To compensate for loss of aircraft cylin-
der pressure as the oxygen cools to ambi-
ent temperature after recharging, the cyl-
inder should be charged initially to
approximately 10% over prescribed pres-
sure. Experience will determine what ini-
tial pressure should be used to compen-
sate for the subsequent pressure loss upon
cooling. A small top-off will create little
heat. A complete recharge will create sub-
The final stabilized cylinder pressure should be
adjusted for ambient temperature per figure 2-31.
7. Disconnect oxygen hose from oxygen
servicing unit and tiller valve.
8. Install protective cap on oxygen filler
9. Install oxygen access door.
2-103. GROUND HANDLING.
Ground handling covers all the essential infor-
mation concerning movement and handling of the
aircraft while on the ground. The following para-
graphs give, in detail, the instructions and precau-
tions necessary to accomplish ground handling func-
tions. Parking, covers, ground handling and towing
equipment are shown in figure 2-32.
General Ground Handling Procedure. Acci-
dents resulting in injury to personnel and damage to
equipment can be avoided or minimized by close
observance of existing safety standard and recog-
nized 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 components,
and the ground handling procedures applicable to it,
before attempting to accomplish ground handling.
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 destroyed aircraft:
(1.) Keep intake air ducts free of loose
articles such as rags, tools, etc.
Stay clear of exhaust outlet areas.
During ground runup, make sure the
brakes are firmly set.
Keep area fore and aft of propellers
clear of maintenance equipment.
(5.) Do not operate engines with control
surfaces in the locked position.
Do not attempt towing or taxiing of
the aircraft with control surfaces in the locked posi-
When high winds are present, do not
unlock the control surfaces until prepared to prop-
erly operate them.
(8.) Do not operate engines while towing
equipment is attached to the aircraft, or while the
aircraft is tied down.
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
(11.) When moving the aircraft, do not
push on propeller deicing boots. Damage to the
heating elements may result.
Moving Aircraft on Ground. Aircraft on the
ground shall be moved in accordance with the fol-
(1.) Taxiing. Taxiing shall be in accor-
dance with chapter 8.
When the aircraft is being towed, a quali-
fied person must be in the pilots seat to
maintain control by use of the brakes.
When towing, do not exceed nose gear
turn limits. Avoid short radius turns, and
always keep the inside or pivot wheel
turning during the operation. Do not tow
aircraft with rudder locks installed, as
severe damage to the nose steering linkage
can result. When moving the aircraft
backwards, do not apply the brakes
abruptly. Tow the aircraft slowly, avoid-
ing sudden stops, especially over snowy,
icy, rough, soggy, or muddy terrain. In
arctic climates, the aircraft must be towed
by the main gears, as an immense break-
away load, resulting from ice, frozen tires,
and stiffened grease in the wheel bearings
may damage the nose gear.