TRUE
AIRSPEED
INDICATOR
A
true
airspeed indicator is available to replace the standard air-
speed
indicator in your airplane. The
true
airspeed indicator has a
cali-
*^ brated rotatable
ring
which works in conjunction
with
the airspeed
indi-
^ cator
dial
in a manner
similar
to the operation of a
flight
computer.
TO OBTAIN TRUE AIRSPEED, rotate
ring
until
pressure
altitude
^ is aligned
with
outside air temperature in
degrees
Fahrenheit. Then
_ read
true
airspeed on rotatable
ring
opposite airspeed needle.
NOTE
Pressure
altitude
should not be confused
with
indicated
^
altitude.
To obtain pressure
altitude,
set barometric
^
scale
on altimeter to "29. 92" and read pressure
altitude
on altimeter. Be sure to
return
altimeter barometric
^
scale
to
original
barometric setting after pressure
alti-
tude has
been
obtained.
FUEL
TANK
QUICK-DRAIN
VALVE
KIT
Two fuel tank quick-drain valves and a fuel sampler cup are available
as a kit to facilitate daily
draining
and inspection of fuel in the main tanks
for the
presence
of water and sediment. The valves replace existing fuel
tank
drain
plugs located at the lower inboard area of the wing. The fuel
sampler cup, which may be stowed in the map compartment, is used to
drain
the valves. The sampler cup has a probe in the center of the cup.
When the probe is inserted
into
the hole in the bottom of the
drain
valve
and
pushed upward, fuel flows
into
the cup to facilitate visual inspection
of the
fuel.
As the cup is removed, the
irain
valve seats, stopping the
flow
of
fuel.
7-7
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