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THE HONG KONG GOVERNMENT GAZETTE, FEBRUARY 19, 1937. 137
7. If no cracks are found, any attrition or corrosion marks are to be removed from the blade sheet and boss blocks by means of coarse emery followed by fine emery, and the airscrews are to be re-assembled. During the latter operation, a layer of tung oil varnish is to be inserted between the blade sheet and the boss blocks and care is to be taken to ensure even tightening of the bolts locating the blocks. When the bolts removed are of the obsolete type in which the nuts are secured by riveting, these are to be replaced by new bolts and self-locking nuts obtainable from the Fairey Aviation Co. Ltd.
8. When spinners are being re-assembled, care is to be taken to ensure that there is sufficient clearance between the blades and the spinner body to prevent chafing.
9. After re-assembly, and prior to further use, the air- screws must be ckecked for blade angles, track, alignment and static balance, if facilities are available. The blade angles at three-quarters of the maximum radius must not differ by more than 0°10′. The difference between blades, in track and alignment measured at the tip, must not exceed 1 inch and inch, respectively. The error in balance must not exceed 5 inch-ounces. Should facilities for the above tests not be available, ground tests on the engine, and if these are satisfactory, flight tests, are to be made to ascertain if the airscrew runs smoothly. If rough running is experienced, the airscrew is to be removed from the hub and the location bolts slacked off and then re-tightened. If, on further tests, rough running still persists, the airscrew is to be returned to the Fairey Aviation Co. Ltd., Hayes, Middlesex, for adjustment.
10. The airscrews which are to be subjected to detail inspection after periods not exceeding 50 hours flying are those numbered as follows, each number being prefixed by the letters "F.R." :-
371
1247
1469
1496
1566
2079
372
1248
1470
1498
1567 2080
491
1413
1471
1500
1568
2081
81.7
1414
1472
1502 1569
2082
927H 1415
1473
1504
1570
2083
950
1425
1474
1505
1760 2085
1135
1427
1475
1506
1761
2101
1189
1429
1476
1507
1762 2103
1191
1460
1477
1508
1862H 2105
1193
1461
1481 1509
1863H 2274
1204
1462
1484
1510
1864H 2278
1205
1463
1487
1512
1865H 2321
1233
1464 1488
1513
1925H 2323
1243
1465
1491
1515
1929
2324
944
1466
1493 1560
2036
2326
1245
1467
1494
1246
1468
1561 2038 2327 1495 1564 2039 2686
and
any of the airscrews quoted in para. 11 which are declared serviceable after inspection by the makers.