Worksheet 56-Electrical to Mechanical Schematic Reading Flashcards
Using the electrical/mechanical schematic, what position is the relay in for the landing light when the light is retracted?
The relay for the landing light system is normally open.
What is used to determine the direction of the motor?
The motor uses a center tapped field wining that will drive the motor in opposite directions.
Describe all of the NO contacts when the light is retracted.
When the light has retracted, the relay for the light and the retract micro switch are open.
What is the switch type for the cockpit control?
The switch in the cockpit is a single pole double throw (SPDT).
When the switch is set to the extend position, what component(s) become energized right away?
As the extend switch is placed in the extend position, power travels immediately from the landing light relay.
What two conditions must be met before the light bulb will illuminate?
For the light to illuminate, the relay must be energized. The light must have moved far enough to make contact with the conducting contact bar.
How do you know that the light will move with the motor in this drawing?
You know that a part is mechanically connected when the drawing includes a dashed line between the two moveable components.
Refer to the magnetic motor brake, where does the voltage come from to release it?
Power for the magnetic brake must come through the brushes and the armature windings through the micro switches.
What is the electrical configuration of this motor?
The motor for this system is series wound. Field and armature circuits are in series.
The switch is turned on and nothing happens. You hear the relay actuate, you measure voltage coming out of the relay. What is the next component in the circuit that should have voltage?
If voltage is leaving the relay, there needs to be voltage past the extend micro switch.
You actuate the switch and the motor cycles fully down but the light never turns on. What is the first thing to test before dismantling the components?
If everything is working, then the light itself is the most obvious item to check.
When you actuate the switch, the motor begins to drive and the light illuminates. When the light becomes fully extended the motor is slowed down briefly and then the circuit breaker opens. What would cause the breaker to open?
When the light drives to the extend position, it relies on the opening of the extend microswitch to open and remove power from the motor. If the motor reaches its limits and is not powered down by the opening of the extend micro switch, the motor will pop the breaker.
When the pilot attempts to retract the light, the lamp goes out but the motor does not move. What would cause the light to go out but not allow the motor to retract?
Power for the retract motor must pass through the retract motor switch. Moving the switch to retract removes power from the light relay but the motor should drive. Check retract motor switch.
