TM 55-4920-413-13&P
CHAPTER 4
MAINTENANCE INSTRUCTIONS
Section I. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
4-1. General.
not operate, troubleshoot with proper equipment. Re-
port any deficiencies using the proper forms, see DA
Preventive maintenance checks and services consist of avis-
PAM 738-751.
ual inspection to be done at each operation of the test set, oper-
ational check, any troubleshooting required, and the repair
4-2. Inspections.
required to correct any malfunctions. If your equipment does
Do inspections as shown in Table 4-1.
Table 4-1. Operation/Aviation Unit Preventive Maintenance Checks and Services.
NOTE: Within designated interval, these checks are to be done in the order listed.
B – Before
D – During
A – After
4-3. Scope.
Section II. TROUBLESHOOTING (AVUM)
b. This manual cannot list all possible malfunctions that may
occur or all tests or inspections and corrective actions. If a mal-
a. This section contains troubleshooting or malfunction in-
function is not listed (except when malfunction and cause are
formation and tests for locating and correcting most of the trou-
obvious), or is not corrected by listed corrective actions, you
bles which may develop in the LTS. Each malfunction or
should notify higher level maintenance.
trouble symptom for an individual component, unit, or system
c. Table 4-2 lists the common malfunctions that you may find
is followed by a list of tests or inspections necessary for you
during the operation or maintenance of the LTS or its compo-
to determine probable causes and corrective actions for you to
nents. You should do the tests/inspections and corrective ac-
remedy the malfunction.
tions in the order listed.
4-1
