PIPER SENECA II SERVICE MANUAL
01/01/09 VII - LANDING GEAR AND BRAKE SYSTEM
1K18A
7-24a. MAIN LANDING GEAR TRUNNION ATTACH FITTINGS HARDWARE 100 HOUR INSPECTION.
For airplanes which have not complied with Part II of Piper Service Bulletin No. 956 or completed the
hardware replacement in paragraph 7-24b, each 100 hours time-in-service, inspect the Main Landing
Gear Trunnion Attach Fittings Hardware as follows:
NO
TE: Replacement of attaching hardware per paragraph 7-24b relieves this repetitive inspection
requirement.
a. Using a calibrated torque wrench, verify that the torque on all four attachment bolts on each of the
four main gear trunnion attach fittings is between 50 and 70 inch pounds.
b. If any of the bolt torques are found to be less than 50 inch pounds, comply with paragraph 7-24b.
prior to further flight.
NO
TE: If loose bolts can be re-torqued to 50 to 70 inch pounds and there is no damage to the
attach fittings or surrounding structure, the aircraft may make a repositioning flight to a
facility where paragraph 7-24b can be accomplished.
c. If bolts are properly torqued, make a logbook entry of compliance with this inspection.
7-24b. MAIN LANDING GEAR TRUNNION ATTACH FITTINGS HARDWARE REPLACEMENT.
Number in parentheses refer to Item #’s in Figure 7-6. Likewise, hardware callouts (e.g., bolts, washers,
and nuts) refer to hardware specified in Figure 7-6.
NO
TE: Replacement of attaching hardware described herein relieves the repetitive inspection
requirements in paragraph 7-24a.
a. Place the aircraft on jacks.
b. Remove the main landing gear and forward (16) and aft (1) trunnion attach fitting assemblies per
paragraph 7-22.
c. Clean and inspect the trunnion attach fittings using a dye-penetrant method. Replace any cracked
fittings.
d. For each forward trunnion attach fitting:
1. Remove two of the four nutplates used to attach the fitting assemblies by drilling out the
MS20426AD3 attaching rivets.
2. Temporarily reinstall the fitting to the two remaining nutplates using the original equipment
AN4 attach bolts.
3. 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.
4. Remove the fitting and install new NAS680A5 nutplates (P/N 506-510) using MS20426AD4
rivets.
5. Temporarily reinstall the fitting with two of the new bolts and repeat steps 3 and 4 for the
remaining holes.
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