Piper SENECA II - Page 405

PIPER SENECA II SERVICE MANUAL
VII - LANDING GEAR AND BRAKE SYSTEM 01/01/09
1K18B
e. Alternate procedure for step d.
In some aircraft, installation of de-icing equipment, auxiliary fuel and other options makes access to
the nutplates for rivet installation extremely difficult. Accordingly, MS20365-524C fiber lock nuts
may be used in lieu of the nutplates per the following alternative instructions:
1. Fill the rivet holes used to mount the nutplates with NAS1739B3 or NAS1739B4 blind,
countersunk rivets of appropriate length.
2. Secure the fitting attaching bolts using MS20365-524C fiber lock nuts (P/N 404-889) and
AN960-516 washers (P/N 407-566).
f. For each rear trunnion attach fitting:
1. Temporarily reinstall the fitting using two of the original equipment AN4 bolts and nuts.
2. Match-drill and ream the two open fitting attach holes to 0.312 inch (+/-.0015 inch).
NO
TE: If new trunnion attach fittings are being installed, the fitting holes are already reamed
to .312 inch. To accurately align the fitting with the existing holes, wrap the grip of
the old AN4 attach bolts with .032 brass safety wire to act as a temporary bushing.
3. Temporarily install two of the new bolts into the new holes; remove the AN4 bolts and repeat
step b.
g. Remove all fittings, de-burr all holes and touch-up with corrosion preventative primer.
h. Reinstall the forward fittings using new bolts and washers and reinstall the rear fittings using new
washers and nuts. Torque per Table II-IV and Figure 7-6.
i. Reinstall, rig and test the landing gear per paragraphs 7-23, 7-24 and 7-40a.
j. Remove the aircraft from jacks.
k. Make airframe logbook entry of compliance with this inspection.
NO
TE: There is a 0.060 inch relief cut made into the upper main spar cap reinforcement angle,
from the edge of the angle into the 0.250 inch trunnion attach fitting bolt holes. This relief
cut is partially covered by the existing nutplates and was intentionally done during
manufacture. This relief cut is not a crack and enlarging the bolt holes per instructions
above will not affect the designed integrity of the attachment.