0007 00  TM 10-1670-287-23&P  MC-4 RAM AIR FREE-FALL PERSONNEL PARACHUTE SYSTEM  PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INTRODUCTION  GENERAL SCOPE MAINTENANCE FUNCTIONS/PROCEDURES PARACHUTE REPACK INTERVAL  DROP TESTING CRITERIA  END OF WORK PACKAGE 0007 00-1/(2 Blank)  Drop testing of the MC-4 Ram Air Personnel Parachute System consist of physically airdropping an item  from an aircraft in flight. The drop-test is used as a means of proving the serviceability of an item or  checking parachute rigger proficiency, and will only be performed under the supervision of qualified  parachute rigger personnel who satisfy the supervisory requirements outlined in AR 750-32 and TM 10- 1670-201-23. Drop testing will usually be conducted by an activity responsible for the inspection and  maintenance of airdrop equipment, which includes either parachute packing or airdrop load rigging. The  criteria required to accomplish a drop test is as follows:  The MC-4 parachute will be repacked at a scheduled interval to insure airworthiness. When necessitated  by climate/storage/use condition, the local airdrop equipment maintenance officer may require more  frequent repack intervals. In this regard, a major concern would be rapid fluctuations of temperature  (fluctuations around 32 degrees Fahrenheit, freezing point) sustained high or low temperature, or high  humidity and heavily polluted atmosphere. The MC-4 Ram Air Personnel Parachute System will be  repacked at a 120-day interval (both main and reserve).  Each of the mentioned work packages above identifies a maintenance function specified in the MAC. All  maintenance procedures required to complete a maintenance function are identified under THIS TASK  COVERS: in the order in which the work is most logically accomplished.  The following work packages (WP 0015 00 through WP 0059 00) contain maintenance procedures that  are the responsibility of the specified technician, as authorized by the Maintenance Allocation Chart  (MAC), and the Source, Maintenance, and Recoverability (SMR) coded items that are identified in the  Repair Parts and Special Tools List (RPSTL).  The following describe PMCS procedures on the unit and direct support levels. The PMCS table has  been provided to ensure the MC-4 parachute is in proper operating condition, and ready for its primary  mission.  1.  To drop-test a troop-type personnel parachute, a qualified parachute rigger will jump the  parachute and the applicable type parachute will be released under conditions that are consistent  with the requirements for a personnel jump or equipment drop.  2.  During the drop-test of any type parachute, the deployment of the parachute will be thoroughly  monitored and observed to detect any indication of malfunction or defect. A subsequent record of  the applicable parachute log record will be entered into the applicable log record using  procedures outline in WP 0004 00.  3.  Any type of airdrop equipment that indicates evidence of malfunction/defect during, or after, a  drop-test will be disposed of as prescribed in WP 0011 00.  4.  A personnel parachute that is considered to have contributed to the injury of an individual  parachutist (critical or fatal) will be disposed of in accordance with WP 0011 00, Equipment  Disposition. 5.  Airdrop equipment that does not reflect evidence of malfunction or defect upon completion of a  drop-test will be administered a technical/rigger-type inspection as outlined in WP 0011 00. If  serviceable, the item(s) may then remain in use. 