THE HONG KONG GOVERNMENT GAZETTE, JULY 16, 1937.
550
No. 492.
DIRECTORATE OF AIR SERVICES,
HONG KONG.
Notice to Aircraft Owners and Ground Engineers.
No. 13 of the year 1937.
VARIABLE PITCH AIRSCREWS AND THEIR CONTROLS :
DUTIES OF GROUND ENGINEERS.
1. The Air Navigation Directions, 1932 require that the daily certification in respect of each aircraft engine and engine installation, shall be made by a ground engineer licensed in Category "C".
2. The duties devolving on ground engineers dealing with variable pitch airscrews which are fitted to aircraft engines, or are undergoing repair or overhaul, are shown hereunder.
3. The holder of a valid "C" licence with endorsement permitting certification of a variable pitch airscrew, will, in regard to such airscrew, be responsible for verifying the safety of details and assembly of the airscrew and its controlling mechanism, for effecting checks of correct balance, and for verifying the proper attachment and functioning of the airscrew and control to the engine. Such licensee may certify the correct assembly of an airscrew and controlling mechanism after the renewal of parts not involving fitting or machining operations, and the rectification of minor damage to the edges and faces of solid metal blades. The correction of distorted blades may not be certified by such licensee.
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4. The holder of valid "X" licence in respect of variable pitch airscrews may, in addition to certifying the work shown in the preceding paragraph, also certify major overhauls such as include the assembly of new parts requiring fitting or machining operations and the rectification of distorted blades within "cold setting" limits.
5. In order to give effect to the changes brought about by the introduction of variable pitch airscrews, all existing "C" licences at the time of renewal and new "C" licences at the time of issue, will be endorsed to exclude the certifica- tion of variable pitch airscrews in these instances where the holder of the licence has not passed the examination relating to the certification of such airscrews.
6. The holder of a valid "D" licence is required to verify the correctness of assembly and functioning of such variable pitch airscrew controls as are incorporated in the engine whenever these controls are disturbed.