CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
28−00−60
Page 201
Revision 32
FUEL SYSTEM
MAINTENANCE PRACTICES
1. Fuel Cell Cleaning
−
General
(1). Fuel cells are susceptible to fungus
growth after contact with contaminated
fuel. Fungus trapped in the fuel filters
indicates fuel tank contamination.
Remove, inspect, clean or replace filter
elements per applicable Allison Engine
Operation and Maintenance Manual.
Where installed, service anti−ice
(airframe) filter (Ref. Sec. 28−25−00).
(2). Periodic incorporation of an FAA
approved anti−fungal fuel additive will
kill and prevent new fungus growth.
2. Engineered Fabrics Corp. Fuel Cell
Cleaning
Do not steam clean Engineered
Fabrics Corp. fuel cells. Steam
cleaning may cause irreparable damage.
(1). Clean cell exterior and interior surfaces
with warm soapy water and clean lint
free cloth. Rinse away all soap residue
and wipe dry.
3. Fuel Cell Handling, Storage and Shipping
Do not use cell fittings as hand
holds. Do not store fuel cells un-
crated or exposed to direct sunlight, ozone,
dirt, moisture, solvents, chemicals, or ex-
tremes of heat and humidity.
(1). Store and ship cells in a suitable
protective container.
(a). Apply protective tape over all cell
machined fittings.
(b). Use packing material to keep the cell
from shifting in transit.
(c). Suspended self−sealing cells to
maintain cell shape.
4. Fuel Cell Preservation and Storage
(Engineered Fabrics Corp. Cells)
(1). Thoroughly clean cell with warm soapy
water. Wipe completely dry.
(2). If a fuel cell that has previously
contained fuel is to be stored for longer
than three days, coat inside of cell with
a light coating of #10 weight, non−syn-
thetic engine oil.
D
Engineered Fabrics Corp. cells removed
from service must not be left dry for more
than 3 days without the application of oil
as a plasticizing agent. The cell liner will
loose pliability if left dry for extended pe-
riods and subsequent flexing may cause
the material to crack.
D
Do not work on fuel cell in ambient tem-
peratures below 70
°
F (21
°
C).
(a). Fold cell over protective wadding as
loosely as possible and with a mini-
mum number of folds.
(b). Wrap the cell in a protective cover.
(c). Put cell in a suitable storage/ship-
ping container. Use wadding as
required to prevent movement. Do
not stuff cell into an undersized
container.
(d). Store cell at 70
°
F (21
°
C) away from
sunlight and moisture.
5. Fuel System Air Bleed (Model 250
−
C47
Engine Installation)
Fuel/air vapor discharged
during bleeding is a fire haz-
ard. Prevent fuel vapor accumulation,
ignition and fire. Perform work in an
open, well ventilated area away from
all potential ignition sources. Attach
helicopter to an approved electrical
ground. Wear approved eye protection.
(1). Helicopters with C47 engines and
standard fuel supply systems are not
equipped with a start pump.
(2). Helicopters equipped with an airframe
mounted fuel filter are equipped with
an airframe mounted fuel pump inside
the left fuel cell and can be primed
using the same procedure as helicopters
with the 250−C20 Series engines.
CAUTION
CAUTION
CAUTION
WARNING
