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is not an exact science. Because the potential conditions and combinations are
infinitely variable and ever changing, a precise calculation of takeoff / landing
performance is impossible. The ACCULOAD program can compute data for
the following runway conditions: Dry, Wet, and several types and depths of
contamination (depending upon aircraft type). It is the responsibility of the
Captain and Dispatcher to use good judgment in selection of the estimated
runway condition and performance correction factors. Calculations available for
B737, on dry and wet runways, are based upon demonstrated performance in
Boeing tests, not on any specific Coefficient of Braking or Mu.
Takeoff data is based on reported conditions at the time of departure. Load
Planning will provide an ACCULOAD for wet or contaminated takeoff runway
conditions when requested or when a wet or contaminated runway is reported
for a specific flight. Landing data used on the ACCULOAD is for dispatch
purposes and is based upon forecast conditions at the estimated time of arrival.
Refer to the Flight Operations Manual for additional information on this issue.
Dry Runway
ACCULOAD assumes normal braking action on a runway that is smooth
without an enhanced braking friction surface. Stopping data is based upon
“application of the first retarding device” (brake application) at V1 and includes
a pad equivalent to travel for 2 seconds at the V1 speed. Obstacle clearance
height of 35 feet is provided based on the critical engine inoperative. No credit
is available for use of Thrust Reversers. A runway that is only damp (dark
appearance) may have dry braking characteristics.
737 Sec. 5 Page 31
Flight Manual Continental Rev. 11/15/02 #41
Wet Or Slippery Runway
A runway is considered wet when it has a shiny appearance with no measurable
depth of water. Under these conditions, the runway is not considered to be
contaminated, but braking is less than under dry conditions. Runways that are
grooved or have a porous surface are rarely considered wet except during, but
not after a moderate rain shower.
In addition, a runway may be considered slippery but not contaminated as a
result of being covered by packed snow, ice or a combination of water, ice
and/or rubber deposits. Stopping distances under these conditions may exceed
those demonstrated under "wet" conditions.
Wet Runway Adjustments
The wet runway ACCULOAD data provided will be full power, utilizing the
highest compatible numerical flap setting. A wet limit weight is calculated for
the runway length available. V Speeds for the selected flaps are adjusted for the
wet braking conditions and a reduced runway-end crossing height at V2 (15 ft.
instead of 35 ft.). Credit may be taken for use of one Thrust Reverser with
agreement between the Captain and Dispatch. Braking data used by
ACCULOAD for Wet Runways takes no credit for the effect of grooving or
other porous surface characteristics, nor does it incorporate the 2 second pad
found in dry data.
If weather forecasts indicate that wet conditions are a possibility at the time of
departure, the flight will be dispatched for dry runway conditions. The
following line 9 statement will be included in the ACCULOAD weight manifest
(differs for aircraft series):
Wet Rwy possible - Contact Ops If Wet Runway Data Is Required.
Note: When the Captain or Dispatcher concludes that the runway will be wet
or slippery at the time of departure, weights and V Speeds based a wet
runway must be obtained via ACCULOAD / Load Planning and used
for that departure. Manual corrections for wet runways cannot be
made.
Sec. 5 Page 32 737
Rev. 11/15/02 #41 Continental Flight Manual
Contaminated Runway
A runway is considered contaminated if more than 25% of its usable length is
covered by a measurable amount of water, slush and/or snow. These
contaminants slow the acceleration of the aircraft during takeoff and degrade
directional control during landing. ACCULOAD calculations are based on the
same conditions as for wet runways, with the addition of performance penalties
created by the contaminant. There are several levels of takeoff runway
contamination calculated by ACCULOAD for the B737:
· 1mm to 3mm (up to1/8") water/slush depth.
· 1/8" (3mm) to 1/4" (6mm) water/slush depth.
· 1/4" (6mm) to 1/2" (13mm) water/slush depth.
· Four levels (1" 2" 3" 4") of Dry Snow.
Manual corrections for contaminated runways cannot be made. Only
ACCULOAD can calculate Runway Weight Limits and V Speeds for
contaminated runways.
737 Sec. 5 Page 33
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