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fluid required for maximum brakingefficiency.Spongybrakepedalactions is oftenan indication that
the brakefluid reservoir is running lowon fluid or air. Whenrepairsto brake system componentsor
bleedingthe systemarerequired,referto instructions in 32-40-00.
K.  Filling Brake System Reservoir
Thebrakesystemreservoirmust be filled with hydraulicfluidto the level markedon the dipstick (MIL-H-5606). The reservoirin the upper nosesectionabovethe power pack mustbe checked at every 50 hourinspectionand replenished as necessary.Accessto the reservoir is through the dooron the upperrightportionof the nose section. If fluid levelis low, it must be filled with filteredhydraulicfluid (MIL-H-5606).No adjustment to the brakes is necessary, but they must be checked periodically per instructionsgiven in 32-40-00.
L.  DrainingBrakeSystem
To drain brake system,connecthoseto bleeder fittingon brake housing. Placeother hoseend in suitablecontainer. Openbleedervalve and slowlypump brakepedaluntil fluid stopsflowing. Toclean system,flushwith denatured alcohol.
NOTE: If brake system isdrained,partsreplaced,or line connectionsbroken,pressurefill and bleed systemper procedure in 32-40-00. Procedureassuresair is not trapped in system.
M. LandingGear OleoStruts(Referto Figure 12-2)
WARNING: DO NOT RELEASEAIR BY REMOVING STRUTVALVECORE OR FILLERPLUG. DEPRESSVALVECOREPINOR OPEN AIR VALVE SLOWLYTO RELEASESTRUT PRESSURE(ASAPPLICABLE).
Air-oilshockstruts,incorporatedin eachlandinggear oleo assembly,absorbshock from wheelimpact on runway during landing.
NOTE: Service and adjust struts per placard on strut.
N.  Filling Oleo Struts
Fill oleo strut completelyas follows:
1.  
Place airplane on jacks(Referto 7-10-00).

2.  
Placepan under gearto catch spillage.

3.  
Openair valve slowly or depressvalvecore pin (asapplicable)to release strut pressure.

4.  
Removevalvecore pin.

5.  
Attach clear plastictubeto valve stem. Place oppositeendof tube in hydraulic fluid filled
container.

 

EFFECTIVITY:
040-999

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

N. Filling Oleo Struts (continued)
NOTE: An airtight connection is necessary betweenplastic tube and valve stem. Without an airtight connection, a small amount of air is drawn into oleo strut during each sequence, resulting in inordinate amountof air bubbles and prolonged filling operation.
6.  
Extendoleo strut by pulling down on wheel and drawing fluid into oleo strut. Continue compressingand extending oleo strut until it is full of fluid and air bubbles cease to appear in plastic tube.

7.  
Slowly compress strut to fully compressed position.

8.  
Remove plastic tube. Reinstall valve core (if applicable).

9.  
Inflateoleo struts according to information in Figure 12-2.

10.
Tighten air valve (if applicable).

NOTE: For accurate oleo strut inflation, the aircraft must be placed on jacks with the weight of the aircraft off of the wheels.
O.  Inflating Oleo Struts
Ensureoleo strut contains sufficient fluid (described in Landing Gear Oleo Struts). Attach strut pump to air valve and pump up oleo strut. Before capping valve, check for valve core leakage.
MAIN GEAR

FORSERVICE (SEE MAINTENANCE MANUALFOR SERVICINGWITH MIL -H -5606 (RED)HYDRAULICFLUID).WITH NO LOAD ONSTRUT,INFLATETO 435 psi.
INSTRUCTIONS
NOSEGEAR

FORSERVICE (SEEMAINTENANCEMANUALFOR SERVICINGWITHMIL-H -5606 (RED)HYDRAULICFLUID).WITH NOLOADONSTRUT,INFLATETO 350psi.
INSTRUCTIONS
ServicingLandingGearShockStruts
Figure 302

EFFECTIVITY:
12-10-00 Jan 0/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)

MAINTENANCEMANUAL
P. Tires
Tubelesstires are designed to permit any air or nitrogen that is trapped in the cords or that diffuses
through the liner to escape through special sidewall vents. This venting prevents pressurebuild-up
within the cord body which might cause tread, sidewall or ply separation. Discounting tire growth after
initial inflation, once the tire has been inflated, the maximum permissiblepressuredrop due to diffusion
is 5% in any 24 hour period.
Vent holes penetrate the sidewall rubber to, or into, the cord body and may vary in size, depth and angle. Therefore, the amount of diffusion through these holes will vary.
When water or a soap solution is brushed over the outside of an inflated tubeless tire, bubbles form.
Some vents may emit a continuous stream of bubbles. Others may produce intermittent bubbles. And
some may not bubble at all. This variety is normal and does not mean that there is anything wrong
　
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