TB 1-1730-229-20-2
2-5. DC OPERATION, 83-360D. (Page 2-24) Add Note as follows:
NOTE
The 83-360D only operates in the AC mode. All DC output power is obtained by
converting AC. The CURRENT LIMIT SELECTOR switch should be set to one of the
four marked locations (left side of switch) for AC, DC, or combined AC and DC output.
b DC Power Application. (Page 2-25)
(2) Add. On the 83-360D, DC may be supplied with the CURRENT LIMIT
SELECTOR switch (1, figure 2-12) at any of the AC setting.
(6) Add. On the 83-360D, insure that the DC AMPS meter (4) does not read above 350
AMPS except during aircraft starting (or slave start of another AGPU).
CAUTION
The 83-360D does not monitor or regulate the DC output of the TRU. The TRU output
is not protected from an overload. When operating at high DC output the DC AMPS
meter and the DC OVER CURRENT light must be closely monitored to protect the
TRU from overload.
2-6. PNEUMATIC SYSTEM OPERATION, 83-360D.
b Pneumatic Power Application. (Page 2-27) Add Note as follows:
NOTE
The air output is reduced when the surge control valve is open. Do not attempt to
service the AH-64A or ground air start any aircraft when the CURRENT LIMIT
SELECTOR switch is in the "AH-64D" setting.
2-8. COMBINED OUTPUT OPERATION, 83-360D.
a. (Page 2-34)
(1) Start the first sentence with: On the 83-360A AGPU ----
(2) Add new subparagraph: On the 83-360D AGPU all the DC comes from the TRU,
which is powered by the AC output of the generator, its input load requirement is not available as
AC output. The CURRENT LIMIT SELECTOR switch position selected must consider both the
AC and DC output loads. The generator control unit can no longer regulate the DC output so its
control over the DC contactor has been bypassed. Also on the 83-360D, the AH-64D position of
the CURRENT LIMIT SELECTOR switch opens the surge control valve, which reduces the
available airflow.
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