Landing - Cessna SKYHAWK 1976 Pilot Operating Handbook

CESSNA
SECTION 5
MODEL 172M PERFORMANCE
The fuel required for cruise is endurance times fuel consumption:
4.1 hours x 7.0 gallons/hour
=
28.7 Gallons
The total estimated fuel required is as follows:
Engine start, taxi, and takeoff
Climb
Cruise
Total fuel required
1.1
2.3
28.7
32.T
Gallons
This will leave a fuel reserve of:
38.0
-32.1
5:9
Gallons
Once the flight is underway, ground speed checks will provide a more
accurate basis for estimating the time enrwte and the corresponding fuel
required to complete the trip with ample reserve.
LANDING
A procedure similar to the takeoff calculations should be used for
estimating the landing distance at the destination airport. Figure 5-10
presents maximum performance technique landing distances for various
airport altitude and temperature combinations. The distances corres­
ponding to 2000 feet altitude and 30°C shwld be used and result in the
following:
Ground roll
590 Feet
Total distance to clear a 50-foot obstacle 1370 Feet
A correction for wind may be made based on Note 2 of the landing chart.
The distance correction for a 6 knot headwind is:
6
Knots
x 10%
=
7% Decrease
9 Knots
This results in the following wind-corrected figures:
Ground roll 549 Feet
Total distance over a 50-foot obstacle 1274 Feet
These distances are well within the landing field length quoted previously
for this sample problem.
5-7