288
THE HONG KONG GOVERNMENT GAZETTE, MARCH 25, 1937.
1208
1424
1514
1866H
2325
1210
1428
1516
1867H
2328
1214
1479
1562
1924
12. Certain airscrews of obsolescent design have already been withdrawn from use in accordance with the instructions given in Notice to Aircraft Owners and Ground Engineers No. 9/1934. These airscrews, the use of which is prohibited, are numbered as follows, each number being prefixed by the letters "F.R." :----
234
525
929H
1038
1188
328
639
940
1123
1189
478
767
969
1133
1194
502
802
993H
1135
1222
508
803
994
1136
1223
512
806
1006
1138
1224
516
809
1020
1140
1238
522
917H
1026
1146
523
926H
1035
1151
13. The Certificate of Airworthiness of an aircraft affected by this Notice will be liable to suspension or cancellation unless the first detail inspection has been made, or, where applicable, the requirements of para. 11 have been fulfilled, within one month of the date of this Notice: exception will be made where airscrews other than those quoted in paras. 10 and 11 have not yet completed a total of 200 hours flying, the allowable period being extended until this amount of flying has been completed. Certificates of Airworthiness will not be renewed and ground engineers must not sign Daily Certificates of Safety for Flight in respect of such aircraft after the expiration of the aforementioned periods, unless the requirements of this Notice have been fulfilled.
14. If damage occurs to Fairey-Reed metal airscrews, repairs must be effected at the maker's works, except when the repairs are confined to the removal of deep scratches or sharp-cornered indentations caused by foreign matter drawn into the blades during ground running. Examination of both faces and the leading and trailing edges of the blades is to be made at frequent intervals for such defects, which reduce the ability of the metal to withstand fluctuating stresses and may promote fatigue fracture.
15. When discovered, defects of this nature are to be removed by means of a file or coarse emery. In smoothing out the defects, the amount of metal removed is not to be more than is necessary to convert sharp nicks into smooth rounded depressions blending into the surrounding surface. Finally, the resulting surfaces are to be polished with fine emery to eliminate all marks left by the file or coarse emery.
16. If vibration is experienced with an airscrew from which defects have been removed, the airscrew is to be returned to the makers for examination and adjustment (see also para. 9).
17. Airscrews on which the scars are too numerous, or are of such a depth that their removal would seriously reduce the cross-sectional area of the blades, are to be withdrawn from use.
18. Cancellation.-Notice
to
Ground Engineers No. 5/1937 is hereby cancelled.
Aircraft Owners
and
G. F. HOLE,
Director of Air Services.
Hong Kong, 23rd March, 1397.