1) To monitor a set of 4 signals, a T-harness is placed inline at a convenient l
ID: 1714810 • Letter: 1
Question
1) To monitor a set of 4 signals, a T-harness is placed inline at a convenient location. Signals pass through J1 to P1; J2 is connected to a National Indtruments IO interface box.
B) This T-harness is also used in a different location to montor thestatus lines for LR/RH ECU & alternator fault indicators. P! is connected to four LEDs on an indicator panel. The LED's require a minimum of 8mA of current to light, 14mA nominally. The LEDs are powered by aircraft 28V through sk Ohm current limiting resistors. The ECU and alternator fault pins are Open/GND, GND when there is fault. To monitor these signals, you connect J2 to an NI analog IO board. Its input impedance is low, around 1k OHm. How will the LEDs behave?
C) You see the correct voltage differential between pins 1 & 2 on J@ but not on pins 1 & 2 on J1. What troubleshooting steps would you take to solve the issue?
2) A customer will be visiting for an overview of an autonomous airplane in 3 days. We are planning to show off an auxiliary feature for remote control of an APU engine start.
A) The APU has redundant speed inputs
B) the APU controller has some unknown selection criteria for which input it selects.
C) the controller costs $13,000
D) The software team just pulled an all-night to get the software load that runs the controller.
In your first engine crank, the engine turns over an stops after 5 seconds. The built-in-test now shows a fault. You have a spare APU controller.
Outline what troubleshooting approach you would take in the first 2 hours. Despite your quick trobleshooting, you can't not find a failure. What is your next step? Please write a 6 line email to the program Manager justifying your desision.
P1 J1 J1 2Explanation / Answer
A)
In the whole network only one node can transmit data to the bus at any one moment and all other nodes must be in receiving status. If there are two or more nodes transmitting data to the bus at the same time, all transmission fails
A special communication cable is needed. The maximum communication distance depends on communication cable type.
In the whole network only one node can transmit data to the bus at any one moment and all other nodes must be in receiving status. If there are two or more nodes transmitting data to the bus at the same time, all transmission fails
A special communication cable is needed. The maximum communication distance depends on communication cable type.
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