AD 79-21-01 R1

Airworthiness directive · Third Stage Turbine Wheel Blade · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 3 more

Effective
June 3, 1981
Models
250-B17, 250-B17B, 250-B17C, 250-C20, 250-C20B, 250-C20C (T63-A-720)
Registered aircraft
1,074 matched by model
Product
Engine
Amendment
39-4123

Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.

On this page

Affected TCDS · 2

The type certificate data sheets for the models this AD names, matched by model and maker.

Registered aircraft · 1,074

Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.

By aircraft maker
  • Bell565 aircraft
  • Hughes Helicopters145 aircraft
  • Mcdonnell Douglas Helicopter79 aircraft
  • MD Helicopters44 aircraft
  • Hughes35 aircraft
  • Other makers44206 aircraft
By year built
19472021
Registered aircraft by year built: 947 aircraft
19471
19581
19602
19611
19625
19631
19641
19653
19664
19676
196811
19699
197014
197119
197223
197321
197430
197524
197634
197743
197842
197961
198064
198175
198252
198315
198414
198516
198614
19878
198822
198926
199017
199121
199220
199324
199434
199543
199617
199718
19989
19996
200017
200115
20028
20032
20042
20053
20073
200810
20094
20101
20123
20132
20143
20181
20201
20211

127 with no year recorded

By model

Aircraft

See all 1,074 aircraft