T-45A UJPT, E2-C2, ADV, & IUT Eng-19
Flight Instruments
PROGRESS CHECK
Question 1 -- 1.4.5.2.1
What is the warmup time for the SAHRS?
ANSWER: 120 seconds
Question 2 -- 1.4.5.3
What does the OFF flag on the ADI indicate?
ANSWER: Either the instrument has failed, electrical
power to the ADI has failed, or SAHRS input is invalid.
Question 3 -- 1.4.5.2
What electrical buses supply power to the ADI and
HSI?
ANSWER: 115 VAC essential and nonessential
buses, 28 VDC generator bus, and 26 VAC essential
bus
NOTE: Explain pre- and post-AFC-246 difference.
Question 4 -- 1.4.5.2.1
How long does the fast erection of the 3-inch
standby AI gyro take?
ANSWER: 45 seconds
Question 5 -- 1.4.5.2.1
What type of output is provided by SAHRS when
the SLV mode is selected on the mode control
panel?
ANSWER: Gyro-stabilized, magnetic heading
(8-03) Original
Page 19-37
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