OPERATOR’S
MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
Page
12-25
November 19, 2009
INERTIAL NAVIGATION MODE
The purpose of the FMS/inertial sensors interface is to provide a stand-alone inertial navigation mode for use
when stand-alone GPS navigation and radio navigation are not possible.
Reversion to the inertial navigation mode is automatic upon loss of GPS and radio navigation.
Depending on the inertial sensors installed in the aircraft, the FMS will receive and process ARINC 704/571/419
inertial data which may include position, ground speed, altitude, E-W and N-S inertial velocities, baro-inertial
altitude, true and synthetic magnetic heading, status and maintenance data.
The inertial navigation mode is based on the FMS-calculated mixed inertial position, track and ground speed.
The mixed inertial position is computed as a weighted average of the three inertial sensor positions.
When in GPS or DME navigation mode and the ANP is within the phase of flight limit, each FMS calculates a
bias vector between its system position and the mixed inertial position.
When the inertial navigation mode becomes active, the mixed inertial position is corrected with the bias vector in
order to prevent large FMS position change.
The actual navigation performance (ANP) of the mixed inertial position is derived from the inertial drift rate, the time
elapsed since inertial navigation mode became active, and the system ANP when the inertial navigation mode
became active. The FMS computes an inertial ANP based on a drift rate of 2 nautical miles per hour of inertial
navigation.
1. Display the IRS STATUS 1/X page by pressing [INIT REF], <NAV STATUS> (LSK 5R) and <IRS> (LSK
4R).
A. LTN_92
installation:
1 R
2 R
3 R
4 R
5 R
6 R
IRS1 STATUS 1/X
P O S I T I O N
N 4 5
o
3 4 . 2 5 W 1 2 2
o
4 5 . 1 2
M O D E P G M N U M B E R
N A V 9 2 - 0 4 - 1 3
H D G / D A T K / G S
0 6 0
o
/ L 1 5
o
0 4 5
o
/ 1 4 0
K T
P I T C H / R O L L A L T
D 1 5
o
/ R 1 0
o
5 0 0 0
F T
V E R T S P D
+ 1 7 5
F T / M I N
MALFUNCT
>
<
NAV STATUS ACCURACY
>
1 L
2 L
3 L
4 L
5 L
6 L
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