When an integral fuel cell has been repaired, it must be pressure checked before it is filled with fuel. Since the pressure testing procedure will vary with different types of aircraft, you should always consult the structural repair manual for the aircraft concerned for the proper procedure. The following equipment is used for pressure testing as system:

A source of nitrogen and a means of regulating the nitrogen pressure

NOTE: The use of nitrogen for pressure testing the fuel system is recommended since nitrogen is an inert gas, and therefore presents no explosive hazard when it is introduced into a fuel cell containing fuel vapors. A source of dry air is not recommended because it would increase the ratio of oxygen to fuel vapor in the cell, and the possibility of an explosion would be increased.

Suitable hoses and fittings to connect the testing equipment to fuel the system

0 to 5 psi pressure gauge installed downstream of the nitrogen supply

Miscellaneous plugs and caps for blocking various lines and fittings

RECOMMENDED READING LIST 

NOTE: need to be sure that you are studying the latest revision. Blueprint Reading and Sketching, NAVEDTRA 10077-F1, Naval Education and Training Program Management Support Activity, Pensacola, Florida, July 1988.

Fluid Power, NAVEDTRA 12964, Naval Education and Training Program Management Support Activity, Pensacola, Florida, July 1990.

Naval Aviation Maintenance Program, OPNAVINST 4790.2 (series), Office of the Chief of Naval Operations, Washington, D.C.

Aviation Hydraulics Manual, NAVAIR 01-1A-17, Commander, Naval Air Systems Command, Washington, D. C., 1 February 1992.

General Manual for Structural Repair, NAVAIR 01-1A-1, Commander, Naval Air Systems Command, Washington, D. C., 15 July 1969, Change 11, 15 August 1989.

Technical Manual Structural Hardware, NAVAIR 01-1A-8, Commander, Naval Air Systems Command, Washington, D. C., 1 September 1980, Change 24, 15 October 1987.

Program Manual For Forces Afloat OPNAVINST 5100.19A, Commander, Naval Air Systems Command, Washington, D. C., January 1983.

Program Manual, OPNAVINST 5100.23B, Commander, Naval Air Systems Command, Washington, D. C., August 1988.

Technical Manual Weight and Balance Data, NAVAIR 01-1B-40, Commander, Naval Air Systems Command, Washington, D. C., 1 October 1990.

Organizational, Intermediate, and Depot Maintenance Inspection and Proofload Testing of Lifting Slings and Restraining Devices for Aircraft and Related Components, January 1980, RAC4, 15 December 1988.

Technical Manual Maintenance Instructions Organizational, Intermediate, and Depot, Aircraft Fuel Cells and Tanks, Washington, D.C., 1 July 1986.