TB 1-1730-229-20-2
(Page 4-220)
4-56a. TRANSFORMER RECTIFIER UNIT (TRU).
A new paragraph will be added describing removal and replacement of the TRU.
4-61. AC POWER CABLE.
Figure 4-42. AC and DC Power Cables (sheet 1 of 3) (Page 4-225) Add: "(83-360A Only)"
Figure 4-42a. AC Power Cables (83-360D Only)
Add a revised figure 4-42, ( sheet 1 of 3) as follows:
Delete DC connections and relocated connections to the new AC generator on the 83-360D.
(See Figure C attached.)
Section XII. MAINTENANCE OF PNEUMATIC SYSTEM
(Page 4-244)
4-74 GENERAL.
Change line three from "a solenoid valve" to two solenoid valves"
Figure 4-54, Pneumatic System Diagram (page 4-247) will be changed to show the surge control
valve
Add a new subparagraph g. as follows:
"g. Surge Control Valve (SCV). This solenoid valve (31) opens when the CURRENT
LIMIT SELECTOR switch S11 is set to 45KW or 1000 A on the 83-360A and when set to AH-
64D on the 83-360D. On the 83-360A the 28 vdc signal to open the valve is routed through the
both the PNEUMATIC POWER switch S8 and the CURRENT LIMIT SELECTOR switch S11
so that the surge control valve will not open whenever pneumatic power is ON. On the 83-360D
the 28 vdc signal is routed directly to the CURRENT LIMIT SELECTOR switch S11, which
then operates the surge control valve, whether the pneumatic power is On or OFF. This valve is
needed to off load the GTE compressor to eliminate stall. This is necessary when large shaft
horsepower is required."
Figure 4-55, Pneumatic System (page 4-249) will be changed to show the surge control valve
(Reference Figure 68 in TM 55-1730-229-24P for details.)
FO-2D LIGHTING SYSTEM SCHEMATIC/WIRING DIAGRAM, 83-360D
Changes in this new wiring diagram will include:
- Disconnecting wires L10B20 and P16B20 from the positive and wires P53B20N and P53C20N
from the negative terminal of the DC Over Current light DS19. This disconnects both DS19 and
13
