Engine Operating Liminations

CHAPTER THREE

STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS

side of the pressure pump. The temperature arc has a numerical range from -5-15 (x10) and

indicates the temperature of the engine oil as it leaves the filter.

Fuel Consumed Totalizing Indicator

The fuel consumed totalizer indicator is located above the engine instruments. It combines fuel

flow information from the left and right fuel flow transmitters to produce a display of the

volume of fuel passing the transmitters. It does not indicate the actual amount of fuel consumed

by the engines.

314. ENGINE OPERATING LIMITATIONS

Refer to Instrument Markings and Engine Limitations, Section V, T.O. 1T-1A-1, for specific

engine limits.

315. ENGINE FIRE PROTECTION SYSTEM

Engine fire protections include fire and overheat detection systems and a fire extinguishing

system. Detection includes a self-test function. The crew controls the extinguishing.

Engine Fire Detection System

A semi-conductor, coaxial cable sensor element that forms a closed loop around all vital engine

components, provides detection. Should a fire or overheat condition occur, the rise in

temperature is detected by the sensor element, which illuminates the respective left or right fire

warning light and activates an audible fire warning.

Fire Detection System Test

The fire detection system is tested using the master test rotary switch located on the overhead

panel. Selection of either the right or the left engine position completes an electrical signal

through the respective fire detector control box simulating an engine fire condition. The

simulated fire condition causes the red fire detection switchlight for the selected engine to

illuminate and a fire warning tone to sound. Once the system is validated, the blue GO light

adjacent to the rotary switch will illuminate. If a fault exists in the detector control or the sensor

element is open or shorted, the red NO GO light adjacent to the rotary switch will illuminate.

Fire Warning Annunciator and Alarm

Two red fire warning switchlights, placarded LH ENG FIRE PUSH and RH ENG FIRE PUSH,

are located on the center shroud panel. These switchlights illuminate when an engine overheat or

engine fire condition is detected and are accompanied by a fire warning tone.

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ENGINES