Beechcraft C-12C, Operator And Technical Reference Manual

Page: 708 / 949

TM 1-1510-218-10
For this example, the runway length is 6000 feet
and there is no displaced threshold or other
information limiting the useful landing distance of the
runway.
Reducing takeoff weight and using flaps 40%.
Delaying the departure for more favorable
weather conditions.
Enter the length, 6000 feet, in the appropriate
block on the TOLD card.
(10) V
1
(Takeoff Decision Speed) / V
r
(Rotation
Speed) . In the C-12 aircraft V
1
and V
r
are always the
same speed. Use the tabular data table at the top of
Figure 7A-21, Take-Off Distance, Flaps
UP or Figure
7A-25, Take-Off Distance, Flaps APPROACH .
(14) Landing Weight. For the takeoff TOLD
card, landing and takeoff weights are the same. For
arrival at the destination the TOLD card must be re-
calculated to reflect actual aircraft weight and airport
conditions.
The takeoff configuration for this example is
Flaps UP . The V
1
/V
r
speed is 112 KIAS.
For this example, takeoff and landing weight is
12,600 pounds.
Enter the speed, 112 KIAS, in the appropriate
block on the TOLD card.
Enter the weight, 12,600 pounds, in the
appropriate block on the TOLD card.
(11) V
2
/ V
yse
. Use the tabular data table at the
top of Figure 7A-31, Climb – One Engine Inoperative .
In accordance with the ATM, flaps are retracted just
after liftoff 105 KIAS for both a normal takeoff and in
the event of an engine failure after V
1
. The V
2
/ V
yse
-
KNOTS, Figure 7A-31, is V
yse
and is essentially the
same speed as V
2
for a takeoff with flaps at 0%.
Consequently, V
2
flaps 0% and V
yse
are used as the V
2
speed for entry on the TOLD card. V
2
/ V
yse
for a
12,600 pound aircraft is 122 KIAS.
(15) V
ref
Speed. This speed is 1.3 times V
so
at
the intended landing weight if the landing will be
accomplished using Flaps
DN . If the landing will be
accomplished with the Flaps at APPROACH , or any
setting greater than APPROACH but less than DOWN ,
then V
ref
is 1.3 times V
s
1
(the stall speed for FLAPS
APPROACH ). Use Figure 7A-13, Stall Speeds –
Power Idle to determine applicable stall speeds.
Enter the speed in the appropriate block on the
TOLD card.
For this example, the landing weight (assuming
an emergency return to the departure airport) is
12,600 pounds. A landing with the Flaps
DOWN is
planned. The V
so
for a 12,600 pound aircraft is
75 KIAS. Therefore, V
ref
is 1.3 times 75 = 97.5 and is
rounded up to 98 KIAS.
(11A) If conducting an obstacle clearance
climb, use the “V
x
” speed from the TAKEOFF
DISTANCE – FLAPS APPROACH chart.
(12) Climb Gradient Altitude. This is the
altitude to which the single engine climb gradient must
be continued as specified in the applicable DP. The
information is advisory and intended as a reminder to
the crew of the altitude to which they must climb at V
2
/
V
yse
in order to clear obstacles.
There is another method to determine V
ref
when
the landing will be accomplished with the Flaps
DOWN . Subtract 5 KIAS from the APPROACH
SPEED ~ KNOTS obtained from the tabular data table
at the top of Figure 7A-107, Landing Distance Without
Propeller Reversing, Flaps
DOWN . For a 12,600
pound aircraft the given APPROACH SPEED is 103
KIAS – 5 KIAS = 98 KIAS. For this example, the DP specified climbing to
5000 feet MSL.
Enter the altitude, 5000 feet, in the appropriate
block on the TOLD card.
NOTE
If the aircraft will be landed with FLAPS
less than full DOWN, the LANDING
DISTANCE – FLAPS UP must be used to
obtain the landing distance for the TOLD
card. Refer to Figure 7A-108 or 7A-110.
NOTE
Items 13 through 17 are initially calculated
at takeoff weight as a contingency for a
necessary return to the takeoff airport right
after departure. The items must be re-
calculated for the arrival at the destination.
As another example, if the landing was planned
using the Flaps at APPROACH , or any intermediate
setting short of DOWN , then the V
ref
speed would be
1.3 times V
s
1
(the FLAPS APPROACH stall speed).
FLAPS APPROACH stall speed for a 12,600 pound
(13) Runway Length Available. This is the
runway length available for landing.
7A-6