§ 173.172 Aircraft hydraulic power unit fuel tank.
发布08-07
生效09-08
摘要总结AI 辅助解读
该条款规定了航空液压动力单元燃料箱（含无水肼与单甲基肼混合物，即M86燃料）在符合特定技术条件时，可豁免危险品规格包装要求。核心豁免条件包括：(a)铝制压力容器配焊接铝内胆，最大内体积46升，设计压力≥1275千帕，爆破压力≥2755千帕；或(b)铝制压力容器配弹性体密封内胆，最大内体积46升，设计压力≥5170千帕。两种情形均要求出厂及发货前检漏合格，使用不可燃缓冲材料（如蛭石）并装入坚固金属外包装，且每个初级容器及包装内的燃料最大量均为42升。
Aircraft hydraulic power unit fuel tanks containing a mixture of anhydrous hydrazine and monomethyl hydrazine (M86 fuel) and designed for installation as complete units in aircraft are excepted from the specification packaging requirements of this subchapter when they conform to either of the following conditions:
- (a) The unit must consist of an aluminum pressure vessel made from tubing and having welded heads. Primary containment of the fuel within this vessel must consist of a welded aluminum bladder having a maximum internal volume of 46 L (12 gallons). The outer vessel must have a minimum design gauge pressure of 1,275 kPa (185 psig) and a minimum burst gauge pressure of 2,755 kPa (400 psig). Each vessel must be leak-checked during manufacture and before shipment and must be found leakproof. The complete inner unit must be securely packed in non-combustible cushioning material, such as vermiculite, in a strong outer tightly closed metal packaging which will adequately protect all fittings. Maximum quantity of fuel per primary containment and package is 42 L (11 gallons); or
- (b) The unit must consist of an aluminum pressure vessel. Primary containment of the fuel within this vessel must consist of a welded hermetically sealed fuel compartment with an elastomeric bladder having a maximum internal volume of 46 L (12 gallons). The pressure vessel must have a minimum design gauge pressure of 5,170 kPa (750 psig). Each vessel must be leak-checked during manufacture and before shipment and must be found leakproof, and must be securely packed in non-combustible cushioning material, such as vermiculite, in a strong outer tightly closed metal packaging which will adequately protect all fittings. Maximum quantity of fuel per primary containment and package is 42 L (11 gallons).
[Amdt. 173-224, 55 FR 52643, Dec. 21, 1990, as amended at 66 FR 45380, Aug. 28, 2001; 87 FR 44993, July 26, 2022]