PIPER COMANCHE SERVICE MANUAL
04/01/09 II - HANDLING AND SERVICING
1C15
2-60. 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.
2-61. 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 or DOT 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 2-62.
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 latest revision of FAA Manual AC 43.13-1 for more service details.
2-62. 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-7703
shall be used.
TABLE II-IV. INSPECTION - OVERHAUL TIME LIMITS
Component Inspection Overhaul
Cylinder Weekly
1
Each 3 Years
Regulator On Condition / Each Use
2
Every 6 Years
Pressure Gauge On Condition / Each Use
2
Replace on Condition
High Pressure Lines On Condition / Each Use
2
Replace on Condition
Low Pressure Lines On Condition / Each Use
2
Replace on Condition
Outlets On Condition / Each Use
2
Replace on Condition
External Recharge Valve On Condition / Each Use
2
Replace on Condition
3
Masks On Condition / Each Use
2
Every 5 Years
NOTES: 1. Visual inspection for dents, bulges, corrosion, or chafing.
2. Visual inspection in the normal course of use.
3. If the screen in front of valve is dirty, replace valve.
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