Section 5
Performance
Columbia 400 (LC41-550FG)
RC050002
Initial Issue of Manual: November 10, 2004
5-30
Latest Revision Level/Date: -/11-10-2004
HOLDING CONSIDERATIONS
When holding is required, it is recommended that takeoff flaps be used with an indicated
airspeed of 120± knots. Depending on temperature, gross weight, and RPM, the manifold
pressure will range from about 13 to 17 inches. The fuel consumption has wide variability as
well and can range from about 8 to 10 GPH (30.3 to 37.9 LPH). The graph below, Figure 5 - 30,
provides information to calculate either fuel used for a given holding time or the amount of
holding time available for a set quantity of fuel.
The graph is based on a fuel consumption of 9 GPH (34.1 LPH) and is included here to provide a
general familiarization overview. Under actual conditions, most pilots can perform the
calculation for
fuel used
or the
available holding time
without reference to the graph. Moreover,
the graph is only an approximation of the average anticipated fuel consumption. There will be
wide variability under actual conditions.
In the example below, a 35-minute holding time will use about 5.2 gallons (19.7 L) of fuel.
Conversely, if only 8 gallons (30.3 L) of fuel are available for holding purposes, the maximum
holding time is 53 minutes before other action must be taken. Note that this is about the amount
of fuel remaining in a tank when the low-level fuel warning light illuminates.
Figure 5 - 30
HOLDING TIME
(9.0 GPH)
0.0
2.0
4.0
6.0
8.0
10.0
12.0
0
10
20
30
40
50
60
70
TIME - MINUTES
FUEL USED -
GALLONS