Aviation Maintenance Technician Handbook—Powerplant: by Federal Aviation Administration (FAA)/Aviation Supplies &

By Federal Aviation Administration (FAA)/Aviation Supplies & Academics (ASA)

This new FAA AMT Handbook—Powerplant (Volume 1 and 2) replaces and supersedes Advisory round (AC) 65-12A. thoroughly revised and up to date, this guide displays present working tactics, rules, and equipment.

This e-book used to be built as a part of a sequence of handbooks for people getting ready for mechanic certification with airframe or powerplant scores, or either — these looking an Aviation upkeep Technician (AMT) certificates, also referred to as an A&P license. a good textual content for either scholars and teachers, this instruction manual also will function a useful reference consultant for present technicians who desire to enhance their knowledge.

Powerplant quantity 1: plane Engines, Engine gasoline and gas Metering structures, Induction and Exhaust structures, Engine Ignition and electric platforms, Engine beginning Systems

Powerplant quantity 2: Lubrication and Cooling structures, Propellers, Engine elimination and substitute, Engine hearth safeguard platforms, Engine upkeep and Operation, Light-Sport plane Engines

Includes coloured charts, tables, full-color illustrations and pictures all through, and an intensive thesaurus and index.

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Extra info for Aviation Maintenance Technician Handbook—Powerplant: FAA-H-8083-32 Volume 1 / Volume 2

Example text

Figure 1-35] Exhaust open Valves closed Operating Cycles There are several operating cycles in use: 1. Four stroke 2. Two stroke 3. Rotary 4. Diesel Four-Stroke Cycle The vast majority of certified aircraft reciprocating engines operate on the four-stroke cycle, sometimes called the Otto 1-26 C Power stroke Figure 1-36. Four-stroke cycle. D Exhaust stroke One complete actual cycle of a four-stroke cycle reciprocating engine erla ov e v l Va p 75 ° both valves ope n Finish cycle 25° ATC Exhaust valve closed r stroke stroke Intake valve closes 30° ABC ake Start cycle 50° BTC Intake valve opens we Po ression stro mp ke Co n Int st stroke Exhau itio Ign Exhaust valve opens 30° BBC BTC = before top center ATC = after top center ABC = after bottom center BBC = before bottom center Figure 1-37.

The portion of the lobe that gently starts the valve operating mechanism moving is called a ramp, or step. The ramp is machined on each side of the cam lobe to permit the rocker arm to be eased into contact with the valve tip and thus reduce the shock load which would otherwise occur. The valve operating mechanism consists of a cam ring or camshaft equipped with lobes that work against a cam roller or a cam follower. [Figures 1-24 and 1-25] The cam follower pushes a push rod and ball socket, actuating a rocker arm, which in turn opens the valve.

When a true supercharger is used with the aircraft engine, the manifold pressure may be considerably higher than the pressure of the outside atmosphere. The advantage of this condition is that a greater amount of charge is forced into a given cylinder volume, and a greater output of horsepower results. Compression ratio and manifold pressure determine the pressure in the cylinder in that portion of the operating cycle when both valves are closed. The pressure of the charge before compression is determined by manifold pressure, while the pressure at the height of compression (just prior to ignition) is determined by manifold pressure times the compression ratio.

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