There are only minor changes to the exterior of the AGPU. The 83-360D can be
identified by an MWO identification plate located just below the nameplate and revised
labeling on the control panel. The TRU can be seen in the upper left of the DC cable
bay, just under a 6-inch flexible flap marked "83-360D".
c. Engine/Gearcase. Add a Note as follows:
The exhaust ejector inlet tube, Item 2, Figure 1-8, is being replaced with an open 30-
degree elbow directing the exhaust gas down toward the inlet to the flu. The 17 tubes
shown at the inlet to the flu are replaced with a rectangular duct. Figure 1-8a will be
revised. (Attached Figure A shows the modified exhaust ejector.)
d. Generator. Add a Note as follows:
The 83-360D AC generator is also a self-cooled, continuous duty, self-excited,
brushless unit only without the two windings used to provide 28 VDC output. The
rectangular box on the top of the generator is eliminated. It contained the DC output
terminals and the generator control unit (GCU) connector, which is located on the
primary housing of the AC generator. The GCU has been modified to control the larger
capacity AC generator. Since AC power is still needed, even when only DC is being
supplied by the TRU, the CURRENT LIMIT SELECTOR switch is rewired so that the
GCU is always monitoring the AC output.
1-10. TABULATED DATA, P/N 83-369D.
Table 1-1. Tabulated Data. (Page 1-16) To be revise as follows:
1. Aviation Ground Power Unit (AGPU).
Marconi Astronics Inc.
(Serial No. 0001-0659)
Engineered Air Systems Inc.
(Serial No. 1001-1155)
Operating environmental capabilities: (No change.)
AC voltage output: (No change.)