CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
34
Code
01
REVISION 38
AOM-145/1114
RUNWAY FIELD CLEARANCE FLOOR
Runway Field Clearance Floor (RFCF) is a second clearance floor in
addition to TCF in EGPWS version 216. While TCF uses radio altitude,
RFCF determines the airplane height above the runway using
geometric altitude by subtracting the elevation of the selected
destination runway from the current altitude (MSL). This feature
provides improved alerting for cases where the runway is at a high
elevation compared to the terrain below the approach path.
1.5 nm
FIELD ELEVATION
(NO LOWER LIMIT)
RUNWAY
END
MINIMUM RUNWAY
FIELD CLEARANCE, ft
RFCF
ALERT AREA
EM145AOM042104A.DGN
5.0 nm
(OUTER LIMIT)
RFCF ALERT ENVELOPE
RFCF alerts display “GRND PROX” on the PFD and the aural
message "TOO LOW TERRAIN" sounds. This message sounds once
when initial envelope penetration occurs and will repeat at every
additional 20% decrease in radio altitude.
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