Q12-20. What is the recommended cleaning method
manual. The tables in the manual do not cover all of the
for removing hard carbon deposits?
possible malfunctions, but should be used as a guide
when performing corrective maintenance.
Use a light grit sandpaper
Use a wire bristle brush
The appropriate portion of the maintenance
Use a decarbonizing solvent
section is referenced when specific step-by-step
Use a scraping tool
instructions are to be followed.
LEARNING OBJECTIVE: Identify
Table 12-1 outlines a systematic approach to
procedures for inspecting, testing, and
maintenance. You should note that it is very important
troubleshooting GTC electrical, fuel, bleed air,
that you understand the relationship between the
and lubrication system components.
engine and its enclosure and how they interact. You
must also know the purpose of each system component
At the intermediate maintenance level, you may
before you can systematically analyze the symptoms to
expect to be part of a troubleshooting/maintenance
determine the most likely cause of the problem.
crew, or perhaps even the supervisor. When a
Only those components that are malfunctioning
malfunctioning unit is received, a troubleshooting
crew is assigned to locate the trouble, make the
should be changed. Do not practice shot-gunning,
necessary repairs, and return the equipment to an
which is the removing and replacing of components in
the order of their availability or ease of installation,
r ega r d l e s s o f t h e i r l i ke l i h o o d o f b e i n g fa u l t y.
A guide to common engine malfunctions, their
Shot-gunning is a waste of time, and eventually
probable causes, and appropriate remedies is provided
establishes a large inventory of illegal spare parts.
in the maintenance section of the applicable equipment
Table 12-1.--Malfunction Correction Procedures
TRY TO LOCATE THE TROUBLE BY OBSERVING THE
SYSTEM'S FAULTY OPERATION
TRY TO LOCATE THE TROUBLE BY USING EYES, EARS
LOCALIZE THE TROUBLE TO THE FAULTY SECTION BY
LOCALIZE THE TROUBLE TO THE FAULTY STAGE BY
LOCALIZE THE TROUBLE TO THE FAULTY COMPONENT
BY TESTING TECHNIQUES
REPLACE OR REPAIR THE DEFECTIVE COMPONENT
PERFORM SYSTEM OPERATION