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with the tire. In fact, as long as a tubeless tire is inflated, there will be some diffusion from the vents.
When the loss rate exceeds 5% in 24 hours, recheck for possible injuries. Vents should remain open,
so check periodically to make sure they have not been covered over or closed by tire paint or spilled
solvent. And since vents may be covered during retreading, check for evidence that your retreads
have been revented.
Several basic characteristics of tubeless aircraft tires may be mistaken for problems:
1.  
Tire growth in the first 12 to 24 hours after inflation will result in a seemingly severe pressure drop. Simply inflate, wait for another 24 hours, then check pressure. It will probably be within specs.

2.  
Make sure that initial inflation is to recommended operating pressure to ensure full tire growth.

3.  
It is normal for tubeless tires to show a small amount of pressure leakage throughout the life of the tires.

Maintain tires at pressure specified in Chart 601, 6-00-00. When checking tire pressure, examine tires
for wear, cuts, bruises, and slippage. Apply Age-Master #1 to tires to protect against ozone attack and
weathering as follows:
1.  
Clean oil and grease from all tire surfaces.

2.  
Apply single heavy coat using brush at 0.4 -0.5 fluid ounces per square foot. Cover surface completely and evenly; allow to dry for 5 -10 minutes.

3.  
Apply second coat per step 2; allow to dry for 20 -30 minutes before handling.

4.  
Removeagent on wheel assembly with cleaning solvent.

5.  
Apply as conditions dictate.

Q. Hydraulic Power Pack
Check hydraulic power pack reservoir fluid level every 50 hours and fill as required. Special filling and draining service hookup is installed inside right fuselage accesspanel of nose section. A pressure pot or hydraulic test unit can be connected by removing panel, opening accessin hydraulic component covers and protective cap on suction; fill and drain fitting. Connect fluid supply line from supply source to fitting. Raise lever to open valve and fill reservoir. To gravity fill reservoir, support hydraulic fluid supplycontainer higher than fluid level in power pack reservoir. Reservoir is full when fluid reachesfull line on transparentreservoirs. Be sure to close suction; fill and drain valve by placing lever in down position before disconnecting supply line from fitting. Reinstall protectivecap on fitting, close access in hydraulic componentscover, and install access panel.
EFFECTIVITY:
040-999

Jan 10/90 12-10-00
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

R. Propellers
Check blades periodically for damage. Minor nicks in blade leading edges must be filed out and all edges rounded. Daily inspection must include examination of blades and spinner for visible damage and grease leakage. For further information on servicing propeller, refer to Chapter 61 / AC 43.13-1A, Section III on propeller repairing.
S. Engine Lubrication
CAUTION: DO NOT MIX DIFFERENT BRANDS OR SPECIFICATIONS OF OIL. CHEMICAL STRUCTURES CAN DIFFER, MAKING OILS INCOMPATIBLE.
Check engine oil level within ten minutes after engine shutdown. If engine is stationary for 12 hours or more; start it, run at idle for minimum 2 minutes, shutdown, and check oil not more than 10 minutes later. For engines operated in corporate or utility aircraft with typical usage of 50 hours per month or less, change oil every 400 hours of 9 months, whichever occurs first. For engines operated in high utilization commuter airlines, basic oil change periods are 800 hours for 7 1/2 centistoke oil, or 1200 hours for a 5 centistoke oil, or 9 months. Extensions beyond basic oil change period are considered provided oil is monitored by spectrometric oil analysis and a written request is submitted to Pratt & Whitney Canada Limited Service Department. When operation results in frequent cold soaking at ambient temperatures of 0°F (-18°C) or lower, use 5 centistoke oil. For further information, consult latest Pratt & Whitney Service Bulletin 13001.
When changing brand or type of engine oil, flush lubrication system. Refer to draining engine oil section for proper procedure.
T. Engine Oil Level Check
CAUTION: IF OIL LEVEL IN TANK IS BELOW BOTTOM OF DIPSTICK, DETERMINE CAUSE TO TROUBLESHOOT. IF NEITHER FLUCTUATING OR LOW OIL PRESSURE READINGS ARE NOTICED, CHECK FOR EXTERNAL LEAKS AND OIL FILTER CONTAMINATION.CLEAN OIL FILTER AND FILL OIL TANK TO RECOMMENDED LEVEL. RECORD OIL QUANTITY ADDED, COMPLETE 15 MINUTE ENGINE RUN, AND RECHECK OIL QUANTITY AND CONDITION OF OIL FILTER. IF BOTH ARE SATISFACTORY,NO FURTHER ACTION IS NECESSARY. OTHERWISE, REFER TO ENGINE MAINTENANCE MANUAL.
Within 10 minutes following engine shutdown, unlock filler cap at 11 o'clock position on accessory gearbox housing. Check contents of tank against marks on dipstick and fill to required level.
　
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