Fuel Bay Purging; Integral Fuel Bay Sealant; Auxiliary Fuel Pump On Turbo Equipped Airplanes - Cessna T182 Series Service Manual

MODEL 182 & T182 SERIES SERVICE MANUAL
1. Hose (Fuel Outlet)
2. Fitting 2
3. Jam Nut
4. O-Ring 3 12
5. Fitting
6. Hose (Fuel Inlet)
7. Fitting
8. Drain Line
9. Fuel Pump
10. Mount Bracket
11. Screw
12. Clamp
6
Figure 12-9. Auxiliary Fuel Pump on Turbo Equipped Airplanes.
If a leak causing a flight hazard should occur at a Since argon or carbon dioxide are heavier than air,
place where there are no facilities available to these gases will remain in the bay during the repair.
make an acceptable repair, it is recommended that
The repair shall be made using non-sparking tools
the leaking bay be drained and some suitable ma-
(air motors, plastic scrapers, etc.)
terial placed over the leak, if it is within an en-
closed area of the wing, to eliminate escaping NOTE
fumes. By switching the fuel selector valve to the
other bay, the aircraft can then be flown to a base
Portable vapor detectors are available to
where the fuel leak can be repaired.
determine presence of explosive mixtures
and are calibrated for leaded fuel. These
12-43. FUEL BAY PURGING.
detectors can be used to determine when
it is safe to make repairs.
12-44. INTEGRAL FUEL BAY SEALANT.
Two kinds
of sealants are used, one to seal the fuel bay and the
Purge fuel bays with an inert gas prior to
repairing fuel leaks, to preclude the possi- other to seal the access doors and fuel quantity trans-
repairing fuel leaks, to preclude the possi-
bility of explosions.
pliable and will not adhere to metal as firmly as the
bay sealant does. This permits the access doors and
The following procedure may be used to purge the
fuel quantity transmitter adapter to be removed with-
bay with argon or carbon dioxide.
out damage to them. Service Kits SK210-56 (6-ounce
a. Ground the aircraft to a suitable ground stake. tube) and SK210-101 (2.5-ounce tube), which re
b. Place fuel selector in the OFF position, and
available from the Cessna Supply Division, con-
leave in this position throughout all remaining steps. tain these sealants with the proper quantity of
accelerator for each sealant. The sealants can be
c. Drain all fuel from bay being repaired.
(Observe identified by color. The bay sealant is white and
the precautions in paragraph 12-3.) its accelerator is a black paste. The access door
d. Remove access door and insert hose into bay.
sealant is grey and its accelerator is a clear
e. Allow inert gas to flow into bay for several min- liquid.
utes (time dependent upon hose size, rate of flow,
etc.) to remove all fuel vapors.
12-24