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CESSNA AIRCRAFT COMPANY
SINGLE ENGINE
STRUCTURAL REPAIR MANUAL
WING FUEL BAY REPAIRS
1.
Preparing Damaged Area In Wing Fuel Bay for Repair
A.
Before performing any maintenance in fuel bay area, it will be necessary to defuel and purge the fuel
bay. To defuel and purge the fuel bay, proceed as follows:
WARNING: During all fuel system servicing procedures,
fi
re
fi
ghting
equipment must be available.
WARNING: Always ground airplane prior to performing any maintenance of the
fuel system.
WARNING: Avoid drainage from residual fuel held in disconnected fuel lines;
this accumulation constitutes a
fi
re hazard.
WARNING: Use NS-40 (RAS-4) (Snap-On Tools Corp., Kenosha, Wisconsin),
MIL-T-83483 (thread compound, anti- seize, graphite petrolatum),
or engine oil as a thread lubricant or to seal leaking connections.
Apply sparingly to all but
fi
rst two threads of male
fi
ttings, being
careful not to allow entry of compound into fuel system.
NOTE:
Covers or caps should be installed on lines and
fi
ttings to prevent entry of foreign material,
and to prevent damage to threads.
(1)
Ground airplane to a suitable ground stake.
(2)
Ensure airplane battery switch is in OFF position.
(3)
Turn fuel selector valves to OFF position
(4)
Remove fuel
fi
ller cap on bay that is to be defueled; insert defueling nozzle.
(5)
Remove as much fuel as possible through
fi
ller opening.
(6)
Remove drain valves from bottom side of fuel bay and drain remaining fuel into a clean, open
container. Use defueling nozzle to remove fuel from container.
(7)
If necessary, repeat procedures for opposite wing.
WARNING: Purge fuel bays with an inert gas (argon or carbon dioxide)
prior to repairing fuel leaks to preclude possibility of
explosions.
(8)
Insert inert gas supply hose into fuel
fi
ller opening.
(9)
Allow gas to
fl
ow into bay for several minutes to remove all fuel vapors. Since argon or carbon
dioxide are heavier than air, these gasses will remain in bay during repair. Non-sparking tools
shall be used to make repairs (air motors, plastic scrapers, etc.).
NOTE:
Portable vapor detectors are available to determine presence of explosive mixtures
and are calibrated for leaded fuel. The detectors can be used to determine when it is
safe to make repairs.
NOTE:
During structural repair, parts must be predrilled, countersunk or dimpled, and
cleaned before being sealed and positioned for
fi
nal installation.
(10) Remove all existing sealant from area to be sealed, leaving a taper to the remaining sealant.
The taper will allow a scarf bond and a continuous seal when the new sealant is applied.
NOTE:
The best method of removing sealant is with a chisel-like tool made of hard
fi
ber or
plexiglass. Remaining sealant can be removed with aluminum wool. Steel wool or
sandpaper must not be used.
57-11-00
Page 801
© Cessna Aircraft Company
Jun 1/2005
Содержание 172 Skyhawk SERIES
Страница 11: ...CHAPTER STANDARD PRACTICES STRUCTURES ...
Страница 68: ...CHAPTER 52 DOORS ...
Страница 74: ...CHAPTER 53 FUSELAGE ...
Страница 97: ...CHAPTER 55 STABILIZERS ...
Страница 106: ...CHAPTER 56 WINDOWS ...
Страница 115: ...CHAPTER 57 WINGS ...
Страница 158: ...CHAPTER 71 POWER PLANT ...