CASE LEAK VALVE LEVERS.

TM 55-4920-231-14

(2) Case leak (CL) provides for case leak

22. CASE LEAK VALVE LEVERS.

test and/or calibration of airspeed indicator (6,

The case leak valve levers (3, 4, 5, 7, and 8,

figure 8) operate valves which provide for test-

c. Case leak valve lever (5, figure 8) has three

ing aircraft instruments and checking the master

positions:

instruments on tester for case leaks and/or cali-

(1) Normal (NOR) provides for static test

bration.

of airspeed indicator from aircraft.

(2) Case leak (CL) provides for case leak

a. Case leak valve lever (3, figure 8) has

test and/or calibration of airspeed indicator (6,

three positions:

(1) Normal (NOR) provides for static tests

(3) Vent (V) provides for venting vacuum

of altimeter and rate-of -climb indicator from air-

from tester.

craft.

d. Case leak valve lever (7, figure 8) has two

(2) Altimeter (ALT) provides for case leak

positions:

test and/or calibration of altimeter (3, figure 7)

(1) Normal (NOR) provides for static test

on tester.

of manifold pressure gage from aircraft.

(3) Rate-of-climb (ROC) provides for case

(2) Case leak (CL) provides for case leak

leak test and/or calibration of rate-of-climb indi-

test and/or calibration of manifold pressure gage

cator (2) on tester.

(7, figure 7) on tester.

b. Case leak valve lever (4, figure 8) has two

e. Case leak valve lever (8, figure 8) has two

positions:

(1) Normal (NOR) provides for static test

of fuel pressure gage from aircraft.

of airspeed indicator from aircraft.

Figure 8. Upper Access Panel, Open Showing Case Leak Valves.