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Operating In Icing Conditions
Enroute Icing Penalty
When dispatched to land at temperatures below 46°F and when enroute icing is
forecast, use the following procedures to determine the Approach Climb Limit
weight adjustment for accumulated airframe ice:
· Enter the chart labeled Approach Climb Limit for the desired landing flap
setting. Read the Approach Climb Limit Weight.
· Reduce the Approach Climb Limit Weight by the following:
>> @ B CD
FLAPS 30 9,600 lbs. 9,200 lbs. 15,300 lbs. 14,000 lbs.
FLAPS 40 10,800 lbs. 10,300 lbs. 15,300 lbs. 14,000 lbs.
Anti-Ice Operation Penalty
For dispatch planning, when icing conditions are forecast at the destination for
the time of landing, subtract the appropriate anti-ice penalty from the Approach
Climb Limit Weight for use of Engine or Engine & Wing Anti-Ice during
approach.
Note: Wing Anti-Ice is operationally utilized as a de-ice system and only
under the most severe icing conditions should this penalty be applied.
>>
ANTI-ICE FLAPS 30 FLAPS 40
ENGINE 1,000 lbs 1,000 lbs
ENGINE & WING 10,700 lbs 11,700 lbs
@
ANTI-ICE FLAPS 30 FLAPS 40
ENGINE 1,000 lbs 1,000 lbs
ENGINE & WING 10,400 lbs 10,600 lbs
B
ANTI-ICE FLAPS 30 FLAPS 40
ENGINE 500 lbs 500 lbs
ENGINE & WING 3,000 lbs 3,000 lbs
Sec. 5 Page 132 737
Rev. 11/15/02 #41 Continental Flight Manual
C
ANTI-ICE FLAPS 30 FLAPS 40
ENGINE 500 lbs 500 lbs
ENGINE & WING 3200 lbs 3200 lbs
D
ANTI-ICE FLAPS 30 FLAPS 40
ENGINE 600 lbs 600 lbs
ENGINE & WING 3100 lbs 3100 lbs
737 Sec. 5 Page 133
Flight Manual Continental Rev. 11/15/02 #41
Sample Problem - Icing Conditions - Landing Flaps 30° >>
Airport ---------- AAA
Elevation ---------- 200 Ft.
Wind ---------- Calm
Temperature ---------- 20°F
Weather ---------- Icing Conditions
Anti-Ice ---------- Engine & Wing ON
· The Approach Climb Limit Weight is 135,500 lbs.
· For landing flap 30, the Engine and Wing Anti-Ice ON penalty is 10,700
lbs. and the penalty for operation in icing conditions is 9,600 lbs.
· 135,500 minus (10,700 + 9,600) = 115,200 lbs. Approach Climb Limit
Weight.
· When comparing the approach climb, runway limited runway length, and
maximum structural landing weight, the maximum structural landing
weight is the least value of the conditions. Therefore, in this example the
maximum structural landing weight of 114,000 lbs. is the maximum
landing weight.
Auto Speedbrakes (Ground Spoilers) Inoperative
A dispatch penalty for auto speedbrakes inoperative is assessed by
ACCULOAD. After dispatch, if the auto speed brakes system fails, and
ACCULOAD is not available, manual calculation of appropriate landing
penalties will be necessary as the landing roll-out may be longer than planned.
Apply the appropriate penalty in accordance with the notes found below the
applicable LANDING RUNWAY WEIGHT LIMIT Chart:
>>@: The penalty is a reduction (in feet) to the effective landing
length.
BCD: The penalty is a weight reduction (in pounds) to the runway
landing limit weight.
Sec. 5 Page 134 737
Rev. 11/15/02 #41 Continental Flight Manual
Quick Turn Around Weight Limit Charts
(Minimum Ground Time After Clearing Runway)
Use one of the following procedures:
· Max QTA Weight Charts – See this section.
Following a landing where the landing weights exceed those in the
Maximum Quick Turn Around Weight Charts, confirm the wheel thermal
plugs have not melted after remaining on the ground a minimum of 53
minutes >>@, 62 minutes B or 67 minutes CD.
· Brake Temperature Measurement – Maintenance function.
Co-ordinate and confirm with maintenance that each brake pressure plate
temperature, without artificial cooling, is determined to be less than 300°F
>>@ or 425°F BCD using approved methods.
If each measured pressure plate temperature is less than these limits,
immediate dispatch is allowed. If measured temperature is greater than
these limits, the appropriate ground “wait” period applies.
Note: Refer to the adjustments and time references at the bottom of the
appropriate Max QTA Charts.
737 Sec. 5 Page 135
Flight Manual Continental Rev. 11/15/02 #41
Maximum Quick Turn Around Weight Limits
>>
MAXIMUM QUICK TURN AROUND WEIGHT LIMITS
FLAPS 30 LBS. X 1000
PRESSURE ALTITUDE - FEET
°F 0 1000 2000 3000 4000 5000 6000 7000 8000
-10
0
10
20
30
40
50
　
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