Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 167

CESSNA
MODEL T210M
SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
Fuel quantity is measured by two float-type fuel quantity transmitter s
(one in each tank) and indicated by two electrically-operated fuel quantity
indicators on the lower portion of the pedestal adjacent to the fuel selector
valve handle. The indicators are marked in pounds (top scale) and gallons
(bottom scale) with a red line indicating an empty tank. When an indicator
shows an empty tank, approximately 0.5 gallon remains in the t a nk as
unusable fuel. The indicators cannot be relied upon for accurate readings
during skids, slips, or unusual attitudes. Maximum indicator travel is
reached with 41 to 42 gallons in the tank. Therefore, indications at the right
end of the scale ( 40 gallons to F) should be verified by visual inspection of
the tanks if a short field takeoff or a long range flight is planned.
If
both
indicator pointers should rapidly move to a zero reading, check cylinder
head temperature and oil temperature gages for operation.
If
these gages
are not indicating, an electrical malfunction has occured.
The auxiliary fuel pump switch is located on the left side of the
instrument panel and is a yellow and red split-rocker type switch. The
yellow right half of the switch is labeled START, and its upper ON position
is used for normal starting, minor vapor purging and continued engine
operation in the event of an engine-driven fuel pump failure. With the right
half of the switch in the ON position, the pump operates at one of two flow
rates that are dependent upon the setting of the throttle. With the throttle
open to a cruise setting, the pump operates at a high enough capacity to
supply sufficient fuel flow to maintain flight with an inoperative engine-
driven fuel pump. When the throttle is moved toward the closed position
(as during letdown, landing, and taxiing), the fuel pump flow rate is
automatically reduced, preventing an excessively rich mixture during
these periods of reduced engine speed.
NOTE
If
the engine-driven fuel pump is functioning and the
auxiliary fuel pump switch is placed in the ON position, an
excessively rich fuel/ air ratio is produced unless the
mixture is leaned. Therefore, this switch should be turned
off during takeoff.
NOTE
If
the auxiliary fuel pump switch is accidentally placed in
the ON position with the master switch on and the engine
stopped, the intake manifolds will be flooded.
The red left half of the switch is labeled EMERG, and its upper HI
position is used in the event of an engine cdriven fuel pump failure during
takeoff or high power operation. The HI position may also be used for
extreme vapor purging. Maximum fuel flow is produced when the left half
of the switch is held in the spring-loaded HI position. In this position, an
interlock within the switch automatically trips the right half of the switch
7-31