4790.2 Vol Iii Appendix O General Work Unit Codes

Front 1

030

Back 1

Maintenance Inspections. Used for acceptance, transfer, and conditional inspections.

Front 2

040

Back 2

Corrosion Prevention. Used when documenting unscheduled corrosion prevention,
including unscheduled aircraft washing.

Front 3

049

Back 3

Preservation and Depreservation. Used when end items are preserved for temporary or long term
storage or shipment, and for depreservation. Refer to Chapters 6 and 9 for specific documentation
procedures.

Front 4

050

Back 4

General Functions. Includes aeronautical related functions, such as painting, stenciling, lettering,
and installing decals; fabric and metal tests; calibration of mechanical devices; reclamation and
salvage; local manufacture and fabrication; and oil analysis. Use code 050 only if none of the
following codes apply

Front 5

051

Back 5

Wheel and Tire Buildup and Teardown

Front 6

052

Back 6

Check, Test, and Service. Includes items other than those listed in code 050 or those power plant
and life support items listed under codes 060 and 080, respectively.

Front 7

060

Back 7

Propulsion System Support. Includes tasks such as the handling of engines, propellers and rotor
heads. Use the appropriate specific code from the following list; if none of these apply, use code
060.

Front 8

061

Back 8

Quick Engine Change Assembly and Quick Engine Change Kit Buildup and Teardown.

Front 9

062

Back 9

Propeller and Rotor Head Buildup and Teardown.

Front 10

063

Back 10

Engine Test Stand Operation.

Front 11

080

Back 11

Inspection of Aviators Equipment, Safety and Survival Equipment. For work in this general
category use the appropriate specific code from the following list; if none of these apply, use code
080.

Front 12

081

Back 12

Check, Test, Service, and Repack of Parachutes. Includes personnel, cargo, and drag parachutes

Front 13

082

Back 13

Check, Test, and Service of Flotation Equipment. Includes life rafts and life vests.

Front 14

083

Back 14

Check, Test, and Service of Personal Equipment. Includes torso harnesses, pressure suits, general
flight clothing, and helmets.

Front 15

084

Back 15

Check, Test, and Service of Oxygen Equipment. Includes oxygen masks, oxygen regulators, and
liquid oxygen converters.