Lab 5 Reciprocating Engine Operation
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Western Michigan University *
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1225
Subject
Mechanical Engineering
Date
Dec 6, 2023
Type
Pages
7
Uploaded by DrRain11747
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)
2)
Identify the engine controls in figure 2. (Piper Seminole)
3)
The power lever in the Cirrus SR20 is linked to the butterfly valve/fuel metering unit and
the __prop 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.
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
Indicated air speed
Outside air temp
Engine speed
Fuel flow
Pressure altitude
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 temp
3)
Which engine instrument indicates engine rotational speed?
Tachometer
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?
Higher temperature causes worse performance and lower temperature causes better performance
7)
What effect would a high humidity day have on the takeoff roll of an aircraft with a
reciprocating engine?
Takeoff roll is increased
8)
What are the units used on a manifold air pressure (MAP) gauge?
Inches of mercury or Hg
9)
MAP will typically decrease by __________ for every 1000 feet of altitude gained.
1 hg
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?
Critical attitude
11) What causes thermal shock of an aircraft reciprocating engine?
Rapid throttle changes
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