If the oxygen system pressure is
below 200 PSI, do not attempt to
service system. Make an entry on
DA Form 2408-13.
4. Insure that supply cylinder shutoff valves
on the aircraft are open.
5. Fill system slowly to prevent overheating by
adjusting recharging rate with pressure
regulating valve on oxygen servicing unit.
6. Close pressure regulating valve on oxygen
servicing unit when pressure gage on
Servicing Pressure Chart (fig. 2-30).
Fill oxygen system to 1800 PSI at
70°F. For every degree above 70°,
increase pressure 3.5 PSI to a
maximum of 2000 PSI; and for
decrease pressure 3.5 PSI.
7. Disconnect oxygen hose from oxygen
servicing unit and filler valve.
8. Install protective cap on oxygen filler valve.
9. Install oxygen access door.
2-99. GROUND HANDLING.
Ground handling covers all the essential information
concerning movement and handling (fig. 2-31) of the
aircraft while on the ground. The following paragraphs
necessary to accomplish ground handling functions.
a. General Ground Handling Procedure. Accidents
resulting in injury to personnel and damage to
equipment can be avoided or minimized by close
observance of existing safety standard and recognized
insufficient knowledge of the aircraft or equipment being
handled can be fatal. The applicable technical manuals
familiarization with the aircraft, its components, and the
ground handling procedures applicable to it, before
attempting to accomplish ground handling.
b. Ground Handling Safety Practice. Aircraft
equipped with turboprop engines require additional
maintenance safety practices. The following list of
safety practices should be observed at all times to
prevent possible injury to personnel and/or damaged or
(1) Keep intake air ducts free of loose articles
such as rags, tools, etc.
(2) Stay clear of exhaust outlet areas.
(3) During ground runup, make sure the brakes
are firmly set.
(4) Keep area fore and aft of propellers clear of
(5) Do not operate engines with control
surfaces in the locked position.
(6) Do not attempt towing or taxiing of the
aircraft with control surfaces in the locked position.
(7) When high winds are present, do not unlock
the control surfaces until prepared to operate them.
(8) Do not operate engines while towing
equipment is attached to the aircraft, or while the aircraft
is tied down.
(9) Check the nose wheel position. Unless it is
in the centered position, avoid operating the engines at
high power settings.
(10) Hold control surfaces in the neutral position
when the engines are being operated at high power
(11) When moving the aircraft, do not push on
propeller deicing boots. Damage to the heating
elements may result.
c. Moving Aircraft on Ground. Aircraft on the
ground shall be moved in accordance with the following:
(1) Taxiing. Taxiing shall be in accordance with