Cessna 188 Series Service Manual page 301

MODEL 188 & T188 SERIES SERVICE MANUAL
15-37C. 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.
B. While the transmitter float arm is being actuated, apply airplane battery electrical power as
required to ensure that the fuel quantity indicator follows the movement of the transmitter float
arm. If this does not occur, troubleshoot, repair and/or replace components as required until the
results are achieved as stated.
NOTE: Stewart Warner fuel quantity indicating systems can be adjusted. Refer to this section for
instructions for adjusting Stewart Warner fuel indicating systems.
Rochester fuel quantity indicating system components are not adjustable, only component
replacement or standard electrical wiring system maintenance practices are permitted.
5. With the fuel selector valve in the "OFF" position, add unusable fuel to each fuel tank.
6. Apply electrical power as required to verify the fuel quantity indicator indicates "EMPTY".
A. If "EMPTY" is not indicated, adjust, troubleshoot, repair and/or replace fuel indicating components
as required until the "EMPTY" indication is achieved.
NOTE: Stewart Warner fuel quantity indicating systems can be adjusted. Refer to this section for
instructions for adjusting Stewart Warner fuel indicating systems.
Rochester fuel quantity indicating system components are not adjustable, only component
replacement or standard electrical wiring system maintenance practices are permitted.
Temporary Revision Number 4
7 October 2002 © 2002 Cessna Aircraft Company 15-12C