Piper Navajo PA-31 Service Manual page 643

PIPER NAVAJO SERVICE MANUAL
c. The use of teflon tape on gyro fitting threads is recommended and should be installed
in the following manner.
1. Carefully lay teflon tape on the threads, allowing one thread to be visible from the
end of the fitting. Hold in place and wrap in the direction of the threads, so tape will remain
tight when fitting is installed.
2. Apply sufficient tension while winding, to assure that the tape forms into threads
grooves. One full wrap plus ½" overlap is sufficient.
3. After wrap is complete. maintain tension and tear tape by pulling in direction of
wrap. The ragged end is the key to the tape staying in place. ( If sheared or cut tape may loosen.)
4. Press tape well into threads.
5. Screw fitting into part being careful not to exceed torque requirements as noted on
decal located on cover of gyro.
10-11. GYRO SERVICE PROCEDURE.
10-12. 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 central air filter been replaced?
c. Is the instrument properly mounted in the panel?
d. Does the instrument physically touch other instruments, 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?
10-13. 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).
Reissued: 10/12/79
INSTRUMENTS
3D5