TM 1-1500-204-23-1
Table 7-1. Repairing Induction Vibrators
Trouble
Probable cause
Remedy
Unit fails to function
Not grounded
Ensure mounting bolts
contact grounding plate.
Loose or disconnected
Ensure terminal clip is secured
positive cable
to positive cable and positive
terminal post.
Loose or disconnected
Ensure both cables are secured
MAG or IGN. SW TERMINALS
to terminal nuts with springs.
Tighten nuts until a firm contact
is made with the terminal.
Dirt between points
Draw paper, Federal Specification
UU-P-268, dipped in trichloro-
ethylene O-T-634, across points
and air dry.
6
Turn fuel booster pump to OFF position.
7
Turn ignition switch to BOTH position.
8
Place master Ignition switch in ON
position.
9
Engage starter, observing all ground
safety rules.
10
Note continual flow of high voltage across
spark plug points.
7-5. Engine Removal Criteria. The life of an aircraft
engine between overhauls is dependent upon many
factors, such as quality of original manufacture or last
overhaul, the type of operation being accomplished, and
the efficiency of preventive maintenance. It is possible
to establish a maximum expected life of an engine
based on service records and engineering data. At
overhaul depots, it has been found that many engines
are changed needlessly. A complete investigation of
the engine should be made before removal, except in
cases of complete internal failure or expiration of
operating time limits (Refer to AR 750-23).
a.
Expiration of Operating Time Limit. Engine
removal and replacement shall be accomplished in
accordance with TM 55-1500-328-25 when normal
Maximum Allowable Operating Times (MAOT) are
accumulated In accordance with the applicable aircraft -
20 maintenance manual (Chapter 3, Section IV).
b.
Sudden Engine Stoppage. Sudden stoppage is
defined as the complete stalling of the engine due to a
propeller or rotor accident or gear box failure. Such
engines shall be replaced.
NOTE
Replace engine when engine is
stalled by propeller or rotor striking
an immovable object, such as a ramp
or building or when engine is
operating at any rpm and is stalled
suddenly due to some Internal cause
such as gear box or crankshaft
failure.
7-23
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