MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Date
MAR 2017
Rev Date
Page
12
-CAUTION-
CARE MUST BE TAKEN DURING THE
INSTALLATION AND REMOVAL OF THE 7/16
DIA. INSIDE DIAMETER TUBING TO PRE-
VENT DAMAGE TO THE SENSOR A ND/OR
THE CONTROLLER CIRCUIT. DO NOT YANK,
OR PULL EXCESSIVELY DURING THE RE-
MOVAL OR DAMAGE WILL OCCUR AND THE
UNIT MUST BE THEN REPLACED.
6. With the aircraft in a safe condition to power up the
Main Bus 2, turn ON the main bus 2 with the oxygen
system off.
7. Cycle the system ON and OFF to ensure the sys-
tem is functioning, use a breathing device to ensure
flow is present. With the system OFF, let the oxygen
“bleed down” prior to removing the breathing device.
8. Using the static portion of the Pitot- Static tester,
increase the static altitude slowly to 11,000ft PA. Con-
tinue increasing the altitude and note when the display
indicates “O2 REQ’D” as signified on the display by the
flashing amber LED. Note the altitude which this oc-
curred.
9. Verify the altitude where the indication first oc-
curred:
a. If indication is between 11,500ft PA and 12,500ft
PA, then proceed to the next step.
b. If the indication is outside of this range, re- verify
the indication. If the DLA fails a second time, remove
the DLA and replace, or contact PFI for re- adjustment.
10. Turn Aircraft power off.
11. Remove the pressure tubing taking extra care not
to damage the DLA pressure transducer .
12. Re- install the dust cover/plug.
13. Note passing test as required.
35-00-04 - PRECISE FLIGHT OXYGEN TROUBLE-
SHOOTING
Oxygen System Fails to Operate
a. Check circuit breaker.
b. Check connector plugs for security and contact in-
sertion.
c. Check the system function per Figures 35- 9 thru
35- 17.
d. Check wiring diagram against aircraft installation.
See Figure 35- 18.
Oxygen System Trouble Shooting Flow Chart
This section is for reference when troubleshooting the
PFI Fixed Oxygen System.
-CAUTION-
Pressures above 105psig on the Low- Pres-
sure side will damage the Low- Pressure
Transducer and will Require the Transducer
to be Replaced.
35-00-04
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