MD-11 Flight Crew Operations Manual
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FMS -
Controls and Displays
FMS.30.64
Line 4L V1, line 5L VR, and line 6L V2 are computed for pilot reference and
display on the PFD. Before any values are computed, the fields are displayed as
dashes allowing pilot entry and clearing. Once these values are computed, they are
displayed in small font with asterisks, prompting the pilot to confirm them by
pushing the associated LSK. CHECK/CONFIRM VSPDS is displayed in the SP
until the pilot either confirms/enters all three Vspds or clears the message. Each
Vspeed is displayed in large font once it is confirmed. Until the throttles are set
for takeoff, the pilot may make an entry overwriting a confirmed or computed
value. If this entry is then cleared, the computed value is redisplayed in small font
with an asterisk and the CHECK/CONFIRM VSPDS message in the SP. Vspeeds
are not computed by the FMS if ALT T/O or any of the GE derate T/O thrust limits
are used.
Confirmed Vspeeds are compared to the computed values and if a +/- 2 knot
tolerance is exceeded, the computed value is displayed in small font with asterisks
and the message CHECK/CONFIRM VSPDS in the SP. If at any time the
computed values are disabled, the CHECK/CONFIRM VSPDS message is
displayed in the SP. This message is also displayed when the FMS goes into LAT
ONLY mode.
The flap and slat retract speeds/final segment climb speed (V3) and operational
climb speed (VCL) displayed in small font to the right of fields 4L, 5L, and 6L are
computed and not pilot-alterable. Whenever V1, VR, and V2 are all confirmed,
the flap retract (VFR), speed is displayed. VSR/V3, the slat retract speed, is equal
to V3 and is computed and displayed based on aircraft gross weight. If FMS is in
LAT ONLY mode, VFR is not calculated by the FMS and is displayed as dashes.
Line 1R provides a prompt to access the THRUST LIMITS page.
Line 2R runway SLOPE/WIND are required for FMS Vspeed calculation. Entries
for either of these two fields must be preceded with a + or a - (even for zeros). A
+ in the slope field represents an uphill slope and a - represents a downhill slope.
Up and downhill slopes may also be entered in the SP preceded by U or D,
respectively. A - in the wind field represents a tailwind and a + represents a
headwind. Head and tailwinds may also be entered in the SP preceded by H or T,
respectively. Omission of the prefixes with the slope and/or wind will be assumed
to be an uphill slope and/or a headwind component, respectively.
October 02, 2006
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