As discussed in the first post of this series, I agreed to a flat-rate payment of $2,657.40 covering the actual inspection of the aircraft and the basic preventive maintenance items that normally accompany it. We start from there.
Four work items added significant cost to this maintenance event. They were:
- Replace right elevator and stabilizer tips; replace failing right elevator spar rivets. The labor expended on this set of tasks was 7.1 hours at $86.00/hr. or $610.60 total and the cost of parts (primarily the plastic tips) was $287.44. Total cost = $898.04.
- Replace the muffler. Labor to disassemble the exhaust system, remove and replace the muffler, and reassemble, was 6.1 hours, $524.60. The new muffler's cost was $357.95. Total cost for the work item was $882.55.
- Perform 500 hour service on both magnetos. The labor cost was 3 hours for each mag, or $516.00 for both. The right mag needed a new distributor block ($363.43); the left mag needed points ($52.95), a carbon brush ($6.54) and a capacitor ($143.34). Total for parts was $566.26 for both mags; total parts and labor for servicing both magnetos was $1,082.26.
- Replace one worn seat roller housing. Labor of 0.7 hours, $60.20; cost of the part, $519.10. Total $579.30.
Additionally, there were a number of items that added up to another significant cost element: Replace alternator noise-supression capacitor ($93.99); Restore damaged paint on engine mount ($111.80); Remediate main landing gear corrosion ($129.00); Replace the brake linings ($247.32); Research logs for AD compliance, etc. ($318.20). Total for these = $900.31. So far, up to $6,999.86.
An assortment of minor items (clear a chafe here, stop drill a crack there, etc.) added in aggregate $692.55. The running total is now $7,692.41.
Finally, adding the post-maintenance run-up, cost of oil, shop consumables, inbound freight charges for parts, and the Airport Use Fee together $595.42 gets us to the total cost of the maintenance activity: $8,287.83. In today's market and based on N631S's equipment and condition, I'd estimate that to be in the neighborhood of 7.5% of the value of the airplane. As an annual maintenance cost for a 35 year-old machine that's acceptable.