737 Operations Manual
Performance Inflight -
Text
737-500/CFM56-3_20K
Copyright © The Boeing Company. See title page for details.
PI.36.4 D6-27370-400E-TBCE
1. Determine takeoff speeds V1, VR and V2 for actual brake release
weight using the Takeoff Speeds table in this section.
2. If V1(MCG) limited, set V1 = V1(MCG). If not limited by V1(MCG)
considerations, enter 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. The performance level used to calculate the “good” data is
consistent with wet runway testing done on early Boeing jets. The
performance level used to calculate the “poor” data reflects a runway
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.
Anti-skid Inoperative
When operating with anti-skid inoperative, the field limit weight and V1
must be reduced to account for the effect on accelerate-stop performance.
A simplified method which conservatively accounts for the effects of anti-
skid inoperative is to reduce the normal runway/obstacle limited weight by
7500 kg and the V1 associated with the reduced weight by the amount
shown in the table below.
If the resulting V1 is less than minimum V1, takeoff is permitted with V1
set equal to V1(MCG) provided the dry accelerate stop distance adjusted
for wind and slope exceeds approximately 7900 ft.
Detailed analysis for the specific case from the Airplane Flight Manual
may yield a less restrictive penalty.
ANTI-SKID INOPERATIVE V1 ADJUSTMENT
FIELD LENGTH (FT) V1 ADJUSTMENT (KIAS)
6000 -31
8000 -24
10000 -19
12000 -15
14000 -12
December 06, 2002
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