Glossary
Teledyne Continental Motors, Inc.
TM
A-6
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
Term Definition
Health Status
Annunciator
A cockpit-mounted indicator panel used by the FADEC System to convey system
condition information to the pilot.
Hydraulic Lock
Condition where fluid accumulates in the induction system or the cylinder
assembly. The liquid restricts the piston from traveling during the compression
stroke. Damage to the engine occurs when the other cylinders fire, which forces
the piston in the fluid-filled cylinder through the compression stroke. Damage to
an engine from hydraulic lock can be extensive due to the extreme stress load
and can adversely affect connecting rods, pistons, cylinder assemblies, piston
pins, the crankcase, and the crankshaft.
Mandatory Service
Bulletin
Service document relating to known or suspected hazards to safety that have
been incorporated in whole or in part into an Airworthiness Directive (AD) issued
by the FAA, or have been issued at the direction of the FAA by the manufacturer
requiring compliance with an already-issued AD (or an equivalent issued by
another country’s airworthiness authority).
Nick
Sharp-sided gouge or depression with a V-shaped bottom.
Peening
Series of blunt depressions in a surface.
Pitting
Formation of pockets of corrosion products on the surface of a metal.
Primary Power
Primary electrical power supply to the FADEC System. It is supplied by the
aircraft’s primary electrical bus.
Primary Power
Circuit Breakers
Circuit breakers used to protect the FADEC System’s primary power supply.
Primary Power
Switch
Switch used for interrupting the primary electrical power supply to the FADEC
System.
Propeller Strike
Any incident that requires repair (other than minor dressing of the blade) to a
propeller blade. Either the propeller strikes an object or an object strikes the
propeller and causing a propeller imbalance. Propeller strikes are serious
because they can result in engine failure. Even if the propeller still continues to
rotate, other components critical to engine operation may be damaged.
Push-to-Test Button
Button on the HSA panel for conducting a lamp test. Depressing this button
initiates an HSA lamp test.
Runout
Eccentricity or wobble of a rotating part; eccentricity of two bored holes or two
shaft diameters; a hole or bushing out of square with a flat surface. Runout is
usually measured with a dial indicator, and limits stated indicate full deflection of
indicator needle in one revolution of part or indicator support.
Scoring
Deep grooves in a surface caused by abrasion from fine hard particles wedged
between moving surfaces, as in a bearing and journal, or caused by galling when
a moving part is not supplied with lubricant.
Secondary Power
Secondary electrical power supply to the FADEC System. It is supplied by the
Secondary Power Source.
Secondary Power
Circuit Breakers
Circuit breakers used to protect the FADEC System’s secondary power supply.
Secondary Power
Source
Redundant electrical power source for the FADEC System. It may be an engine-
driven device, such as an alternator or it may be a battery.
