AD 78-19-01

78-19-01 ROLLS-ROYCE LIMITED (Formerly Rolls-Royce (1971) Limited): Amendment 39-3297. Applies to Model RB-211-22B engines which have high pressure turbine discs, part number and serial number as indicated, installed.

Compliance is required as indicated, unless already accomplished.

To ensure adequate life limit margin for, and to prevent failure of the high pressure turbine discs listed herein, accomplish the following:

(a) Permanently remove from service the following high pressure turbine discs before or upon reaching the flight cycle life limit shown.

Part No. Serial No. Revised Life Limit Flight cycles LK48423 CQDY 107 2900 LK48423 CQDY 140 2900 LK48423 CQDY 130 2900 LK48423 CQDY 133 2900 LK48423 CQDY 134 2900 LK48423 CQDY 233 2900 LK53204 CQDY 334 4350 LK53204 CQDY 345 4350 LK53204 CQDY 389 4350 LK53204 CQDY 417 3500 LK53204 CQDY 419 4350 LK53204 CQDY 426 4350 LK53204 CQDY 427 3500 LK53204 CQDY 436 2500 LK53204 CQDY 449 4350 LK53204 CQDY 540 4350 LK53204 CQDY 578 3000 LK53204 CQDY 579 3000 LK53204 CQDY 581 4350 LK53204 CQDY 583 3500 LK69209 A2 CQDY 592 4350 LK53204 CQDY 624 2900 LK53204 CQDY 625 4350 LK53204 CQDY 627 3500 LK53204 CQDY 630 3600 LK53204 CQDY 631 4350 LK53204 CQDY 655 3500 LK53204 CQDY 702 4350 LK53204 CQDY 703 3500 LK53204 CQDY 712 4350 LK53204 CQDY 730 3500 LK69209 CQDY 740 4350 LK62143 CQDY 757 2250 LK53204 CQDY 770 4350 LK53204 CQDY 771 4350 LK53204 CQDY 805 2400 LK58998 CQDY 958 2250 LK58998 CQDY 964 2250 LK53204 CQDY 965 2250 LK58998 CQDY 976 2250 LK58998 CQDY 989 2250 LK69213 CQDY 996 4360 LK58998 CQDY 998 2250 LK58998 CQDY 1002 1200 LK58998 CQDY 1037 2250 LK58998 CQDY 1076 2250 LK58998 CQDY 1140 2250

NOTE: Rolls-Royce Limited Service Bulletin RB.211-72-4300, Revision 3, dated May 12, 1978, pertains to this same subject.

(b) Permanently remove from service the following high pressure turbine discs before or upon reaching 2900 flight cycles:

Part No. Serial No. LK53203 CQDY 241 LK48424 CQDY 242 LK53203 CQDY 257 LK53195 CQDY 309 LK53204 CQDY 428 LK53204 CQDY 657 LK53204 CQDY 678 LK53204 CQDY 697 LK53204 CQDY 773 LK53204 CQDY 951 LK69210 CQDY 1227 LK69210 CQDY 1419

NOTE: Rolls-Royce Limited Service Bulletin RB.211-72-4304, Revision 2, dated June 3, 1977, pertains to this same subject.

(c) In accordance with the provisions of FAR 21.197 and FAR 21.199 the aircraft may be flown to a base where the disc removals required by this AD may be performed.

NOTE: For the purpose of this AD a flight cycle is considered to be an operating sequence consisting of engine starting, takeoff operation, landing and engine shutdown.

This amendment becomes effectiveSeptember 25, 1978.