Digital Avionics and Instruments Flashcards
7 cards from real AME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Digital Avionics and Instruments flashcards as text
In an ARINC 429 data word, which bits contain the label that identifies the data type?
Answer: Bits 1-8
The ARINC 429 label occupies bits 1-8 and is coded in octal to identify the parameter being transmitted.
What type of parity does an ARINC 429 word use in bit 32?
Answer: Odd parity
Bit 32 is set so that the total number of logic 1s in the 32-bit word is odd.
Which statement correctly describes data flow on an ARINC 429 bus?
Answer: Unidirectional, one transmitter to up to 20 receivers
ARINC 429 is a simplex bus where a single transmitter sends to as many as 20 receivers.
What is the high-speed data rate specified for ARINC 429?
Answer: 100 kbps
ARINC 429 runs at 100 kbps in high-speed mode and 12.5-14.5 kbps in low-speed mode.
On a MIL-STD-1553 data bus, which device initiates all data transfers?
Answer: Bus controller
MIL-STD-1553 uses command/response protocol in which the bus controller commands every transfer.
Which encoding method is used on a MIL-STD-1553 data bus?
Answer: Manchester II bi-phase
MIL-STD-1553 transmits at 1 Mbps using Manchester II bi-phase encoding, which is self-clocking.
ARINC 664 Part 7 (AFDX) networks guarantee deterministic bandwidth by using which concept?
Answer: Virtual links
AFDX assigns each data flow a virtual link with a defined bandwidth allocation gap so delivery is deterministic over switched Ethernet.