Operational Tests

TM 11-6660-204-25

ity is accomplished by means of the operational test

(5) Wires broken because of excessive vibration.

chart (para 3-23). The chart gives the item to be

(6) Defective tubes or vibrator inverter.

tested, the action and conditions under which the

b. When the cause of failure is not immediately

item is tested, the normal indications of correct oper-

apparent, check as many of the above items as is

ation, and the corrective measures. To use the opera-

practicable before starting a detailed examination of

tional test procedures chart, follow the items in nu-

the component parts of the system. Before perform-

merical sequence.

ing the tube checks, refer to paragraph 3-24. If possi-

b. Corrective Measures. The corrective measures

ble, obtain information from the operator of the

listed are those most commonly required to correct

equipment regarding performance at the time trou-

for abnormal indications. In most cases, the column

ble occurred.

indicates the area in which a malfunction must exist

c. Visually inspect the recorder for obvious abnor-

to cause the abnormal indications. Use conventional

malities.

troubleshooting procedures to isolate the malfunc-

3-21. Operational Tests

tion or trouble. A troubleshooting flowchart is pro-

a. General. Determination of operational capabil-

3-15

Change 3