ENGINE INSTRUMENT SYSTEMS

Topics: Thermodynamics, Pressure measurement, Measuring instrument Pages: 3 (1416 words) Published: April 16, 2015
ENGINE INSTRUMENT SYSTEMS
I. Introduction
A. Purpose – measure and indicate the operation of the engine B. Measuring (or sensing) and Indicating
1. Measuring – sending unit or sensor detect temperature, pressure, speed, etc. 2. Indicating – indicating unit or gauge displays data for the operator to use 3. Examples – engine instrument systems include:

a. Tachometer – indication of engine crankshaft speed in Rpm b. Manifold absolute pressure (MAP) – indication of pressure in the induction system (intake manifold or valve) in inches of mercury c. Oil pressure – indication of oil pressure in main galley, after pump, in psi d. Oil temperature – indication of oil temperature, after the oil cooler e. Cylinder head temp (CHT) – indication of (hottest) cylinder temperature f. Fuel pressure – indication of fuel pressure, typically in psi g. Fuel flow – indication of rate of fuel flow/”burn” in gal or lbs. per hour h. Exhaust gas temperature (EGT) – indication of (hottest) cylinder exhaust i. Carburetor air temperature (CAT) – indication of temperature in carburetor j. Turbine inlet, outlet, or interstage temps (TIT, TOT, ITT) – indicate turbine gas flow temperatures II. Requirements (14 CFR 23)

A. Markings
1. Radial line – indicates minimum or maximum limits
2. Arc – indicates an allowable operational range
3. Typically directly on instrument face, but may be painted on the instrument glass 4. Index mark – white mark on glass, “slippage marks” (used where color markings are on the glass), extends from glass onto case B. Colors

1. Green arc – safe, or normal range of operation
2. Blue line/arc – allowable value under special operating conditions 3. Yellow arc – caution range, typically -time or -condition limited operation 4. Red radial/line – unsafe, maximum or minimum safe operating limits C. AMT Privileges – as related to instruments themselves – very limited 1. “steam Gauges/ Round Dial”

a. Can inspect for installation, condition, mounting, marking and...
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