236522-1937-Notice-to-Aircraft-Owners-and-Ground-Engineers-No-14-of-1937 — Page 2

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THE HONG KONG GOVERNMENT GAZETTE, SEPTEMBER 17, 1937.

(c) The lifebelt should be subjected to an inflation test every three months. It should remain inflated for 48 hours and the material should be examined for deterioration. The inflation pressure applied should never exceed -lb. per square inch, which is sufficient to cause the belt to take its normal shape. During this test the belt should not be immersed in water.

(4) to ensure that the cylinders are fully charged, they should be checked by weight. Two types of gas cylinder are supplied:-

No. 1; plain cylinder, gross weight 100 grammes.

No. 2; encircled by a milled band, gross weight 95 grammes.

A loss in weight of more than 5 grammes from either type indicates that the cylinder should be re-charged.

(e) When screwing the cylinder into position, care should be taken to ensure that it is not screwed so tightly as to strain the gas capsule and cause leakage. If the cylinder is not screwed sufficiently the plunger may fail to pierce the capsule when the lever is operated. The cylinder, when in position, should be finger tight only.

(ii) The “Airvelope” (Service Type).

(a) The "Airvelope" lifebelt consists of a light sleeve- less waistcoat of waterproof material, buoyancy being secured by insertions of kapok and an air buoyancy chamber in the form of a stole. The latter is inflated by the wearer through a mouthpiece.

(b) When removed from the aircraft, the lifebelt should be stored in a cool, dry place and should be partially inflated. (c) Every three months the lifebelt should be examined for deterioration and the stole removed and subjected to an inflation test. The air inflation pressure for such examination should not exceed 1 lb. per square inch, as it is only necessary to inflate the stole until it takes its normal shape.

(iii) The Imperial Airways chair upholstery lifebelt.

(a) The lifebelt consists of two cushions joined together which form the seat and back cushions of cabin chairs in Imperial Airways' aircraft. The cushions consist of inflatable padded rubber air tubes contained in fabric covers which can be removed for inspection purposes. Suitable loops for the wearer's armis are arranged on the sides of the cushions. The lifebelt is donned as a jacket and is fastened in front with two snap hooks.

(b) When removed from the aircraft the lifebelt should be stored in a cool, dry place and should be partially inflated. (c) The belt should be examined every three months for deterioration.

(iv) Life jackets approved by the Board of Trade.

(a) A number of non-inflatable life jackets are approved by the Board of Trade. Particulars of these life jackets are given in Chapter X of the Board of Trade Survey of Life Saving Appliances. Any of these life jackets is approved for use in civil aircraft provided it has been stamped by a Board of Trade surveyor.