Table 2-2 Maximum Allowable Average Temperature of Cooling Air for Carrying Rated K VA

b. Clean and repaint pre-painted surfaces that are

2-16. Operation in Dusty or Sandy Areas Keep the

chipped or corroded

unit as clean as possible paying special attention to the

air filters and grills.

2-19. Operation at High Altitudes The effect of the

decreased air density due to high altitude is to increase

2-17. Operation Under Rainy or Himid Conditions

the temperature rise of the transformer which is

Inspect the unit closely for corrosive action. Clean and

dependent upon air for the dissipation of its heat losses.

paint chipped areas.

The transformer can be operated at rated KVA at

altitudes greater than 3,300 feet without exceeding

2-18. Operation in Saltwater Areas

temperature limits provided the average temperature of

the cooling air does not exceed the temperature shown

a. Salt water causes corrosive action on metal.

in table 2-2

Care must be taken to avoid equipment contact with salt

water. If contact is made, or if unit is exposed to salt

spray, wash the exterior frequently with clean fresh

water

Table 2-2 Maximum Allowable Average Temperature of Cooling Air for Carrying Rated K VA

Method of

Cooling Transformer

3300 Ft.

6600 Ft

9900 Ft.

13,200 Ft

Degrees C

Oil-Immersed

Self-Cooled

with the removal of the landing gear, rear bumper or the

2-20. Operation at 50 Cycle The 50 cycle operation

wheels and suspension.

requires a primary voltage to the transformer of 3467

b. Removal of landing gear assembly (fig. 218).

volts with a reduced KVA rating of 417. A complete

(1) Loosen and remove the two 12-16 hex

rating is: OA-T-50 rycles-417 KVA (65 degrees C)-

head bolts (I) and lock nuts 12) on either end of cross

3467I 3Y / I 00 x 347Y / 200.

shaft (3).

(2) Remove cross shaft (3).

2-21. Operation Using Main Breaker Only

(3) Loosen and remove the four 'St-11 hex

To use the main breaker only the feeder busses should

head bolts (4) and locknuts (5) fastening the four

be disconnected from the main breaker output studs.

landing gear braces to the trailer body.

This is accomplished by removing the removable links

(4) Loosen and remove the sixteen /-13 hex

in each of the three feeder bus connections to the main

head bolts (6) and locknuts (7), 8 for each side,

breaker output. Refer to Organizational Maintenance.

fastening the landing gear brackets to trailer body.

(5) Remove landing gear from trailer.

2-22. Preparation for air shipment

(6) All bolts and locknuts should be inserted

into their respective holes in landing gear assembly for

General. The trailer body must be

safekeeping.

supported in such a manner that it does not interfere

2-31