screw changes N1 approximately 1% PTIT
approximately 25_C and torque 5 - 6%. If the
recorded N1 is acceptable, but the recorded
PTIT is lower than it should be according to
11a, a resistance check of the PTIT harness
should be performed. If the PTIT indicating
system is OK the engine is acceptable.
U. DIFFERENTIAL CURRENT PROTECTION CIRCUIT
Perform this check whenever maintenance has been
performed on a generator, or a generator control unit, a
current transformer or the wiring between these units.
Perform the check as follows:
1. Set the following switches to the specified
a. HEATER VENT BLOWER ONLY.
b. CPLT, CTR, and PLT WINDSHIELD
c. CPLT and PLT SLT-FIL ON.
d. FUEL PUMPS ALL ON.
2. GEN 1 switch OFF. Check NO. 1 GEN OFF
caution light is on and NO. 2 GEN OFF caution
light is out.
3. GEN 1 switch ON. GEN 2 switch OFF.
Check NO. 1 GEN OFF caution light is out and
NO. 2 GEN OFF caution light is on.
4. GEN 2 switch ON. Check both GEN OFF
caution lights are out.
5. HEATER, WINDSHIELD ANTI-ICE, SLT-FIL,
and FUEL PUMPS switch Set as desired.