Cessna 208B - Fuel Selectors off Warning System

CESSNA SECTION 7
MODEL 208B (675 SHP) AIRPLANE AND SYSTEMS DESCRIPTION
FUEL SYSTEM (Continued)
FUEL SELECTORS OFF WARNING SYSTEM
A fuel selectors off warning system is incorporated to alert the pilot if
one or both of the fuel tank selectors are left in the OFF position
inadvertently. The system includes redundant warning horns, a red
annunciator light labeled FUEL SELECT OFF, actuation switches, and
miscellaneous electrical hardware. The dual aural warning system is
powered through the START CONT circuit breaker with a
non-pullable
FUEL SEL WARN circuit breaker installed in series to protect the
integrity of the start system. The annunciator is powered from the ANN
PANEL circuit breaker.
The warning system functions as follows:
(1) If both the left and right
fuel tank shutoff valves are closed (fuel tank selectors in the OFF
position), the red FUEL SELECT OFF annunciator illuminates and one
of the fuel selector off warning horns is activated; (2) During an engine
start operation (STARTER switch in START or MOTOR position) with
either the left or right fuel tank shutoff valves closed, the red FUEL
SELECT OFF annunciator illuminates and both of the fuel select off
warning horns are activated; (3) With one fuel tank selector OFF and
fuel remaining in the tank being used less than approximately 25
gallons, the FUEL SELECT OFF annunciator illuminates and one of the
fuel selector off warning horns is activated.
If the FUEL SEL WARN circuit breaker has popped or the START
CONT circuit breaker has been pulled (possibly for ground
maintenance), the FUEL SELECT OFF annunciator will be illuminated
even with both fuel tank selectors ON. This is a warning to the pilot that
the fuel selector warning system has been deactivated.
(Continued Next Page)
I$
U.S. 7-75