lWINCOMANCHEC/R
OIL REQIREMENTS
The oil capacity of the Lycoming engines is 8 quarts with a minimum safe quantity
of
2 quarts. it is
recommended that engine oil be drained and renewed every
50
hours or sooner under unfavorable
conditions. Intervals between oil changes can be increased as much as 100% on engines equipped with full
flow cartridge type oil filters provided the element is replaced each 50 hours of operation. The following
grades are required for temperatures:
l
Temperatures above 60’ F
Temperatures between 30” F and 90” F
S.A.E. 50
S.A.E. 40
Temperatures between 0” F and 70” F
Temperatures below 10” F
S&E. 30
SAE. 20
FUEL SYSTEM
The fuel screens in the strainers require cleaning at fifty hour or ninety day intervals whichever first
occurs. The fuel strainers beneath the floor panel are accessible through a plate in the underside center of
the fuselage. The fuel injector screen is located in the housing where the fuel inlet line connects to the
injector. This screen should be cleaned every fifty hours of operation.
FUEL REQUIREMENTS
A minimum octane of 100/l 30 Aviation Grade fuel must be used in the Twin Comanche. Since the
use of lower grades of fuel can cause serious engine damage in a short period of time, the engine warranty is
invalidated by use of lower octanes.
FILLING FURL CELLS
i
Observe all required precautions for handling gasoline. Fill the fuel cells to the bottom of the filer
neck with the fuel specified on the placard located on the underside of the flier cover or in Table II-I. Each
main (inboard) fuel cell holds a maximum of 30 U. S. gallons. The auxiliary (outboard) fuel cells have a
maximum capacity of 15 U.S. gallons each which give a total of 90 U. S. gallons of fuel with 84 U. S.
gallons usable. In addition, as optional equipment are tip tanks with a capacity of 15 U. S. gallons each. In
order to obtain maximum capacity when filling fuel cells, the plane should be approximately level.
DRAINING FURL VALVES AND LINES
The fuel falter bowls and lines are drained by opening the access door within the fuselage just aft of
the fuel selector console, and pulling up on the red knob in the center of each valve. A transparent plastic
tube is attached to each filter bowl and extends through a hole in the bottom of the fuselage. Flow of the
fuel is observed by means of the transparent tube. The fuel valves, bowls and lines should be drained
regularly to check for water or dirt accumulations.
a.
The procedure for draining the lines from main and auxiliary cells is to open the drain valve for a
HANDLING AND SERVICING
ISSUED: June 1,197O
PAGE 7
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