Powerplant - Aero Guide

Troubleshooting Guide for Aircraft Propeller Systems

Even with regular maintenance, propeller systems may develop operational problems due to wear, improper adjustments, contamination, or component failure. Effective troubleshooting begins by identifying the symptoms, determining whether the problem originates in the propeller or engine, and systematically inspecting the affected components. NOTE: The following troubleshooting examples describe common propeller problems and their possible causes. … Read more

Turbofan Powerplant QECA Removal

The powerplant may be removed from the aircraft by either of two methods. One method involves lowering the powerplant from the nacelle by using an engine dolly. The other method requires hoists and a special sling to lower the powerplant to a movable engine stand. The following preliminary steps are applicable to either method of … Read more

Installation of Turbofan Engines

Installation With Dolly The following procedures are typical of those used to install a turbofan engine using a dolly. Specific ground-handling instructions are normally placarded on the dolly. Operate the dolly and carefully raise the engine to the engine mount attaching fittings. Align the rear engine mount with the mount attaching fittings. Install the engine … Read more

Inspection and Replacement of Aircraft Powerplant External Units and Systems

The engine nacelle must be cleaned thoroughly before it is inspected. The design of an engine nacelle varies with different aircraft. Basically, it is a framework covered with removable cowling, in which the engine is mounted. This assembly is attached to the aircraft and incorporates an insulating firewall between the engine and the airframe. The … Read more

Turboprop Powerplant Removal and Installation

Since most turboprop powerplant removal and installation instructions are developed for QECA, the following procedures reflect those used for a typical QECA. The procedures for turboprop engine removal and installation are similar to those presented in the section of this chapter for turbojet engines, except for those systems related to the turboprop propeller. Open the … Read more

Aircraft Turbine Engine EGT System and Tachometer System Troubleshooting

Troubleshooting EGT System An appropriate analyzer is used to test and troubleshoot the aircraft thermocouple system at the first indication of trouble, or during periodic maintenance checks. The test circuits of the analyzer make it possible to isolate the troubles listed below. Following the list is a discussion of each trouble mentioned. One or More … Read more

Aircraft Turbine Engine Shutdown

On turbine engines that have a thrust reverser, retarding the aircraft throttle to idle or power lever to OFF cuts the fuel supply to the engine and shuts down the engine. On engines equipped with thrust reversers, this is accomplished by means of a separate fuel shutoff lever or switch. When an engine has been … Read more

Reciprocating Engine Ignition Maintenance and Inspection

An aircraft’s ignition system is the result of careful design and thorough testing. The ignition system usually provides reliable service when it is properly maintained and inspected. However, normal wear and deterioration can affect ignition system performance, particularly in magneto-ignition systems. Possible defects associated with magneto-ignition systems include deterioration of insulating materials, breaker point wear, … Read more

Basic Aircraft Fuel System

The basic components of an aircraft fuel system include fuel tanks, booster pumps, fuel lines, selector valves, strainers, engine-driven pumps, and pressure gauges. Generally, there are several tanks, even in a simple system, to store the required amount of fuel. The location of these tanks depends on both the fuel system design and the structural … Read more

Auxiliary Ignition Systems for Reciprocating Engines

Auxiliary ignition units are used to improve ignition during reciprocating engine starting, when low cranking speed may prevent a magneto from producing sufficient voltage for reliable spark plug firing. These systems provide a stronger starting spark while retarding ignition timing to help prevent engine kickback. Common auxiliary ignition systems include booster coils, impulse couplings, and … Read more