Mooney M20TN, Service And Maintenance Manual

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MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 7
The following procedures are recommended to purge
system:
A. Connect recharge cart to filler valve. Set cart
pressure regulator to deliver 50 PSI to system.
B. Plug in oxygen mask at each outlet in cabin.
C. Open cabin door and place control knob in “half
open” position.
D. Allow system to purge for one hour. If an offen-
sive odor still lingers, continue purging system for an
additional hour. If such odors still remain, replace sup-
ply cylinder. After system has been adequately purged,
remove masks from outlets, place control knob in
“OFF” position. Service system as described in
35--00--01.
6. Oxygen cylinder removal.
The oxygen cylinder is located in tailcone, aft of bag-
gage compartment bulkhead. Access to cylinder is ob-
tained through access door on left side of aircraft aft of
wing.
-- WARNING --
Keep fire, cigarettes and sparks away from vicin-
ity of the oxygen cylinder. Oil and grease will IG-
NITE upon contact with oxygen under pressure.
A. Place pilot’s control knob in “OFF” position.
B. Gain access to cylinder through access door.
C. Slowly loosen supply line fittings at cylinder
valves, (reference Figure 35--1), to relieve any pres-
sure that may exist in supply lines. After pressure is re-
lieved, remove lines.
D. Disconnect control cable (3) from arm (4) on re-
ducing valve (5).
E. Cap all open lines and regulator openings with
clean metal caps.
F. NOTE orientation of regulator valves and control
arm relative to attachment lines and bulkheads, prior to
removal.
G. Loosen cylinder retaining clamps (11), while
supporting cylinder. Carefully remove cylinder/regula-
tor assembly from secured position.
7. Oxygen cylinder installation.
NOTE:
On AVOX System/Scott Oxygen Bottle Regulator
control lever arm, the clevis pin and clinch nut
MUST be removed and the 3/16 inch hole reamed
to .250/.254 and deburred. Then install Cable
Stop in regulator lever. Attach cable wire to cable
stop. Check for proper ON – OFF position of
cockpit control to make sure full travel is ob-
tained in order for oxygen to be completely ON or
OFF. Complete cable stop attachment. Cut ex-
cess cable wire off and bend wire end over 90
o
.
A. Place new cylinder/regulator assembly into
position in clamps, secure and safety. New cylinder/
regulator assembly should be positioned with regulator
valves and control arm in same position as old, re-
moved cylinder assembly components.
B. Remove caps from lines. Carefully inspect all
connections for damage or any foreign substance be-
fore connection to new cylinder and valves.
C. Connect all lines to proper fittings. Connect con-
trol cable (3) to arm (4) on reducer valve (5).
D. Charge cylinder, if required, to correct pressure,
see recharging table on (Figure 35--2).
E. Place pilot’s control knob to “ON” position and
plug an oxygen mask into pilot’s outlet to check for
proper system operation.
F. Repeat this checkout procedure for all outlets.
G. Test system for leaks per leak test check, para-
graph 35--00--02.
H. Reinstall access door.
AVOX Systems/Scott Aviation recommends an oxygen
system component overhaul at minimum six year inter-
vals for the 895 Series CRA. Refer to AVOX Compo-
nent Maintenance Manual for overhaul procedures.
NOTE:
Oxygen cylinders must be hydrostatic tested in
accordance with DOT Code of Federal Regula-
tions, Title 49, Volume 2, Part 173.34.
(REFER TO SECTION 5--10--01 ALSO)
NOTE:
Light weight and composite oxygen cylinders
must be replaced every 10,000 recharge cycles.
NOTE:
Maximum life for composite oxygen cylinders is
15 years.
NOTE:
Maximum life for light weight steel oxygen cylin-
ders is 24 years.
Filling pressures will vary due to ambient temperature
in the filling area and the rise of temperature resulting
from compression of the oxygen. Because of this,
merely filling to 1850 PSIG will not result in a properly
filled cylinder. Fill to pressures indicated on chart, Fig-
ure 35--2, for ambient temperatures.
35--00--02