Ensure that supply cylinder shutoff valves on
aircraft are open.
Slowly adjust valve position so that pressure
increases at a rate not to exceed 200 PSIG per minute.
Close pressure regulating valve on oxygen
servicing unit when pressure gage on oxygen system
indicates pressure obtained using the Oxygen System
Servicing Pressure Chart (fig. 2-40).
To compensate for loss of aircraft cylinder
pressure as the oxygen cools to ambient
temperature after recharging, the cylinder
should be charged initially to approximately
10% over prescribed pressure. Experience
will determine what initial pressure should be
used to compensate for the subsequent
pressure loss upon cooling. A complete
recharge will create substantial heating.
The final stabilized cylinder pressure should be
adjusted for ambient temperature per figure 2-40.
Disconnect oxygen hose from oxygen
servicing unit and filler valve.
Install protective cap on oxygen filler valve
Install oxygen access door.
2-103. GROUND HANDLING.
Ground handling covers all the essential information
concerning movement and handling of the aircraft while
on the ground. The following paragraphs give, in detail,
the instructions and precautions necessary to accomplish
ground handling functions. Parking, covers, ground
handling, and towing equipment are shown in figure 2-41.
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 standards and recognized ground handling
procedures. Carelessness or insufficient knowledge of
the aircraft or equipment being handled can be fatal. The
applicable technical manuals and pertinent directives
should be studied for familiarization with the aircraft, its
applicable to it, before attempting to accomplish ground
Ground Handling Safety Practices. 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 destroyed
(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, ensure the brakes are
(4) Keep area fore and aft of propellers clear of
(5) Do not operate engines with flight control
surfaces in the locked position.
(6) Do not attempt towing or taxiing of the aircraft
with flight control surfaces in the locked position.
(7) When high winds are present, do not unlock
the control surfaces until prepared to properly operate
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
Hold control surfaces in the neutral
position when the engines are being operated at high
When moving the aircraft, do not push on
propeller deicing boots. Damage to the heating elements
Moving Aircraft on Ground. Aircraft on the ground
shall be moved in accordance with the following:
(1) Taxiing. Taxiing shall be in accordance with