Disconnecting Test Unit; Hydraulic Test Unit (Optional); Identification Of Power Packs; Identification Of Power Pack - Piper Navajo Chieftain PA-31-350 Service Manual

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Figure 6-4. Identification of Power Pack
6-17. DISCONNECTING TEST UNIT.
a.
Ascertain that the landing gear selector handle is in the down neutral position, and that the
landing gear is down and locked.
b.
Shut down the test unit per instructions supplied with unit.
c.
Close the suction, fill and drain valve in the airplane by placing the control lever in the down
position.
d.
Disconnect the test unit hose from the fitting and reinstall the protective cap over the fitting.
e.
Disconnect and remove the test unit pressure hose from the pressure fitting in the airplane if
previously connected and reinstall the protective cap on the fitting.
f.
Check fluid level in the power pack reservoir and check system for leaks.
g. Install the access panel on the right side of the nose section.
6-18. HYDRAULIC TEST UNIT (OPTIONAL). Multi-purpose hydraulic test units can be used to provide
the same functions as the Piper unit; however, the test unit must be capable of duplicating and monitoring
the operating pressures and flow rate given in Table VI-I or VI-II.
6-19. IDENTIFICATION OF POWER PACKS. The manufacturer's identification placard located on the
power pack reservoir body as shown in Figure 6-4 should be used to determine which power pack is in the
airplane being serviced. The placard furnishes the part number, revision letter, and serial number of each
unit, plus the operating pressure of the power pack.
Reissued: 9/23/80
HYDRAULIC SYSTEM
2A24