CHAPTER 28
PAGE 5
PAGE DATE: 7. July 2010
MAINTENANCE MANUAL EXTRA 300LT
8 When a fuel tank is opened for repair, air ventilation (refer
to next paragraph) should be provided immediately to re-
duce vapor concentrations.
9 When draining fuel, ensure that suitable containers are
available and that drained fuel is stored safely. Do not allow
fuel to drip on the ground and form pools.
10 If it is necessary to ventilate a tank when the aircraft is in a
hangar, ensure that vapors do not accumulate to explosive
or toxic levels in the hangar.
W A R N I N G When fuel is being drained, there is little control over
the release of fuel vapor. This vapor should be dissi-
pated as quickly as possible. Compressed air or explo-
sion-proof blowers may be used for the purpose.
Air Ventilation
1 Completely drain the fuel system as per chapter 12-10-02.
2 Remove inspection doors (refer to chapter 28-11-04) and
tank caps.
3 Use compressed air or an explosion-proof blower to blow
air into the tank until tank interior is dry and free of vapor.
4 Continue ventilation whenever tank is open and being worked
on.
W A R N I N G If flammable vapors from cleaning solvents are allowed
in the tank increase air circulation to dissipate them.
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