POWERPLANT AND OVERHAUL TROUBLESHOOTING PRELIM EXAM REVIEWER

The three primary controls for reciprocating engines

throttle, propeller, and mixture

COLOR ARCS
are the most widely used instrument markings; they usually indicate a safe or normal range of operation.

Green arcs or lines

COLOR ARCS
indicates a caution range for limited operation.

Yellow arc or line

COLOR ARCS
indicates a restricted operating range where excessive vibration or other stresses could endanger the engine or the airframe.

Red arc

is measured at the carburetor inlet by a temperature sensing bulb in the ram air intake duct. The primary purpose of a CAT gauge is to indicate when carburetor ice might form.

CARBURETOR AIR TEMPERATURE GAUGE

displays the pressure of fuel supplied to the carburetor or fuel control unit.

FUEL PRESSURE GAUGE

measures the rate of fuel that an engine burns, expressed in gallons or pounds per hour. This is the most accurate indicator of engine fuel consumption.

FUEL FLOW INDICATOR

measures the absolute pressure of the fuel/air mixture within the intake manifold. 

MANIFOLD PRESSURE GAUGE

enables pilots to monitor the temperature of the oil entering the engine

OIL TEMPERATURE GAUGE

enable pilots to monitor the engine lubrication system.

OIL PRESSURE GAUGE

that enables pilots to monitor the temperature of at least one of the cylinders.

CYLINDER HEAD TEMPERATURE GAUGE

measures the temperature of the exhaust at some point past the exhaust port. Because the fuel/air mixture setting directly affects combustion temperature, pilots can use an ______________ to set the mixture for the best power or fuel economy.

EXHAUST GAS TEMPERATURE GAUGE

displays the revolutions per minute (RPM) of the engine crankshaft. This primary engine instrument, together with the manifold pressure gauge on airplanes with a constant speed propeller, provides a means by which to monitor and set engine performance.

TACHOMETER

(TRUE or FALSE) Before starting the engine, avionics master(off)?

TRUE

(TRUE or FALSE) Before starting the engine, open the fuel drain(7seconds)?

FALSE (5seconds)

(TRUE or FALSE) Before starting the engine, Fuel Shut Off Valve (Close)?

FALSE (OPEN)

Engine Start
1.Mixture (Rich or Lean)??

2. Carburetor Heat (Hot or Cold)??

3. Prime (2 times is required or 4 times is required)??

4. Throttle (1/2 inch open or 1/4 inch open)??

5. Propeller Area (Clear)

6. Brakes (Apply)

7. Master Switch (On or Off)??

8. Beacon Light (On or Off)??

9. Hands on the Throttle Control, other on the ignition key

10. Brakes (Apply)

11. Ignition Switch (Start)

1.Mixture (Rich or Lean)

2. Carburetor Heat (Hot or Cold)

3. Prime (2 times is required or 4 times is required)

4. Throttle (1/2 inch open or 1/4 inch open)

5. Propeller Area (Clear)

6. Brakes (Apply)

7. Master Switch (On or Off)

8. Beacon Light (On or Off)

9. Hands on the Throttle Control, other on the ignition key

10. Brakes (Apply)

11. Ignition Switch (Start)

TACHOMETER
In starting Adjust Throttle for __________ for ____________ or until oil temp reaches green arc.

1200rpm, 7mins

TACHOMETER
Check Oil Pressure for how many secs?
A. 20 secs
B. 30 secs
C. 40 Secs.

B. 30 secs

TACHOMETER
Ammeter (_________)

Normal reading

TACHOMETER
Low voltage warning light (on or off)?

OFF

TACHOMETER
After 7 mins.

1.Oil pressure (within green arc)

2.Oil temperature (within green arc)

3.CHT (within green arc)

MAGNETO DROP CHECK
How many RPM for Magneto Drop Check?

2000rpm

Set Tachometer 2000rpm for Magneto drop check:

1. Left Magneto (25rpm-175rpm) 5 sec check

2 Left Magneto (25rpm-175rpm) 5 sec check

3. Carbheat (25rpm-175rpm) 5 sec check

4. Oil Pressure, Oil Temp, CHT (within green arc)

Set Tachometer for Static power (FULLY OPEN):
1. Static Power for how many secs?
2. What Gauge do we check?
3. Oil Pressure, Oil Temperature, CHT (within green arc).

1. Static Power (5 seconds)

2 Suction Gauge (within green arc)

3. Oil Pressure, Oil Temperature, CHT (within green arc)

Set Tachometer for Static power (FULLY OPEN):
1. Idle Power for how many secs?

2. Carbheat (25rpm-100rpm) for how many secs?

3. Oil Pressure, Oil Temperature, CHT (within green arc)

1. Idle Power (5 seconds)

2. Carbheat (25rpm-100rpm) 5 seconds check

3. Oil Pressure, Oil Temperature, CHT (within green arc)

Engine Shut Off:
1. Gradually increase the power to how many rpm for 15-20 sec (observe engine response)??

1800rpm

Engine Shut Off:
2. Reduce the power to _________ for __________.

1200rpm, 5 sec

What kind of light do we switch on when starting the engine?

BEACON LIGHT

What happen when you let the carb heat in a hot position?

It will lead to detonation.

Improper Engine Shutdown and to much heat will lead to______?

VAPOR LOCK

What to do when a vapor lock occurred?

Open Shut Off Valve and Fully Open the Throttle

When you are above the ground and there is an air leak what will happen to the Manifold Pressure Gauge?

The manifold system showing a wild momentary increase

When you are in the ground and there is an air leak what will happen to the Manifold Pressure Gauge?

The manifold system showing a wild momentary decrease

In Magneto Drop Check:

When the RPM drop quickly or fast it indicates……??

A malfunction in wirings(High Tension Wire) or in Spark Plug.

In Magneto Drop Check:

When the RPM drop slowly it indicates……??

There is a Problem in Magneto Timing.

In Magneto Drop Check:

When the RPM didn’t drop it indicates……??

A Grounded wires.

In oil 172 is equal to how many quartz?

8quartz

In oil 152 is equal to how many quartz?

6quartz