CS 31HB.47 Heater system

• ED Decision 2009/005/R found in: CS-31HB Amdt 1 - Hot Air Balloons (Dec 2011)

CS 31HB.47 Heater system ED Decision 2009/005/R (a) The system must be designed and installed so as not to create a fire hazard. (b) Parts adjacent to a heater (and if applicable, its flame) and the occupants must be protected from excessive heat. (c) There must be controls, instruments, or other equipment essential to safe control and operation of the heater system. They must be shown to be able to perform their intended functions during normal and emergency operation. (1) Where a heater system has more than one fuel supply or more than one control on each fuel supply, there must be unambiguous means to differentiate between each control, its source of supply and its function. (See [AMC 31HB.47(c)(1)](#_DxCrossRefBm388745791)) (2) The heater system must have a device or other means to indicate the quantity of fuel available. (See [AMC 31HB.47(c)(2)](#_DxCrossRefBm388745782)) (3) For a burner, each control system must have a device that indicates whether the heat output is high, normal or low. (See [AMC 31HB.47(c)(3)](#_DxCrossRefBm388745790)) (d) The reliability of the heater system must be substantiated by a test designed to reflect the limiting conditions likely to be encountered in service, both in kind and duration. (1) For a burner, the test must include at least three flameouts and restarts. (2) Each element of the system must be serviceable at the end of the test. (e) For a burner, the pilot light (or other means of ignition) must be shown to operate reliably in typical gusts and rain, must be readily accessible for relighting and must be easily relit. Continued operation of a heater must be possible in the event of a sustained pilot light failure. (f) Except in single-occupant balloons, the heater system must be designed so that in the event of any single failure, it will retain sufficient heat output to maintain level flight. (See [AMC 31HB.47(f)](#_DxCrossRefBm388745789))