AD 70-25-06 ACTIVE

70-25-06 ROLLS-ROYCE DART: Amdt. 39-1119. Applies to Rolls-Royce Dart Models 542-4, 542-4K, 542-10, 542-10J, and 542-10K engines.

Compliance is required as indicated, unless already accomplished.

To prevent cracking and subsequent failure of the engine propeller shaft and damage to the coarse pitch oil line due to material inclusions in that part of the shaft between the annulus gear support diaphragms, accomplish the following:

(a) For all airplanes with Rolls-Royce Dart Models 542-4, 542-4K, 542-10, 542-10J, and 542-10K engines installed except those having engine propeller shafts installed which have been supplied by Rolls-Royce with "CU" marked on the front end of the shaft, or in which each engine propeller shaft has been overhauled (including ultrasonic inspection for cracks and material inclusions) in accordance with Rolls-Royce Dart Overhaul Manual O-DA.10-AC and identified with "CU" marked on the front end of the shaft, and which are not listed in paragraph(g) of this AD, within the Next 50 hours' time in service after the effective date of this AD, install the following placard in clear view of the pilot and as close to the R.P.M. indicators as practicable: "In the event of abnormal, short duration R.P.M. increase (500-600 R.P.M.) accompanied by a drop in TGT and torque pressure at a fixed power setting, immediately feather affected propeller per AFM feathering instructions."

(b) For engines which have been feathered in accordance with the placard in paragraph (a), overhaul the engine propeller shaft (including ultrasonic inspection) in accordance with Rolls-Royce Dart Overhaul Manual O- DA.10AC to determine whether material inclusions or cracks exist in that part of the engine propeller shaft between the annulus gear support diaphragms, and whether the propeller coarse pitch oil line has been damaged. If material inclusions or cracks in the propeller shaft or damage to the propeller coarse pitch oil line are found, before furtherflight replace the cracked propeller shaft and damaged propeller coarse pitch oil line with an approved serviceable part of the same part number.

(c) For all engines having propeller shafts with 1200 or more hours' time in service on the effective date of this AD, within the next 450 hours' time in service and thereafter at intervals not to exceed 1200 hours' time in service since the last inspection, inspect each engine propeller shaft (including ultrasonic inspection) in accordance with Rolls-Royce Dart Aero Engine Alert Service Bulletin Number Da 72-367, dated September 17, 1969, or later ARB-approved issue or an FAA-approved equivalent. If material inclusions or cracks are detected during any inspection, before further flight replace the engine propeller shaft with an approved serviceable part of the same part number.

(d) For all engines having propeller shafts with less than 1200 hours' time in service on the effective date of this AD, within a total of 1650 hours' time in service, and thereafter at intervals not to exceed 1200 hours' time in service since the last inspection, inspect each engine propeller shaft (including ultrasonic inspection) in accordance with Rolls-Royce Dart Aero Engine Alert Service Bulletin Number Da 72-367, dated September 17, 1969, or later ARB-approved issue or an FAA-approved equivalent. If material inclusions or cracks are detected during any inspection, before further flight replace the engine propeller shaft with an approved serviceable part of the same part number.

(e) For Rolls-Royce Dart Models 542-4 and 542-4K engines installed in Convair airplanes, the repetitive inspections required by paragraphs (c) and (d) may be discontinued when propeller shafts are installed which have been supplied by Rolls-Royce with "CU" marked on the front end of the shaft, or which have been overhauled (including ultrasonic inspection for cracks and material inclusions) in accordance with Rolls-Royce Dart Overhaul Manual O-DA.10-AC and identified with "CU" marked on the front end of the shaft.

(f) For all engines with propeller shafts installed bearing the serial numbers listed in paragraph (g), the placard required by paragraph (a) may not be removed until an FAA-approved inspection method has been developed to insure that the shafts are free from defects.

(g) For Rolls-Royce Dart Models 542-4 and 542-4K engine with propeller shafts installed bearing the serial numbers listed below and which are not installed in Convair airplanes and for all Rolls-Royce Models 542- 10, 542-10J and 542-10K engines with propeller shafts installed bearing the serial numbers listed below, the repetitive inspection required by paragraphs (c) and (d) may not be discontinued until an FAA-approved inspection method has been developed to insure that the shafts are free from defects:

INSPECTION OF DART PROPELLER SHAFTS IN INSTALLED ENGINES -
SHAFTS FROM TOP THREE INGOT POSITION

Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
HA.275
HD. 86
HE.111
HJ.135
HM.267
HR.536
HS. 8
HA.277
HD. 88
HE.115
HJ.138
HM.272
HR.547
HS. 11
HA.281
HD. 94
HE.121
HJ.143
HM.288
HR.551
HS. 13

HD. 95
HE.129
HJ.151
HM.289
HR.552
HS. 14
HB. 25
HD. 97
HE.135
HJ.153
HM.294
HR.553
HS. 16
HB. 29
HD.103
HE.139
HJ.157
HM.436
HR.580
HS. 24
HB. 30
HD.105
HE.141
HJ.165

HR.581
HS. 25

HD.107
HE.142
HJ.167
HR.315
HR.583
HS. 28
HC.846
HD.110
HE.143
HJ.168
HR.319
HR.592
HS. 29
HC.847
HD.117

HJ.173
HR.326
HR.595
HS. 30
HC.849
HD.119
HG.562
HJ.176
HR.337
HR.596
HS.129
HC.854
HD.373
HG.563
HJ.178
HR.345
HR.597
HS.131
HC.856
HD.376
HG.570
HJ.180
HR.346
HR.600
HS.139
HC.857
HD.377
HG.571
HJ.189
HR.439
HR.601
HS.140
HC.858
HD.391
HG.572
HJ.190
HR.442
HR.780
HS.142
HC.861HD.392

HJ.196
HR.447
HR.781
HS.149
HC.862
HD.394
HH.699
HJ.197
HR.448
HR.789
HS.150

HD.399
HH.700
HJ.199
HR.511
HR.980
HS.153
HD. 60
HD.401
HH.714
HJ.201
HR.513
HR.981
HS.156
HD. 61
HD.404
HH.715
HJ.207
HR.520
HR.989

HD. 62
HD.413
HH.716
HJ.212
HR.527
HR.993

HD. 67
HD.414
HH.717
HJ.218
HR.528
HR.995

HD. 69
HD.421
HH.719
HJ.219
HR.529

HD. 71
HD.425
HH.720
HJ.223
HR.532
HS. 1

HD. 73
HD.427
HH.721

HR.533
HS. 5

HD. 74

HM.266
HR.535
HS. 7

INSPECTION OF DART PROPELLER SHAFTS IN INSTALLED ENGINES -
SHAFTS FROM UNRECORDED INGOT POSITIONS

Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
Shaft Serial No.
HA. 28
HA.961
HC.577
HD.840
HH.670
HJ.957
HM.398
HA. 29
HA.962
HC.578
HD.841
HH.671
HJ.958
HM.399
HA. 30
HA.963
HC.579
HD.842
HH.672

HM.400
HA. 31
HA.964
HC.580
HD.843
HH.673
HM.355
HM.401
HA. 32

HC.581
HD.844
HH.674
HM.356
HM.402
HA. 37
HB. 35
HC.582
HD.845
HH.675
HM.357
HM.403
HA. 70
HB. 36
HC.850
HD.846
HH.676
HM.358
HM.404
HA. 71
HB. 37
HC.852
HD.847
HH.677
HM.359
HM.405
HA. 72
HB. 38
HC.853
HD.848
HH.678
HM.360
HM.406
HA. 73
HB. 39
HC.855
HD.849
HH.679
HM.361
HM.407
HA. 74
HB. 40
HC.859
HD.850
HH.680
HM.362
HM.408
HA. 75
HB. 41
HC.996
HD.851
HH.681
HM.363
HM.409
HA. 76
HB.975

HD.852
HH.682
HM.364
HM.410
HA. 77
HB.976
HD.807

HH.683
HM.365
HM.411
HA. 78
HB.977
HD.808
HH.638
HH.684
HM.366
HM.412
HA. 79
HB.978
HD.809
HH.639
HH.685
HM.367
HM.413
HA. 80
HB.979
HD.810
HH.640
HH.686
HM.368
HM.414
HA. 81
HB.980
HD.811
HH.641
HH.687
HM.369
HM.415
HA. 82
HB.981
HD.812
HH.642
HH.688
HM.370
HM.416
HA. 83
HB.982
HD.813
HH.643
HH.689
HM.371
HM.417
HA. 84

HD.814
HH.644
HH.690
HM.372
HM.418
HA. 85
HC.539
HD.815
HH.645
HH.691
HM.373
HM.419
HA. 86
HC.540
HD.816
HH.646
HH.692
HM.374
HM.420
HA. 87
HC.541
HD.817
HH.647
HH.693
HM.375
HM.421
HA. 88
HC.542
HD.818
HH.648
HH.694
HM.376
HM.422
HA. 89
HC.543
HD.819
HH.649
HH.798
HM.377
HM.423
HA. 90
HC.544
HD.820
HH.650
HH.799
HM.378
HM.424
HA. 91
HC.545
HD.821
HH.651
HH.800
HM.379
HM.425
HA. 92
HC.546
HD.822
HH.652
HH.801
HM.380
HM.426
HA. 93
HC.547
HD.823
HH.653
HH.802
HM.381
HM.427
HA. 94
HC.548
HD.824
HH.654
HH.803
HM.382
HM.428
HA. 95
HC.549
HD.825
HH.655
HH.804
HM.383
HM.429
HA. 96
HC.550
HD.826
HH.656

HM.384
HM.430
HA. 97
HC.558
HD.827
HH.657
HJ.944
HM.385
HM.431
HA.592
HC.559
HD.828
HH.658
HJ.945
HM.386
HM.432
HA.595
HC.560
HD.829
HH.659
HJ.946
HM.387
HM.433
HA.690
HC.561
HD.830
HH.660
HJ.947
HM.388
HM.434
HA.952
HC.562
HD.831
HH.661
HJ.948
HM.389
HM.435
HA.953
HC.563
HD.832
HH.662
HJ.949
HM.390

HA.954
HC.564
HD.833
HH.663
HJ.950
HM.391
HR.355
HA.955
HC.565
HD.834
HH.664
HJ.951
HM.392

HA.956
HC.566
HD.835
HH.665
HJ.952
HM.393

HA.957
HC.567
HD.836
HH.666
HJ.953
HM.394

HA.958
HC.568
HD.837
HH.667
HJ.954
HM.395

HA.959
HC.569
HD.838
HH.668
HJ.955
HM.396

HA.960
HC.576
HD.839
HH.669
HJ.956
HM.397

These numbers are listed in Appendices A and B of Rolls-Royce Dart Aero Engine Service Bulletin No. Da 72-367, Revision 2, dated February 18, 1970.

This supersedes Amendment 39-913, 35 F.R. 145, AD 70-2-3 as amended by Amendment 39-1056, 35 F.R. 12270.

This amendment becomes effective December 7, 1970.