Lab 5 Reciprocating Engine Operation
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Apr 3, 2024
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Jordy Keurntjes
AVS 1235
Project #5
Aircraft Reciprocating Engine Operation
Purpose:
Describe the controls and instrumentation associated with reciprocating engines. Interpret
engine instrument information.
Reference: Aircraft specific POH
Activities:
Part 1: Reciprocating Engine Controls
1)
Identify the engine controls in figure 1. (Cirrus SR20)
Power lever Mixture control
Start/ignition switch
2)
Identify the engine controls in figure 2. (Piper Seminole)
Throttle Propellor control
Mixture control lever
3)
The power lever in the Cirrus SR20 is linked to the butterfly valve/fuel metering unit and the propeller pitch control
4)
The power lever in the Cirrus SR20 is designed to maintain 2500 RPM during cruise with
a maximum RPM of 2700
5)
Pushing the propeller levers full forward in the Seminole will put the engine at High (HIGH or LOW) RPM.
Jordy Keurntjes
Part 2: Reciprocating Engine Instrumentation
1)
Identify the engine instruments on figure 3. (Cirrus SR20)
2)
Identify the engine instruments on figure 4. (Piper Seminole)
3)
At what temperature will the SR20 MFD illuminate “Check CHT” in yellow?
420 degrees 4)
At what temperature will the SR20 MFD illuminate “Check CHT” in red?
460 degrees 5)
In the Cirrus SR20, oil pressure may drop to 10 psi during engine idle.
6)
At what temperature will the SR20 MFD indicate “Check Oil Temp” in a red advisory box?
240 degrees 7)
What six parameters are used to calculate percent power in the Cirrus SR20?
Manifold pressure, indicate air speed, outside air temperature, pressure altitude, engine speed, fuel flow Part 3: Questions
1)
What engine instrument is the main indicator of engine temperature?
Cylinder head temperature 2)
What engine instrument is an indicator fuel mixture and combustion efficiency?
Exhaust gas temperature 3)
Which engine instrument indicates engine rotational speed?
Tachometer
Jordy Keurntjes
4)
Which engine instrument is the indicator for power output?
Manifold pressure 5)
Reciprocating engines are stopped using what engine control?
Mixture 6)
How is power output of an aircraft reciprocating engine related to outside air temperature?
Low temperature is better performance 7)
What effect would a high humidity day have on the takeoff roll of an aircraft with a reciprocating engine?
Higher density altitude decreased performance 8)
What are the units used on a manifold air pressure (MAP) gauge?
This would be in HG
9)
MAP will typically decrease by 1000 for every 1000 feet of altitude gained.
10) What is the term used to describe the altitude where the throttle on the engine is fully open and the desired power setting cannot be maintained?
This would be at a critical altitude 11) What causes thermal shock of an aircraft reciprocating engine?
Rapid throttle and altitude changes
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