Oxygen System Component Limits Table; Testing For Leaks; Cleaning Operations - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XIV-I. OXYGEN SYSTEM COMPONENT LIMITS
PARTS
INSPECTION
OVERHAUL
Regulator, when used with
DOT 3AA cylinders
300 Flight Hrs.
5 Yrs.
Regulator, when used with
300 Flight Hrs.
DOT 3HT cylinders
Funtional test every
3 years.
6 Yrs.
Pressure Gauge
300 Flight Hrs.
Replace on Condition
High Pressure Lines
Yearly
Replace on Condition
Low Pressure Lines
Yearly
Replace on Condition
Outlets (Cabin)
Every 2 years.
Replace on Condition
External RechargeValve
Each Use
Replace on Condition
Masks
Each Use
Replace as Necessary
14-7. TESTING FOR LEAKS. Apply detector fluid type CD-I solution or its equivalent. The solution
should be shaken to obtain suds or foam. The suds or foam should be applied sparingly to the joints of a closed
system. Look for traces of bubbles. No visible leakage should be found. Repair or replace any defective parts
and retest system. With the system pressurized to service pressure, further tests can be made. The rate of any
leak should not exceed one percent of the total supply per 24 hour period. All traces of the detector fluid
should be wiped off at the conclusion of the examination.
14-8. MAINTENANCE.
a. Check that all lines have sufficient clearance between all adjacent structures and are secured in
place. Also check the cylinder to be sure it is securely mounted.
b. Check the cylinder for the ICC identification number and for the date of the last FAA inspection
and test.
c. If cylinder is completely empty it must be completely disassembled and inspected in an FAA
approved facility before recharging.
d. Any lines that are defective should be replaced with factory replacements.
e. Clean all lines and fittings as described in paragraph 149.
f. Use Ribbon Dope Thread Sealant (Permacel 412) on male ends of fittings only. Wrap thread in
direction of thread spiral, beginning with the second thread on the fitting. Avoid getting any sealant into the
lines.
g. Refer to FAA Manual AC 43.13-1A for more details.
14-9. CLEANING OPERATIONS. To remove oil and grease from tubing and fittings, one of the following
cleaning methods may be used:
a. First Method:
1. A vapor degreasing with stabilized trichlorethylene conforming to specification MIL-T-7003
shall be used.
2. Blow tubing clean and dry with a stream of clean, dried, filtered air. Care shall be taken to
insure that the interior of the tubing and fittings are thoroughly cleaned.
b. Second Method:
1. Flush with naptha conforming to specification TT-N-95.
2. Blow clean and dry off all solvent with water pumped air.
3. Flush with anti-icing fluid conforming to specification MIL-F-S66 or anhydrous ethyl alcohol.
Revised: 3/31/94
ACCESSORIES AND UTILITIES
4E6