Los Angeles Municipal Code § 57.2004 Aircraft Maintenance

Section 2004 of the CFC is hereby adopted in its entirety with the following exceptions, modifications, and additions.

Maintenance of aircraft fuel systems shall comply with Sections 57.2004.8.1 through 57.2004.8.6.

Any person conducting aircraft servicing, maintenance, or testing of the fuel system using the air ventilation procedures, shall reduce the fuel tank atmosphere to below 20% of the lower flammable limit of the fuel vapors. Air ventilation, as used herein, means to pass undiluted air (air not containing flammable vapors) through an aircraft fuel tank to render the atmosphere of the tank below the lower flammable limit of the fuel vapors involved. Before any inspection or work is performed, tests by a qualified person shall be conducted to determine that the presence of flammable vapors in or around the fuel tank does not constitute a fire or explosion hazard. This condition shall be maintained throughout the period of inspection or work.

All open flame and spark producing devices within flammable vapor areas shall be shut down and shall not be operated while air ventilation is occurring.

Electrical equipment used in the flammable vapor areas shall be approved for use in Class I, Group D, Division 1 Hazardous Locations, as defined in Chapter 9 of the Los Angeles Municipal Code (Electrical Code).

To guard against static spark hazard, exhaust equipment and the aircraft to be ventilated shall be electrically bonded and adequately grounded. If ducting is used, a static bonding wire shall be connected from each exhaust hose nozzle to the aircraft wing before opening the fuel tank.

Aircraft electrical circuits which are in flammable vapor areas shall be de-energized.

Suitable warning signs shall be placed in conspicuous locations around the aircraft to indicate that tank ventilation is in progress.