AME Digital Avionics and Instruments 2

Question 1

In an ARINC 429 data word, which bits contain the label that identifies the data type?

Accepted Answer

Bits 1-8

Answer

The ARINC 429 label occupies bits 1-8 and is coded in octal to identify the parameter being transmitted.

Question 2

What type of parity does an ARINC 429 word use in bit 32?

Accepted Answer

Odd parity

Answer

Bit 32 is set so that the total number of logic 1s in the 32-bit word is odd.

Question 3

Which statement correctly describes data flow on an ARINC 429 bus?

Accepted Answer

Unidirectional, one transmitter to up to 20 receivers

Answer

ARINC 429 is a simplex bus where a single transmitter sends to as many as 20 receivers.

Question 4

What is the high-speed data rate specified for ARINC 429?

Accepted Answer

100 kbps

Answer

ARINC 429 runs at 100 kbps in high-speed mode and 12.5-14.5 kbps in low-speed mode.

Question 5

On a MIL-STD-1553 data bus, which device initiates all data transfers?

Accepted Answer

Bus controller

Answer

MIL-STD-1553 uses command/response protocol in which the bus controller commands every transfer.

AME - Aircraft Maintenance Engineer Practice Test