OPERATOR’S
MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
Page
7-23
November 19, 2009
CAUTION:
In warm temperature conditions, the temperature compensated altitudes presented on the VNAV
Approach and LEGS CMA-9000 Display Panel pages will be lower than the charted procedure
altitudes.
Temperature compensation is applied to altitudes for all approach and approach transition waypoints.
The FMS determines the VPA for the selected approach based on the following priority scheme :
1. Use VPA encoded in the navigation database ; or
2. Compute VPA based on vertical path joining FAF altitude plus 50ft and runway threshold elevation plus 50ft
; or
3. If no FAF altitude is encoded, use 3.00 degrees vertical path projected backward from the runway elevation
plus 50ft.
NOTE: When following the VNAV profile, upon overflying the FAF, the crew may notice a difference between
the indicated altitude and the FAF charted altitude. The indicated altitude will be 50 ft or more above
the FAF charted altitude. The reason for this difference is because the FMS computes the target vertical
profile using the VPA determined by the above priority scheme.
If the computed VPA is below 2.75 degrees, an alert message (“LOW GLIDEPATH ANGLE”) will apprear in the
scratchpad.
If the computed VPA exceeds 3.77* degrees, an alert message ("HIGH GLIDEPATH ANGLE") will appear.
NOTE: Maximum value is configurable up to 10.0 degrees depending on the installation.
CAUTION:
If LOW or HIGH GLIDEPATH ANGLE message are displayed, the crew has to verify the VPA
displayed on the VNAV approach page. If VPA is appropriate, the approach can be conducted. If
VPA is inapropriate (exceed aircraft performance limitation or does not correspond to approach
plate value) stop using the FMS for this advisory VNAV approach and advise maintenance
operation. Guidance will still be provided in case HIGH/LOW glidepath message are displayed.
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