Removal Of Controller; Installation Of Controller; Controller Filter Replacement - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Pressurization Control (continued)
13. Removal of Controller
(a) Disconnect lines from rear of cabin altitude controller assembly. Cap open parts of lines and
fittings to prevent dust from entering system.
(b) Remove screws securing electroluminescent panel to face of instrument panel.
(c) Remove three screws securing selector to instrument panels.
(d) Remove controller by lifting assembly from rear of instrument panel.
14 Installation of Controller
(a) From front side of panel, position controller into instrument panel cutout.
(b) Secure controller to instrument panel with three screws.
(c) Position electroluminescent panel to instrument panel and secure with screws previously
removed.
(d) Remove protective caps from selector lines and fittings. Connect lines to fittings on rear of
controller.
15. Controller Filter Replacement
A disposable tobacco filter, installed in the pressurization system must be replaced every 500
hours of normal operation. (Refer to the parts catalog for replacement filter part number.) More
frequent filter change and cleaning of the outflow and safety valve seats could be required
depending on the amount of smoking in the cabin.
Replace controller filter as follows:
(a) Remove filter, accessible from underneath instrument panel, from behind and discard.
(b) Install new filter.
EFFECTIVITY:
040-999
21-30-00
PAGE
27 21-30-OO Jan
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