Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 298

SECTION 8 CESSNA
HANDLING, SERVICE AND MAINTENANCE MODEL 172S NAV III
FUEL
(Continued)
FUEL ADDITIVES (Continued)
CAUTION
MIXING OF DIEGME WITH FUEL IS EXTREMELY
IMPORTANT. A CONCENTRATION IN EXCESS OF
THAT RECOMMENDED (0.15% BY VOLUME
MAXIMUM) MAY RESULT IN DETRIMENTAL
EFFECTS TO THE FUEL TANK SEALANT, AND
DAMAGE TO O-RINGS AND SEALS USED IN THE
FUEL SYSTEM AND ENGINE COMPONENTS. A
CONCENTRATION OF LESS THAN THAT
RECOMMENDED (0.100/0 BY TOTAL VOLUME
MINIMUM) WILL RESULT IN INEFFECTIVE
TREATMENT. USE ONLY BLENDING EQUIPMENT
THAT IS RECOMMENDED BY THE
MANUFACTURER TO OBTAIN PROPER
PROPORTIONING.
Prolonged storage of the airplane will result in a water buildup in the
fuel which precipitates the additive. An indication of this is when an
excessive amount of water accumulates in the fuel tank sumps. The
concentration can be checked using a differential refractometer. It is
imperative that the technical manual for the differential refractometer
be followed explicitly when checking the additive concentration. )
(Continued Next Page)
8-20 U.S.
172SPHAUS-00