Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
VA - HYDRAULIC SYSTEM 07/15/06
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c. Move the actuator on its mounting brackets to allow the manual control push rod to have maximum
clearance from the left stabilator cable and center in the fairlead on the aft face of the main spar
box. Check system for sufficient travel and freedom of movement of controls. Tighten actuator
attaching hardware.
NOTE: Care should be used when attaching the forward hose (13) to the diaphragm assembly (10)
so that no strain is placed on the teflon bushing ( 15) and diaphragm shaft ( 16), thus
causing friction in movement.
d. Connect hydraulic tubes (26, 39, 40 and 41) to cross (38) and tee (46).
e. Connect the pressure (13) and static (11) hoses to the elbows (12) of the diaphragm housing ( 10).
Secure hoses with clamps.
f. Connect the actuator electrical leads terminal to their mating terminals and insulate. Refer to the
electrical schematic for hookup.
g. Check the actuator adjustments as given in Paragraph 5A-14.
h. Check to ensure that maximum distance between end of link (18) and teflon bushing (15) does not
exceed .65 inch. Override must be engaged for this check. Make any adjustments at the control
cable assembly connector located at the spar box linkage. (Refer to Figures 5A-7, detail B, and 5A-
2, Note 1.)
i. Install floorboard and center seats.
5A-14. CHECK AND ADJUSTMENT OF GEAR BACK-UP EXTENDER ACTUATOR. (Refer to Figure
5A-7.)
a. If diaphragm failure is suspected note the following:
1. If the landing gear retracts or extends at too high an airspeed or will not retract at all unless the
back-up extender is placed in the override position, then the diaphragm is possibly defective.
2. If it is determined that the diaphragm is defective, then remove the Back-Up Extender per
instructions given in Paragraph 5A-12 and install, Piper Kit No. 761 138V, Back-Up Gear
Extender Diaphragm Replacement. Instructions for installing the diaphragm are included in the
kit.
3. Following completion of Replacement Kit, reinstall the extender unit in the aircraft and
functionally test and adjust as outlined below and in Paragraph 5A-14a.
b. Adjustment of the gear back-up extender actuator is preset to allow the hydraulic valve (25) of the
actuator to open when the airspeed is reduced below 118 MPH (103 Kts) with the engine power
OFF. This adjustment is accomplished by setting the tension of spring (24) on the actuator with
adjustment screw (2) as follows:
NOTE: The airspeed at which the hydraulic valve of the actuator opens was preset at the factory
under ideal conditions. There could be some variations at different altitudes and
atmosphere conditions.