to
JETCAL position, temperature of aircraft thermocouples is
indicated by TEMP indicator on tester. When SW-5 is
turned to EGT position, aircraft thermocouple temperature
is read on aircraft indicator(s) for comparison with TEMP
indicator.
c. Turn TEMPERATURE switch to OPERATE
position.
NOTE
Refer to table 1-14 for appropriate RPM
check adapter.
d. Connect BH485 instrument cable to RPM INPUT
INSTRUMENT CABLE receptacle and through appropri-
ate adapter to aircraft N1 or N2 tachometer generator.
e. Turn RPM switch to appropriate position (N1 or
N2).
f. Turn FUNCTION SELECT switch
tion and MASTER POWER switch to ON.
NOTE
to TRIM posi-
If trimmer is used in cockpit, monitor engine
temperature on tester TEMP indicator for hot
start.
g. Start engine and trim to applicable engine specifica-
tions.
h. RPM and TEMPERATURE indications may be
temperature corrected to standard day conditions as fol-
lows:
(1) Adjust AMB TEMP potentiometer until
ambient temperature is displayed in adjacent window.
(2) Turn STD DAY switch to ON position. If STD
DAY lamp flashes, indicative of a switch being in wrong
position, that RPM switch is in N1 or N2 position, and that
FUNCTION SELECT switch is in TRIM position. % RPM
and TEMPERATURE readings will be automatically
temperature corrected to standard day conditions.
Change 6
2-11
