Figure 5-11. Pneumatic Connection to Water Manometer.

TM 9-1270-219-13&P

Figure 5-11. Pneumatic Connection to Water Manometer.

(4) Open the tank vent valve to return the pres-

h. Static Pressure Leak Test.

sure to ambient.

NOTE

i. Altitude

Calibration

Check.

Leak tests for the EPU are performed by

Connect the EPU for test as shown in figures

(1)

monitoring leak rates on the Test Set

5-8 and 5-10.

DATA

WORD

display,

therefore

essential that the pressure source (Tester,

P i t o t Static Systems) is isolated prior to

S e t test set switch S8 DATA WD SEL TO

(2)

monitoring the leak rate.

P A B S. S e t t e s t s e t s w i t c h S 7 R D R A L T F T

to 30. Close the tester vent valve and open

(1) Connect the EPU for test as shown in figures

the tester pressure source valve. Close the

5-8 and 5-10.

t a n k vent valve. Set the Tester, Pitot Static

Systems to the values detailed in Table 5-8.

(2) Set test set switch S8 DATA WD SEL to

P ABS a n d r e c o r d t h e D A T A W O R D d i s p l a y .

Check that the DATA WORD display on

the test set reads the values detailed in Table

Close the tester vent valve and open the

5-8.

tester pressure source valve. Open the tank

vent valve.

Open the tank vent valve to return the pres-

(3)

(3) Apply sufficient static pressure to reduce the

sure to ambient and disconnect the pressure

t e s t set numeric readout value to 018 units

equipment.

(equivalent to a pressure of 10,000 ft above

prevailing ambient pressure). Start the stop-

S w i t c h off power to the test set by setting

(4)

watch

and

check

that

the

DATA

WORD

test set switches CB1 and CB2 to OFF and

display on the Test Set does not change by

disconnect the EPU under test from the test

more than 2 units in 3 minutes.

set.

5-18