Fuel Metering
What Effect does high atmospheric humidity have on the operation of a jet engine?
It has little or no effect
How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?
A high-energy spark is required for ignition.
The purpose of an under current relay in a starter-generator system is to
To disconnect power from the starter-generator and ignition when sufficient engine speed is reached.
What type of oil system is usually found on turbine engines?
Dry sump, pressure, and spray.
The breaking loose of small pieces of metal from coated surfaces, usually caused by defective plating or excessive loads, is called
flaking.
Prior to performing engine trimming, what should you do?
Obtain a true temperature reading comparable to that of the air that enters the engine.
Why do turbine engine ignition systems require high energy?
To ignite the fuel under conditions of high altitude and low temperatures.
The primary advantage of pneumatic (air turbine) starters over comparable electric starters for turbine engines is
High power-to-weight ratio.
The recommended aircraft engine lubricants are
Mineral or synthetic based.
What publication is used for guidance to determine whether a powerplant repair is major or minor?
14 CFR part 43.
The active clearance control (ACC) portion of an EEC system aids turbine engine efficiency by
Ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures.
Sharp bends should be avoided in ignition leads primarily because
Weak points may develop in the insulation through which high tension current can leak.
Airflow to the pneumatic starter from a ground unit is normally prevented from causing starter over-speed during engine start by
Activation of a flyweight cutout switch.
In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a
relief valve.
What publication contains the mandatory replacement time for parts of a turbine engine?
Engine Manufacturer's service instructions.
A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and
Develops the commands to various actuators to control engine parameters.
Igniter plugs used in turbine engines have a long service life because they
Do not require continuous operation.
In the event a pneumatic start valve will not operate and the manual override must be used, the starter T-handle must be closed at scheduled starter drop out because
The starter will over-speed at a given N^2.
What is the purpose of the last chance oil filters?
To filter the oil immediately before it enters the main bearings.
When must an Airworthiness Directive (AD) be complied with after it becomes effective?
As specified in the AD.
In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the
Increase direction.
Generally, when removing a turbine engine igniter plug, in order to eliminate the possibility of the technician receiving a lethal shock, the ignition switch is turned off and
The igniter lead is disconnected from the plug and the center electrode grounded to the engine after disconnecting the transformer-exciter input lead and waiting the prescribed time.
A safety feature usually employed in direct-cranking starters that is used to prevent the starter from reaching burst speed is the
Stator nozzle design that chokes airflow and stabilizes turbine wheel speed.
Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?
To provide a relatively constant oil flow to the main bearings at all engine speeds.
Which of the following conditions is usually not acceptable to any extent in turbine blades? Cracks?Pits? Dents?
Cracks.