Cessna 150 Series Service Manual page 182

15-43. TRANSMITTER ADJUSTMENT.
WARNING: USING THE FOLLOWING FUEL TRANSMITTER CALIBRATION PROCEDURES ON
COMPONENTS OTHER THAN THE ORIGINALLY INSTALLED (STEWART WARNER)
COMPONENTS WILL RESULT IN A FAULTY FUEL QUANTITY READING.
15-43A. STEWART WARNER GAGE TRANSMITTER CALIBRATION.
Chances of transmitter calibration changing in normal service is remote; however it is possible that the
float arm or the float arm stops may become bent if the transmitter is removed from the fuel cell/tank.
Transmitter calibration is obtained by adjusting float travel. Float travel is limited by the float arm stops.
WARNING:
USE EXTREME CAUTION WHILE WORKING WITH ELECTRICAL COMPONENTS OF
THE FUEL SYSTEM. THE POSSIBILITY OF ELECTRICAL SPARKS AROUND AN
"EMPTY" FUEL CELL CREATES A HAZARDOUS SITUATION.
Before installing transmitter, attach electrical wires and place the master switch in the "ON" position.
Allow float arm to rest against lower float arm stop and read indicator. The pointer should be on E
(empty) position. Adjust the float arm against the lower stop so pointer indicator is on E. Raise float until
arm is against upper stop and adjust upper stop to permit indicator pointer to be on F (full). Install
transmitter in accordance with paragraph 15-41.
15-43B. ROCHESTER FUEL GAGE TRANSMITTER.
Do not attempt to adjust float arm or stop. No adjustment is allowed.
15-43C. FUEL QUANTITY INDICATING SYSTEM OPERATIONAL TEST.
WARNING:
REMOVE ALL IGNITION SOURCES FROM THE AIRPLANE AND VAPOR HAZARD
AREA. SOME TYPICAL EXAMPLES OF IGNITION SOURCES ARE STATIC
ELECTRICITY, ELECTRICALLY POWERED EQUIPMENT (TOOLS OR ELECTRONIC
TEST EQUIPMENT - BOTH INSTALLED ON THE AIRPLANE AND GROUND
SUPPORT EQUIPMENT), SMOKING AND SPARKS FROM METAL TOOLS.
WARNING:
OBSERVE ALL STANDARD FUEL SYSTEM FIRE AND SAFETY PRACTICES.
1. Disconnect all electrical power from the airplane. Attach maintenance warning tags to the battery
connector and external power receptacle stating:
DO NOT CONNECT ELECTRICAL POWER, MAINTENANCE IN PROGRESS.
2. Electrically ground the airplane.
3. Level the airplane and drain all fuel from wing fuel tanks.
4. Gain access to each fuel transmitter float arm and actuate the arm through the transmitter's full
range of travel.
A. Ensure the transmitter float arm moves freely and consistently through this range of travel.
Replace any transmitter that does not move freely or consistently.
WARNING: USE EXTREME CAUTION WHILE WORKING WITH ELECTRICAL
COMPONENTS OF THE FUEL SYSTEM. THE POSSIBILITY OF ELECTRICAL
SPARKS AROUND AN "EMPTY" FUEL CELL CREATES A HAZARDOUS
SITUATION.
Temporary Revision Number 3
7 October 2002 © 2002 Cessna Aircraft Company
15-16A