What was found
(CAN) REFERENCE: IPC FIG 82 ITEMS 23, 29, AND 57. DURING 50 HR INSPECTION FOUND SHIELD P/N 41604-01 WITH 6 CHERRY MAX RIVETS PULLED OUT WHICH SECURES HEAT SHIELD TO SKIN P/N 41667-08 AND ANGLE P/N 40667-1 ON RT NACELLE. HEAT SHIELD SHOWS TO HAVE BEEN EITHER PREVIOUSLY REPLACED OR RE-INSTALLED. NO RECORDS FOUND. COULD HAVE BEEN AS A RESULT OF IMPROPER INSTALLATION. ALSO NOTE PILOT'S INTERPRETATION OF 'EXERCISING PROPELLERS' MAY BEING DONE AT A MAX OF 500 RPM INSTEAD OF A MAX OF 200 RPM DROP.