Esterline CMA-9000 - Inertial Navigation in Polar Area; Irs System Pages

OPERATOR’S MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
Page 12-10
August 17, 2010
IRS SYSTEM PAGES
There are no data entries on these pages except when in ALIGN mode. For additional information refer to
Appendix A.
1. Display the IRS STATUS 1/1 page by pressing [INIT REF], <NAV STATUS> and <IRS>.
Page displayed for LASEREF_V:
INERTIAL NAVIGATION IN POLAR AREA
When the system mixed inertial latitude exceeds 85 degrees N or S, the FMS will cease to compute a mixed
inertial position. The system inertial position will slowly transition to coincide with the position of the inertial
sensor closest to the mixed inertial position computed before the FMS present position latitude exceeded N-S
85 degrees.
The true heading, inertial track and ground speed information used by the FMS will be taken from the nearest
IRS. The other inertial sensor(s) will be automatically rejected. If the selected nearest inertial sensor fails, the
system will select the next nearest inertial sensor.
Upon an automatic rejection of an inertial sensor, the character string “
REJ” will be displayed in lower case on
the POS REF 2/2 page, adjacent to the rejected sensor.
Upon aircraft position latitude is less than N-S 85 degrees, the rejected inertial sensor(s) will be automatically re-
enabled and the FMS will re-start the computation of the mixed inertial position, track and ground speed.
1R
2R
3R
4R
5R
IRS1 STATUS 1/1
POSITION
N45
o
34.25 W122
o
45.12
MODE
NAV
HDG/DA TK/GS
060
o
/ R99
o
045
o
/140KT
PITCH/ROLL ALT
D15
o
/ R10 5000FT
VERT SPD
+175
FT/MIN START TEST>
<NAV STATUS ACCURACY>
1L
2L
3L
4L
5L
6L 6R
DRAFT