IRS Flashcards
1
Q
IRS system display unit is powered by
A
28V DC from left and right IRU/ADIRU
2
Q
Normal power source for IRS 1
A
115V AC standby bus
3
Q
Normal power for IRS 2
A
115 V AC transfer bus
4
Q
Alternate power for both IRS’s
A
28V Switched hot battery bus
Left until <18V, Right for 5min
5
Q
After turning IRS off wait
A
30sec before powering down aircraft
6
Q
ALIGN light will flash for what reasons
A
- Aircraft movement (automatically restarts)
- Significant difference between present and entered position
- Unreliable present position entry
- Requires present position
7
Q
DC LIGHT illuminates
A
- Battery power is insufficient (<18V)
- Both DC FAIL = switched battery bus is not powered or batt is nearly dead
- Cannot start APU
8
Q
When parked residual ground speed should be
A
Less than 20kts
9
Q
IRS tolerance
A
3 + 3 T (T is time in hours)
