PIPER COMANCHE SERVICE MANUAL NOTES: I. Refer to the last card of the Piper Parts Price List - Aerofiche, for a checklist of current revisie dates to Piper inspection reports and manuals. 2. All inspections or operations are required at each of the inspection intervals as indicated by a (0). Both the annual and 100 hour inspections are complete inspections of the airplane, identical in scope, while both the _ and 1000 hour inspections are extensions of the annual or 100 hour inspection, which require a more detailed examination of the airplane, and overhaul or replace- ment of some major components. Inspections must be accomplished by persons authorized by the FAA. 3.
Piper service bulletins are of special importance and Piper considers compliance mandatory. 4. Piper service letters arc product improvements and service hints pertaining to servicing the airplane and should be given careful attention. S. Intervals between oil changes can be increased as much as 100%on enaines equipped with fullflow (cartridge type) oil filters, provided the element is replaced each SO hours of opera- tion. ' 6. Replace or overhaul as required or at engine overhaul (for ensine overhaul, refer to latest revision of Lycoming Service Letter L201). 7. Replace flexible oil lines at engine TBO per latest revision of Lycoming Service Bulletin 240. 8.
Inspections given for power plant are based on the engine manufacturer's operator's manual (Lycoming Part No. 60297-19). Any chanles issuedto the enaine manufacturer's operator's manual supersede or supplement the instructions outlined in this report. occasionally, service bulletins or service instructions are issued by Avco Lycomina Division that require inspection procedures that are not listed in this manual. Such publications usually are limited to specific models and become obsolete after corrective steps have been accomplished. All such publications arc available from Avco Lycoming distributors, or from the factory by subscription.
Consult latest revision of Lycoming Service Letter L114 for SUbscription information. Maintenance facilities should have an up-ta-date file of these publications available at all times. .- 9. Check cylinders for evidence of excessive heat indieated by burned paint on the cylinde This condition is indicative of internal damage to the cylinder and, if found, its cause must b determined and corrected before the aircraft is returned to service.
Heavy discoloration and appearance of seepage at the cylinder head and barrel attachment area is usually due to emission of thread lubricant used during assembly of the barrel at the facotyr, or by slight gas leakage which stops after the cylinder has been in service for awhile. This condition is neither harmful nor detrimental to engine performance and operation. If it can be proven that leakage exceeds these conditions, the cylinder should be replaced. 10. At every 400 hours of engine operation, remove the rocker box covers and check for freedom of valve rockers when valves are closed.
Look for evidence of abnormal wear or broken pans in the area of the valve tips, valve keeper, sprinp and SPrinl seal If any iridications are found, the cylinder and all of its components should be removed (including the piston and connectin. rod assembly) and inspected for further damase. Replace any parts that do not conform with limits shown in the latest revision for Service Table of Limits SSP 1776. 11. Refer to section VI of PA-24 Service Manual for proper inspection and wear limits. 12. Replace bungee cords every SOO houn in service or every three years, whichever occurs first. 13. For PA-24-400, refer to latest Piper Service Letter 8Sl. 14.
Refer to latest revision of Piper Service Bulletin 354. Interim Revision: 9/21/86 tE4 INSPECTIO'