Mooney M20TN, Service And Maintenance Manual

Page: 360 / 1169

MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 14
PRESSURE
SENSOR
PRY OUT
PLUG
DISPLAY LOGIC CONTROLLER
FIGURE 35--12
5. Using a soft rubber or simulate tube with and Inside
Diameter (ID) of 7/16in, connect one end to the pres-
sure sensor nipple, and the other to the static line on a
Pitot--Static Test system with pump. (See Figure
35--10)
PRESSURE
SENSOR
7/16” INSIDE
DIAMETER
TO TEST
EQUIPMENT
DISPLAY LOGIC CONTROLLER
FIGURE 35--13
-- CAUTION --
CARE MUST BE TAKEN DURING THE INSTALLA-
TION AND REMOVAL OF THE 7/16DIA INSIDE
DIAMETER TUBING TO PREVENT DAMAGE TO
THE SENSOR AND/OR THE CONTROLLER CIR-
CUIT. DO NOT YANK, OR PULL EXCESSIVELY
DURING THE REMOVAL OR DAMAGE WILL OC-
CUR 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--06 - 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--11 thru
35--16.
d. Check wiring diagram against aircraft installation.
See Figure 35--17.
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--Pressure
side will damage the Low--Pressure Transducer
and will Require the Transducer to be Replaced.
35--00--05
AUGUST 2010