787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Performance Inflight
Tex t
787-8/
FAA
Category A Brakes
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC PI.18.3
(1) Determine takeoff speeds V1, VR and V2 for actual brake release
weight using Takeoff Speeds tables in this section.
(2) If V1(MCG) limited, set V1=V1(MCG). If not limited by V1(MCG)
considerations, enter the V1 Adjustment table with actual brake release
weight to determine the V1 reduction to apply to V1 speed. If the adjusted
V1 is less than V1(MCG), set V1=V1(MCG).
Slippery Runway
Airplane braking action is reported as good, medium or poor, depending
on existing runway conditions. If braking action is reported as good,
conditions should not be expected to be as good as on clean, dry runways.
The value “good” is comparative and is intended to mean that airplanes
should not experience braking or directional control difficulties when
stopping. Good reported braking action denotes wet runway conditions or
runways covered by compact snow. Similarly, poor braking action denotes
runways covered with wet ice. Performance is based on reversers operating
and a 15 ft screen height at the end of the runway. The tables provided are
used in the same manner as the Slush/Standing Water tables.
Minimum Control Speeds
Regulations prohibit scheduling takeoff with a V1 less than minimum V1
for control on the ground, V1(MCG), and VR less than minimum VR,
(1.05) VMCA. It is therefore necessary to compare the adjusted V1 and
VR to V1(MCG) and Minimum VR respectively. To find V1(MCG) and
Minimum VR, enter the V1(MCG), Minimum VR table with the airport
pressure altitude and actual OAT. If the adjusted V1 is less than
V1(MCG), set V1 equal to V1(MCG). If the adjusted VR is less than Min
VR, set VR equal to Min VR and determine a new V2 by adding the
difference between the normal VR and Min VR to the normal V2. No
takeoff weight adjustment is necessary provided that the field length
available exceeds the minimum field length shown in the Field and Climb
Limit Weight table in Performance Dispatch chapter.
Takeoff TPR
To find Max Takeoff TPR based on anti-ice on or off enter Max Takeoff
TPR Table with airport pressure altitude and airport OAT and read TPR.
Regulations permit the use of up to 25% takeoff thrust reduction for
operation with assumed temperature reduced thrust. Use of reduced thrust
is not allowed on runways contaminated with water, ice, slush or snow.
Use of assumed temperature reduced thrust is not recommended if
potential windshear conditions exist. The assumed temperature reduced
takeoff TPR is read from the Max Takeoff TPR table at the assumed
February 15, 2010
To Next Page
Loading...
