A-2
IO-240 Series Engine Installation & Operation Manual
31 October 2011
Glossary
A-2. Glossary
POH
Pilot’s Operating Handbook
PMA
Parts Manufacture Approval
RMS
Root Mean Square
RPM
Revolutions per Minute
SB
Service Bulletin
SID
Service Information Directive
SIL
Service Information Letter
STANAG
Standardization Agreement (STANAG)
STC
Supplemental Type Certificate
TBO
Time Between Overhauls
TC
Type Certificate
TDC
Top Dead Center
TIT
Turbine Inlet Temperature
TSO
Technical Standard Order
TSMOH
Time Since Major Overhaul
WOT
Wide Open Throttle
Term
Definition
Airworthiness Approval Tag
FAA Tag 8130-3 that identifies a part or group of parts that has been
deemed airworthy by an authorized FAA representative.
Burning
In reference to the engine valves, indicates roughening or erosion due to
high temperature gases escaping past valve faces. In other instances, it
indicates drawing of the temper of steel parts to a soft (blue) condition, as
a result of overheating, during an absence of lubrication on moving
surfaces, such as gear teeth subject to high loading.
Burr
Sharp or rough projection of metal.
Chafing
Condition caused by a rubbing action between adjacent or contacting
parts under light pressure which results in wear.
Crack
Partial separation of material usually caused by vibration, overloading,
internal stresses, improper assembly, or fatigue.
Critical Service Bulletin
Service document based on determination by the product manufacturer
to constitute a threat to continued safe operation of an aircraft or to
persons or property on the ground unless the owner or operator takes
some specific action (inspection, repair, replacement, etc.). Documents in
this category are candidates for incorporation into an Airworthiness
Directive issued by the FAA.
Dent
Rounded depressed, pushed-in area on a surface.
Acronym
Definition
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