737 Operations Manual
Performance Inflight -
Text
737-400/CFM56-3_23.5K
Copyright © The Boeing Company. See title page for details.
PI.26.4 D6-27370-400E-TBCE
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 9000 ft.
Detailed analysis for the specific case from the Airplane Flight Manual
may yield a less restrictive penalty.
Takeoff %N1
To find Max Takeoff %N1 based on normal engine bleed for air
conditioning packs on (Auto), enter Takeoff %N1 Table with airport
pressure altitude and airport OAT and read %N1. For packs off operation,
apply the %N1 adjustment shown below the table. No takeoff %N1
adjustment is required for engine and wing anti-ice.
ANTI-SKID INOPERATIVE V1 ADJUSTMENT
FIELD LENGTH (FT) V1 ADJUSTMENT (KIAS)
6000 -28
8000 -22
10000 -18
12000 -14
14000 -13
June 07, 2002
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