MC1-1C/MC1-1D TROOP BACK PARACHUTE ASSEMBLY
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INTRODUCTION
0005 00-1/(2 Blank)
The following describe PMCS procedures on the unit and direct support levels. The purpose of PMCS is to
ensure the 28-Foot Diameter Cargo Extraction parachute is in proper operating condition, and ready for its
The following work packages (WP 0007 00 through WP 0052 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).
Each of the mentioned work packages above identifies as 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.
PARACHUTE REPACK INTERVAL
The 28-Foot Diameter Cargo extraction parachute will be repacked at a scheduled interval to ensure
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 28-Foot Diameter Cargo Extraction parachute will be
repacked at a 365-day interval. However, the repack cycle of the 28-Foot Diameter, Cargo Extraction
Parachutes stored in Depots and facilities that maintain contingency stocks of 28-Foot Diameter Extraction
Parachute, that are specifically identified as PACKED FOR CONTINGENCY and stored separately from
normal parachute stock, will be repacked at a 144-month interval. This is only to occur providing the storage
conditions are IAW this TM and TM 10-1670-201-23.
DROP TESTING CRITERIA
Drop-testing the 28-Foot Diameter Cargo Extraction parachute consists 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. 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:
1. 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. Any defect or malfunction
detected in a drop test will be annotated in the log record book using procedures outlined in WP 0003
00, SERVICE UPON RECEIPT.
2. 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 0009 00, INSPECTION.
3. 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 0009 00, INSPECTION.
If serviceable, the item(s) may then remain in use.
END OF WORK PACKAGE