TM 55-2815-574-24
0035
TEST PORT AIR BOX PRESSURE
NOTE
Air box pressure should be recorded in inches of mercury using U-tube
manometer.
When using air box drain as source for this pressure test, be sure drain is clean
and clear of obstructions.
To check air box pressure on engines with drain tubes or hoses, use air box
covers with a tapped hole and hose fitting.
The following procedure is typical for both port and starboard engines.
1.
Drain cooling system (WP 0133).
2.
Remove fuel system cooler (WP 0081).
3.
Remove air box drain hose (Figure 3, Item 2) from air box check valve (Figure 3, Item 1).
Figure 3. Air Box Drain Hose.