Manifold Pressure Gauge Filters; Gyro Installation Inspection; Gyro Handling And Shipping - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
d. Installation of instruments will be in the reverse given for removal. After the installation is
completed and before replacing the instrument face panel, check all components for security and clearance of
the control column.
10-96. MANIFOLD PRESSU RE GAUGE FILTERS. The manifold pressure gauge has two filter assemblies
secured to the rear of the gauge. The removal of the top instrument access panel is necessary to gain access to
the filter assemblies. Remove the two filter assemblies and replace the filter elements during the 500 hour
inspection of the airplane, or sooner, if conditions indicate a restricted filter element.
10-97. GYRO SERVICE PROCEDURE.
10-98. GYRO INSTALLATION INSPECTION. The following inspections should be made before removing
a suspected gyro instrument from the airplane.
Visual Examination:
a. Has the instrument been modified?
b. Has the instrument been damaged?
c. Does the instrument show any signs of abuse?
Installation Inspection:
a. Are all pressure and static lines free from bends, restrictions or leaks?
b. Has the air filter been replaced?
c. Is the instrument properly mounted in the panel?
d. Does the instrument physically touch other intruments, tubing or airframe members when
the engines are started or stopped?
e. Are unused ports correctly sealed against air leaks?
f. Is the system pressure correct, and does the pressure gauge give an accurate reading?
g. Is the pressure regulator adjusted correctly and functioning properly?
h. Is proper voltage available?
i. Is electrical grounding intact?
j. Is circuit breaker correct or faulty?
k. Are all electrical plugs and connections secure?
10-99. GYRO HANDLING AND SHIPPING. The following information applies to all three inch
directional gyros and attitude horizon instruments installed by the factory or a Piper field service facility.
Gyro instruments being returned to the factory are to be placed in approved containers with all ports
properly sealed immediately after removal from the aircraft instrument panel. The instrument must also be
accompanied by factory copies of the warranty and credit claim forms. These forms and the special containers
should be available at any Piper Dealer and/or Distributor. Should any gyro instrument be received by
the factory in an unapproved container or if the ports are not sealed, the warranty will be immediately voided
and the instrument returned to the sender. The instrument must be returned immediately after removal from
the aircraft (not to exceed 15 days following discovery of defect).
Revised: 10/15/82 INSTRUMENTS
3C4