75-16-18 DOWTY ROTOL: Amendment 39-2292. Applies to Dowty Rotol Propellers R245/4-40-4.5/13, R259/4-40-4.5/17 and R209/4-40-4.5/2 used on Convair 600 series and YS-11 series airplanes.
Compliance required as indicated within the next 300 hours propeller time in service after the effective date of this AD or before the accumulation of 5300 hours propeller time in service, whichever occurs later, unless already accomplished.
To prevent propeller blade failures from occurring in flight:
(a) Inspect and test the following serial number blades for cracks or forging defects in accordance with Appendix B of Dowty Rotol Alert Service Bulletin 61-A862, Revision 1, dated May 22, 1975, (hereafter Dowty Rotol Bulletin 61-A862) or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region, c/o American Embassy, APO New York, N.Y. 09667.
YS11 & 11A propeller blades with blade serial numbers:A124879
A125027
A125113
A125242
A125292
A12556
A125720
A124882
A125028
A125115
A125243
A125293
A125570
A125762
A124884
A125035
A125116
A125244
A125294
A125583
A125780
A124890
A125036
A125121
A125245
A125296
A125585
A125822
A124892
A125037
A125122
A125246
A125298
A125587
A125824
A124893
A125038
A125123
A125299
A125247
A125589
A125833
A124894
A125039
A125141
A125248
A125302
A125590
A125834
A124906
A125040
A125142
A125249
A125304
A125611
A125835
A124907
A125047
A125143
A125251
A125316
A125612
A125842
A124908
A125048
A125149
A125252
A125317
A125613
A125843
A124909
A125049
A125151
A125262
A125318
A125614
A125900
A124910
A125050
A125152
A125263
A125527
A125628
A125908
A124928
A125051
A125159
A125264
A125528
A125629
A125911
A124929
A125057
A125160
A125272
A125538
A125642
A125930
A125008
A125058
A125275
A125540
A125654
A125654
A125956
A125009
A125059
A125165
A125276
A125547
A12565
A125982
A125010
A125061
A125166
A125283
A125549
A125674
A125984
A125016
A125062
A125167
A125285
A125556
A125676
A125985
A125017
A125090
A125169
A125287
A125557
A125677
A125989
A125018
A125091
A125171
A125288
A125565
A125708
A126089
A125019
A125093
A125290
A125290
A125566
A125709
A126090
A125025
A125112
A125239
A125291
A125567
A125718
A126122
Convair propeller blades with blade serial numbers:
A125447
A125661
A125448
A125662
A125458
A125699
A125462
A125844
(b) If cracks or forging defects are found, comply with (1) or (2) as appropriate:
(1) Repair the blade in accordance with Appendix B of Dowty Rotol Bulletin 61-A862 or later FAA-approved revision or an FAA equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Region, c/o American Embassy, APO New York, N.Y. 09667.
(2) Remove the blade from service if repair cannot be made in accordance with paragraph (b)(1).
(c) Blades may be returned to service following inspection and test if found free of cracks or forging defects or have been repaired in accordance with paragraph (b)(1) of this AD.
This amendment becomes effective July 29, 1975.