TB 1--1520--251--20--03
CAUTION
The pilot will insure that both EGIs have aligned properly and are displaying
the same position, heading, position confidence values, valid date, time and
GPS tracking. This will prevent erroneous velocity data signals from the
EGIs being sent to the flight management computer (FMC), which should
prevent an uncommanded scheduling of the stabilator.
NOTE
If one or both of the EGIs displays a position error greater than one nautical
mile from the aircraft's known position or if the date and time is incorrect,
perform the on ground manual reset and alignment procedure. Longitude
and latitude are displayed in degrees, minutes and 100ths of minutes; one
minute equates to approximately one mile.
(b) 8.16B on ground manual reset and alignment procedures.
1. Current position -- load into KU.
2. INU 1 and INU 2 -- reset. Check TSD page for the HDG selection displayed.
3. PSN -- select.
4. POS -- select.
5. KU enter button -- press.
NOTE
If HDG selection is not displayed or is removed while the current position
data is being entered, perform an INU 1 and INU 2 reset and then quickly
(within one minute) re--enter the current position.
6. UPT -- select.
7. Time -- select. Enter current Zulu time.
8. Date -- select. Enter current Zulu date.
(2) Urgent change to TM 1--1520--251--CL page N--10 and TM 1--1520--251--MTF, page
2--38.1/(2--38.2 Blank), add --
(a) **EGI Operational Check Pilot/CPG.
1. TSD and flight page -- select.
2. Heading, attitude, and position verify.
3. TSD utility page -- select. Note position confidence value, verify current date and time.
4. Secondary EGI -- select as primary. Note position confidence value, verify current
date and time.
5. TSD page -- select.
6. PP button -- select. Verify position.
7. TSD utility -- page select EGI with lowest position confidence value as primary.
NOTE
If one or both of the EGIs displays a position error greater than one nautical
mile from the aircraft's known position or if the date and time is incorrect,
perform the on ground manual reset and alignment procedure.
(b) *On ground manual reset and alignment.
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