SECTION 4
CESSNA
NORMAL PROCEDURES
MODEL 172S NAV III
GFC 700 AFCS
U.S.
CRUISE
(Continued)
LEANING USING EXHAUST GAS TEMPERATURE (EGT)
The cruise performance data in this POH is based on the
recommended lean mixture setting determined from the maximum or
peak EGT at power settings of 75% MCP and lower. The 172S Nav III
provides EGT indications for all (4) engine cylinders. The ability to
monitor all cylinders is an aid in early identification and correction of
fuel injection problems.
NOTE
All engine cylinders do not receive identical fuel/air mixtures
(due to unequal intake pipe lengths, uneven intake air
temperatures, fuel injection nozzle tolerances etc.).
However, all cylinder EGTs should be within approximately
100°F of each other during normal operations. An EGT
difference greater than 100°F between cylinders indicates
that fuel injection system maintenance is necessary.
EGT is displayed on the EIS ENGINE and LEAN pages. The ENGINE
page has a horizontal scale with a temperature indicator (inverted
triangle) with a number representing the cylinder with the highest EGT.
The EIS LEAN page provides vertical bar graph displays showing EGT
for all cylinders. The cylinder with the highest EGT is shown in cyan
(light blue). The numerical value for the highest EGT is located below
the bar. The EGT and Cylinder Head Temperature (CHT) value for any
cylinder may be shown by using the CYL SLCT softkey to select the
desired cylinder. After a short period without CYL SLCT softkey activity,
automatic indication of the highest EGT and CHT will start again.
(Continued Next Page)
172SPHBUS-01
4-36
Содержание Cessna C172S PIM
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