Application Of Tire Rubber Protective Agent; Brake System; Filling Brake Cylinder Reservoir; Hydraulic System - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
2-38a. APPLICATION OFTIRE RUBBER PROTECTIVE AGENT. To prevent tiresidewall crackingdue
to rubber deterioration as the result of ozone attack and weathering it is permissible to apply Age-Master #1
Rubber Protective Agent to the tires as follows:
a.
Clean all of tire surfaces of any oil or grease.
b.
First apply a single heavy coat using a brush at a rate of 0.4 to 0.5 fluid ounces per sq. foot. Cover
surface completely and evenly. Repeat application. Allow to dry for 5 to 10 minutes.
c. Second coat apply per step b. Allow to dry for 20 to 30 minutes before handling.
d. Remote any agent on wheel assembly with cleaning solvent.
e. It is permissible to re-apply as conditions require.
2-39. BRAKE SYSTEM.
2-40. SERVICING BRAKE SYSTEM. The brake system incorporates a hydraulic fluid reservoir through
which the brake system is periodically serviced. Fluid is drawn from the reservoir by the brake master cylinders
to maintain the volume of fluid required for maximum braking efficiency. Spongy brake pedal action is often
an indication that the brake fluid reservoir is running low on fluid or air is in the system. Instructions for filling
the reservoir are given in paragraph 2-41. When its found necessary to accomplish repairs to any of the brake
system components or bleed the system. refer to the instructions given in Section VII.
2-41. FILLING BRAKE CYLINDER RESERVOIR. The brake cylinder reservoir should be filled to the
level marked on the dip stick with the fluid specified in Table II-I. The reservoir, located in the upper nose
section above the power pack shown in Figure 2-9, should be checked at every 50 hour inspection and
replenished as necessary. No adjustment of the brakes is necessary, though they should be checked
periodically per instructions given in Section VII. The reservoir scupper should be sealed per the following
procedure:
1. Gain access to the brake reservoir scupper, open the nose baggage door, remove the tow bar and
screened radio access panel.
2.
Clean surface around scupper and adjacent aircraft skin with a suitable solvent to remove any
foreign matter.
3.
Apply a bead of sealant (3M EC 750 or equivalent) around the scupper. Particular attention should
be paid to sealing the forward edge of the scupper at the hinge attaching point.
4. Install the removed items and make the appropriate logbook entry.
2-42. DRAINING BRAKE SYSTEM. To drain the brake system, connect a hose to the bleeder fitting on the
bottom of the cylinder and place the other end of the line in a suitable container. Open the bleeder and slowly
pump the desired brake pedal until fluid ceases to flow. To clean the brake system, flush with denatured
alcohol.
2-43. HYDRAULIC SYSTEM.
2-44. SERVICING HYDRAULIC SYSTEM. The fluid level in the hydraulic reservoir should be checked
every 50 hours. Access to the reservoir is through the access panel on the right side of the nose section. If
the fluid level is low, it should be filled with filtered hydraulic fluid MIL-H-5606.
Revised: 10/5/83
HANDLING AND SERVICING
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