EFFECTIVITY
ALL CFM56 ENGINES
CFMI PROPRIETARY INFORMATION
CFM56-ALL TRAINING MANUAL
INTRODUCTION
BORESCOPE INSPECTION
Page 20
Sep 03
SCHEDULED / UNSCHEDULED INSPECTION
These are the 2 basic types of borescope inspections.
- Scheduled inspection
- Unscheduled inspection
Scheduled
The purpose of the scheduled inspection is to inspect
for defects inside the engine at regular time intervals,
depending on :
- the Maintenance Review Board (MRB)
- the Maintenance Planning Document (MPD).
A scheduled inspection is performed on specic areas of
the engine to assess its condition.
If no defects are found, the engine is serviceable.
If defects are found, refer to the AMM to nd out if the
engine is serviceable, with or without cycle limitations.
As a supplement, refer to the Non Destructive Test
Manual (NDTM). In the On Condition paragraph of each
engine section, there is a list of possible defects.
Unscheduled
The purpose of the unscheduled inspection is to nd
defects inside the engine at abnormal time intervals, or
after an engine event, such as FOD, hot start, overspeed,
vibration, etc...
If an engine experiences such a problem, it may have to
be inspected to ascertain internal defects.
During an unscheduled inspection, all areas of the engine
may be inspected.
As a supplement refer to the NDTM. The AMM, engine
section, special inspection, will list the engine events and
which inspection ports must be used by the inspector.
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