Section 3
Emergency Procedures
Columbia 400 (LC41-550FG)
RC050002
Initial Issue of Manual: November 10, 2004
3-22
Latest Revision Level/Date: -/11-10-2004
stoppage. If the engine failure is a result of fuel starvation with a fuel pressure less than 5.5 psi,
then the FUEL annunciator will provide a visual indication.
There is a latching relay that basically controls the logic of the system. For example, it turns the
backup pump on, when the backup boost switch is in the ARMED position and the fuel pressure
drops below 5.5 psi. Moreover, if the backup system is automatically turned on while the vapor
suppression
is on, it will suspend operation of the vapor suppression. Most functions in the
system are integrated with the latching relay, and failure of this relay will result in failure of the
system. However, the FUEL annunciator light is independent of this system and will operate
anytime the fuel pressure is less than 5.5 psi.
In a situation involving a double failure, i.e., a malfunction of the engine driven pump and the
latching relay, the FUEL annunciator will illuminate. Since the primer and backup boost pump
are one and the same, the pilot can bypass the latching relay by holding the primer switch in the
depressed position. In this particular situation, this would restore engine power and permit
continuation of the flight and a landing, which must be done as soon as possible. Of course, the
pilot must continually depress the primer switch, which increases the cockpit workload.
CAUTION
Do not shut down an engine for practice or training purposes. If engine
failure is to be simulated, it shall be done by reducing power. A few minutes
of exposure to temperatures and airspeeds at flight altitudes can have the
same effect on an inoperative engine as hours of cold-soaking in sub-Arctic
conditions.
Gliding Distance
(Zero Wind – Best Distance Glide)
0
2000
4000
6000
8000
10000
12000
14000
0
5
10
15
20
25
Ground Distance (NM)
A
ltitude (FT)
Propeller control pulled to low rpm, flaps up, 108 KIAS, L/Dmax = 13/1
Figure 3 - 4